Wyniki wyszukiwania - Biblioteka Nauki

1

The use of laser equipment to optimize the operating parameters of the fuel injector of combustion engine

100%

Kowalski M. , Jankowski A.

Journal of KONES

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2018

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tom Vol. 25, No. 4

199--206

EN

The conducted tests were aimed at determination of the drop diameters and shaping of the velocity field at different configurations of the test injector. The test results allowed defining the relationship between the injector configuration and the distribution of velocities and dimensions of drops in the fuel stream. The effect of the fuel viscosity and injection pressure on the dimensions of fuel drop diameters and the distribution of the velocity field of drops in the stream were tested. The tests were carried out on a special test rig with a fixed volume chamber. The measurements were carried out with the use of laser Doppler measurement systems (PDPA, LDV). The tests were conducted for seven different fuel types varying in viscosity and surface tension. In addition, the injection pressure from 50 MPa to 130 MPa was applied. The test results allowed determining the relationship between the injector structure configuration, fuel types and fuel additives, and the distribution of velocity and an atomisation spectrum of drops in the fuel stream, and the air impact on the fuel stream.

2

The effect of length of high pressure pipes on injection process in common rail system of diesel engine

100%

Ustrzycki A. , Kuszewski H. , Woś P.

Journal of KONES

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2010

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tom Vol. 17, No. 3

477-482

EN

The storage supply systems of Common Rail type are characterized by high possibilities in shaping the rate of injection. The possibility to implement multi-injection at high pressure, easiness of adapting the system to the engine, relatively easiness of compensation the arrangement of injector parameters resulting from work tolerance, as well as easiness of making changes in the electronic engine controller enabling the production of engines with various performances, cause that type of these solutions currently are widely used injection systems in diesel engines. Injection system should be characterized above all by high precision fuel dosing into engine cylinders, the accuracy in starts controlling of individual phase of injection, repeatability and reliability and durability, as well as the up keep of these parameters for long time during operating duration. Fuel injection system works in difficult conditions resulting from high pressure, vibrations, electromagnetic interference affecting electronic executive systems and high temperatures. Especially the injector and injection pipes are open to high temperatures. The dimensions of used elements are also important. The article presents selected results concerning the effect of the length of high-pressure pipes on injection process parameters such as fuel amount, overflow in injector, and the fuel pressure course in injection pipe in front of electromagnetic injector socket. The study was conducted with test stand with electronic measurement system of fuel amount. The tests were made at different pressures in the rail and for different durations of the injector opening.

3

Effect Of Supply Voltage On The Dosage Fuel In Injection System The Common Rail Type

100%

Lejda K. , Ustrzycki A.

Journal of Polish CIMAC

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2009

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tom Vol. 4, no 2

169-176

EN

Common Rail systems are most frequently used solution to the fuel supply system of Diesel engines. This is due to their high potential to shape the characteristics of fuel injection. One of the important requirements for each injection system is precision dose control and its onset, that is, as a consequence of the start of the combustion process. The most important parameters affecting the accuracy of dosing injection systems are, of course injection time, pressure of fuel in the rail and the fuel temperature. Influence on the size of the dose but also other factors, which include the supply voltage, which may be subject to significant change during the start-up of engine. The issue of start-up is becoming of interest to EURO standards, as the processes occurring in the course have a significant impact on the level of pollutants in the exhaust of internal combustion engine. Increased in this period, emissions of toxic compounds results from the unstable processes in the engine cylinder, as well as dynamic changes in the parameters of injection and in the start-up system, in particular, changes in voltage resulting from a large collection of current from the battery. Thus, the article attempted to determine the impact of voltage supply on the dosage of fuel in different operation conditions of the injection system. In particular attention was paid to the size of the dose and the actual changes at the beginning of fuel injection voltage changes. The study was conducted on a test stand, which were the main components of the test bench Bosch EPS-815 with electronic measurement of fuel dose and the visualization system AVL Visioscope. Control of the injector was performed using the self-developed controller.

4

Determination of general efficiency of spark ignition engine with stratified charge with direct fuel injection

100%

Sendyka B. , Cygnar M.

Journal of KONES

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2005

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tom Vol. 12, No. 1-2

323-328

EN

Designers of gasoline engines are faced with higher and higher requirements as regards ecological problems and increase in engine efficiency at a simultaneous decrease in fuel consumption. Satisfaction of these requirements is possible due to recognition of the phenomena occurring inside the engine cylinder, choice of suitable optimal parameters of the fuel injection process, and determination of geometrical shapes of the combustion chamber and piston head. The paper presents analysis of increasing in general efficiency of a GDI (Gasoline Direct Injection) engine in dependence on the quality of the stratified mixture and range of loading. For determination of total efficiency of a Gasoline Direct Injection engine test bed investigations were carried out with the aim to determinate the speed and load characteristics of the investigated engine on these basis the total efficiency of a GDI engine can be determined.

5

A new fuel-injection mechatronic control method for direct-injection internal combustion engines

100%

Tutaj J. , Fijałkowski B.

Acta Mechanica et Automatica

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2018

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tom Vol. 12, no. 4

276--280

EN

In this paper, a novel fuel-injection mechatronic control method and system for direct injection (DI) internal combustion engines (ICE) is proposed. This method and system is based on the energy saving in a capacitance using DC-DC converter, giving a very fast ON state of the fuel injectors’ electro-magnetic fluidical valves without an application of the initial load current. A fuel-injection controller for the DI ICEs that provides a very short rising time of an electromagnet-winding current in an initial ON state of the fuel-injector’s electromagnetic fluidical valves, which improves a fuel-injection controller reliability and simplify its construction, is presented. Due to a number of advantages of afore -mentioned fuel-injection mechatronic control method and system, it may be utilised for the DI ICEs with fuel injectors dedicated to all types of liquid and/or gas fuels, for example, gasoline, diesel-oil, alkohol, LPG and NPG.

6

Comparative study of fuel injection at common rail system using different types of fuel

100%

Ustrzycki A. , Kuszewski H.

Journal of KONES

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2011

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tom Vol. 18, No. 3

493-498

EN

In recent years the use of alternative fuels based, among other things, on vegetable oil is causing increasing concern, which is also observed in our country. Such fuels have different physical and chemical properties (especially viscosity) with reference to the standard diesel fuel. Therefore it is important to know the effect of the additive of biocomponents on fuel injection process, in particular of its parameters, which play an important role in the combustion process and formation of pollutions in exhaust gases. In the paper is presented the test results of selected parameters of the injection process executing by four different electromagnetically controlled injectors using diesel fuel without the biocomponents and mixtures of such fuel with esters of rapeseed oil (FAME). Investigations were carried out on a specially prepared test stand which enables the measurement of fuel delivery and fuel returning from the injector together with its density and temperature. Additionally, beside mentioned parameters, there were recorded high-speed courses of pressure in the high-pressure pipe behind the rail and before the injector. Next, using a system of AVL Visioscope, the fuel injection into the visualization chamber filled with fuel was recorded. It determined the basic parameters of the fuel spray. The aim of this study was to determine the impact of fuel type on the injection process executed by the injectors with different constructional parameters.

7

The influence of diesel oil improvers on indices of atomisation and combustion in high-efficiency engines

88%

Pielecha I. , Pielecha J. , Skowron M. , Mazanek A.

Polish Maritime Research

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2017

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tom nr 3

99--105

EN

The process of fuel combustion in a diesel engine is determined by factors existing during liquid fuel injection and atomisation. The physicochemical properties of the fuel to a large extent decide upon the quality of this phase of cylinder fuelling. So it is important to ensure appropriate properties of a fuel affecting its atomisation and, as a result, combustion. The paper deals with the topic of diesel oil improvers and the analysis of their influence on atomisation and combustion indices. In the studies base diesel oil and a diesel fuel improved by a package of additives, were used. The process of conventional and improved fuel injection was analysed by using optical examinations. The amount of released heat was evaluated during the studies carried out on combustion. Significant aspects of the applied improvers in relation to fuel injection and its combustion have been indicated.

8

New diagnostic methods of alternative LPG/CNG injection systems

88%

Flekiewicz B. , Flekiewicz M.

Journal of KONES

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2009

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tom Vol. 16, No. 2

109-116

EN

Diagnostic methods of gas alternative feeding systems were presented in this paper. Methods of validation for properly cooperation between OEM petrol systems and gas injection system were described. Procedures allowing the analysis ofproper operation of both petrol and alternative feeding systems were presented. A detailed study has been done on seąuential injection system, as a solution fulfilling restricted requirements of new SI engines. Obtaining both satisfactory emission reduction level and minimal power drop for alternative engine gas operating is only possible with all diagnostic procedures especially ones connected with system prototyping phase being done with high precision equipment characterized by low inertia of transducers. Sensors output signals reąuire acquisition with the use of more complex and faster systems. Proper choice of test equipment at each step, guarantees repeatability and what results also reliability ofrealized diagnostic procedures. Influence of alternative gas fuelling systems on mixture adaptation, transfer function, diagnostic methods for prototyping phase, diagnostic procedures for alternatively powered vehicle operation, diagnosis of sequential gas injection system during normal system maintenance are presented in the paper.

9

Computational modelling of the fuel injection and combustion in a Diesel K6 rotary engine

88%

Mason M. , Wyszyński M. L. , Jordan O. , Gibson D.

Journal of KONES

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2018

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tom Vol. 25, No. 4

263--276

EN

This paper outlines the methods and results of computations completed using the ANSYS Fluent code modelling the fuel injection and combustion within the K6 engine, a new form of rotary engine in which the fuel is injected in an arc across the top of the cylinder. The model uses the DPM Model in conjunction with a dynamic mesh and non-premixed combustion models to treat the injection as liquid diesel evaporating to C12H23. The outcomes of this model are presented in images displaying the distribution of temperature, and fuel and CO2 concentrations. The limitations pertaining to the maximum injection angles are also studied. The simulation is found to be effective and the results suggestive of successful, clean and complete combustion while presenting some matters, which require further investigation. The article presents temperature within the combustion chamber at various crank angle degrees, ) velocity of fluid within the combustion chamber, effects of impingement with injector offset on temperature and fuel concentration, fuel concentration demonstrating impingement, in cylinder temperature curve.

10

Experimental research on influence of the fuel nozzle geometry on the fuel consumption of the marine 4-stroke diesel engine

88%

Kowalski J. , Nagórski J. , Sikora G.

Journal of KONES

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2018

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tom Vol. 25, No. 2

185--190

EN

The article presents experimental research that has been carried out on a marine, 4-stroke, 3-cylinder, turbocharged engine. During testing, the engine operated at a constant rotational speed of 750 rpm and a load from 0 kW to 280 kW. The engine was fuelled by diesel oil of known specification and loaded by electric generator with water resistance. The fuel consumption was measured during the engine operation with fuel nozzles with different geometries. The measurement of the fuel consumption was carried out using a weighing system that was designed, constructed, and manufactured by the “KAIZEN” scientific research team at the Faculty of Mechanical Engineering at the Gdynia Maritime University. The results of measurements show changes in the fuel consumption by the engine with the geometry of the injected fuel spray. The research facility is Sulzer’s 3- cylinder, 4-stroke, turbocharged AL25/30 piston engine. The fuel system consists of Bosch injection pumps controlled by a rotation speed regulator. Fuel injectors are centrally located in the cylinder heads of the engine.

11

Comparison of characteristics of spark pług engines FSI, TSI/TFSI type of Volkswagen Company

88%

Miksiewicz K. , Tkaczyk M. , Rymarowicz M.

Journal of KONES

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2010

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tom Vol. 17, No. 4

337-343

EN

The use of direct injection in spark ignition engines significantly facilitated the use of chargers in these engines. This resulted lately in the significant popularization of direct injection engines, initially freely sucking and in final result turbocharged. The greatest popularity on the market gained engines of Volkswagen Company, named FSI and TFSI / TSI. Application of Common Rail systems allowed not only improving the characteristics of the engine by increasing the accuracy in dispensing fuel into individual cylinders. The most important gain is the possibility ofsecond injection of the fuel to the cylinder after the intake valve is closed. On the one hand it allows better control of the load in the cylinder, at first with the piston crown, and now with shaping the injection by the injector. On the other hand it allows creating a stratified mixture, at low load of the engine it reduces fuel consumption and work at high excess air ratios lambda Quickly it began to use the turbocharger in those engines due to the significant improvement in the operating characteristics of such engine. Profit from better filling of the combustion chamber can be used in different ways. On the one hand, you can replace engines naturally aspirated, with turbocharged with lower displacement, which leads to the improvement of the economics of such engine. On the other hand, after appropriate modifications to the design, you can add a charger to the naturally aspirated engine, retaining its capacity. Gains are then not only higher operating parameters, such as power and torque, but it also significantly improves the torque curve. It has big impact on the flexibility of the engine and the vehicle which is powered by it. Another gain is larger amount of work done by the engine.

12

Environmental Aspects of a Common Rail Diesel Engine Fuelled with Biodiesel/Diesel Blends

88%

Lotko W. , Smigins R. , Tziourtzioumis D. , Górska M.

Advances in Science and Technology. Research Journal

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2022

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tom Vol. 16, no 5

192--201

EN

The purpose of the study was the research concerning the emissions of limited exhaust gas components of the AVL research engine equipped with Common Rail injection system, fuelled with different biodiesel blends and diesel fuel as reference. In details, the engine was powered with mixtures of rapeseed methyl esters (RME) with DF in the volumetric ratios of 10:90, 20:80, 30:70, 40:60 and 50:50. The tests were performed at: 1200, 1700 and 2200 rpm and the torque T = 5…35 Nm (step 5 Nm). The analysis of the obtained results showed that the emissions of hydrocarbons (HC) from the tested engine fuelled with biodiesel are lower than that of diesel fuel. Carbon monoxide (CO) emissions are also lower, except for low rotational speeds and low engine load T = 5…20 Nm. As for nitrogen oxides (NOx) emissions, it is also lower than that for the diesel fuel, except for high engine loads, in the range above 25 Nm, for each rotation speed of the engine load characteristics. Moreover, in this research it was confirmed that emission of particulate matter (PM) is also slightly reduced for the engine fuelled with tested blends.

13

Effect of the fuel injection pressure on the combustion process in a PFI boosted spark-ignition engine

88%

Merola S. S. , Sementa P. , Tornatore C. , Vaglieco B. M.

Journal of KONES

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2008

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tom Vol. 15, No. 4

341-349

EN

In this paper, low-cost solutions were proposed to reduce the fuel consumption in a boosted port fuel injection spark ignition (PFI SI) engine, taking into account the engine performances and the pollutants emission. To this purpose, the optical characterization of the fuel injection and of the combustion process was carried out in a PFI SI engine. The experiments were performed on a partially transparent single-cylinder SI engine, equipped with a four-valve head and an external boost device. The intake manifold was optically accessible through three holes that allowed the introduction of an endoscope and of optical fibres. The standard injection condition planned by the engine manufacturer was investigated; it consisted in the fuel injection at 3.5 bar when the intake valves were closed. Moreover, the fuel injection with open intake valves was tested; 3.5 and 6.5 bar fuel pressures were studied for open and closed valves conditions. Optical techniques based on 2D-digital imaging were used to follow the fuel injection spray in the intake manifold and the flame propagation in the combustion chamber. The results of in-cylinder optical investigations were correlated with the engine performances and with the exhaust emissions.

14

Some problems using of vegetable fuels in diesel engines

88%

Ambrozik A. , Jankowski A. , Slezak M.

Journal of KONES

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2006

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tom Vol. 13, No. 4

487-496

EN

Experimental results of the four-stroke CI direct injection engine fed with vegetable fuel - methyl esters of the rapeseed oil in aspect pressure course and heat release are presented in the paper. Aim realized researches was estimation of the influence feed of the CI engine a vegetable fuel on performance of the CI engine mainly in an aspect of the heat release. This influence estimated on the basis of engine research on dynamometer test bench with additional high-frequency measurement of the pressure in the combustion chamber and the feed system and lift of nozzle needle. In estimation works there were performed: the analysis change route of increasing of the pressure in the injection pipeline of the engine feed system and as result of appointment of relative characteristics of the heat release quantity during combustion process. This analysis realized basing on average values of 100 engine work cycles received from experimental measurement on engine dynamometer test bench. Characteristics of the relative heat release quantity during combustion process were appointed basing on the analysis of 100 engine work cycles received from experimental indicator diagrams. Indicator diagrams were obtained at work of the engine according to the external speed engine characteristics. The analysis of indicator diagrams of the engine oriented on to calculating characteristics of the heat release was realized at the regard of the change composition and the working charge quantity of kilo mole during combustion process and at neglect of losses of heat caused with the dissociation combustion products. The quantity heat exchanged between the working charge and walls combustion chamber was appointed basing on the empirical dependence for coefficient proposed by Woschni. Test results indicate the two-phase- course of combustion process. The speed of the heat release concerning combustion of vegetable fuel is greater comparatively for this speed concerning the diesel oil. Initial values of speed jet of injected fuel, the drop break-up terms and the spray ranges were comparable for both fuels. These proprieties have an essential influence on performances of the engine.

15

The Influence Of Mutual Angle Position Of Main, Pilot And Preinjection Dose On Fuel Dosing In Common Rail System

88%

Balawender K. , Kuszewski H. , Lejda K. , Ustrzycki A.

Journal of Polish CIMAC

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2008

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tom Vol. 3, no 1

9-13

EN

The common rail fuel supply systems on account of flexibility at injection characteristic shaping, are the most frequently applied fuel supply solution in Diesel engines. The most essential parameters, which have the effect on fuel dosing precision are injection duration, rail pressure and fuel temperature. Also there are other factors, which can cause fuel dosing errors. It might be also other factors caused by specific working of fuel system. The split of fuel dose into a few parts (for example into pilot dose, preinjection dose and main dose) can cause pressure fluctuation in rail and also in the whole system. Next this can cause a chang of set fuel dose. In the article research results connected with influence of mutual angle position of main, pilot and preinjection dose on the total fuel dose. The researches were conducted with test stand equipped with test bench Bosch EPS-815 with electronic measuring of fuel dose. Control of injector was realized by using worked out controller which enables to split of fuel dose into three parts.

16

Initiation of damage to the hot part of aircraft turbine engines

75%

Szczepankowski A. , Szymczak J.

Prace Naukowe Instytutu Technicznego Wojsk Lotniczych

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2016

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tom nr 38

61--74

EN

In the paper, the initiation causes of damage to flame tubes of a basic combustion chamber and turbine units, which are the most common in the operation process of aircraft turbine engines (ATE), were presented. They were illustrated with the use of numerous examples of progressing degradation of the surface condition of parts and components of various types of aircraft engines which was found during endoscopic controls. On the basis of the systematic observation results, the process of destruction of the turbine rotor ring blades’ surface was discussed. The attention was paid to the current and still valid evaluation of the aircraft turbine engine’s suitability for further operation, taking into account the specifics of its use.

17

Wieloczęściowy wtrysk i rozpylenie paliwa przez dwa kątowo umieszczone wtryskiwacze w układzie bezpośredniego wtrysku benzyny

75%

Pielecha I. , Borowski P.

TTS Technika Transportu Szynowego

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2013

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tom R. 20, nr 10

1271--1278, CD

PL

W artykule przedstawiono wyniki badań dotyczących zastosowania dwóch wtryskiwaczy benzyny umieszczonych bezpośrednio w komorze spalania. Zastosowanie takiego układu wtrysku paliwa pozwala na skrócenie czasu rozpylenia paliwa, zwiększając jednocześnie obszar zajmowany przez strugi wtryskiwanego paliwa. Przedstawiono wtrysk jednoczesny oraz wtrysk sekwencyjny realizowany przez dwa wtryskiwacze. Określono korzyści wynikające z takiego rozwiązania przedstawiając wskaźniki geometryczne strug wtryskiwanego paliwa.

EN

The paper presents the results of research about using of two gasoline injectors positioned directly in combustion chamber. The use of this fuel injection system allows to shorten time of fuel spray and area occupied by two fuel doses. Simultaneous injection and sequential carried out by two injectors injection were presented. The benefits resulting from the application of this system showing geometric indicators are identified.

18

Odwzorowanie procesu wtrysku paliwa w sygnale drganiowym silnika o zapłonie samoczynnym

75%

Czechyra B.

Diagnostyka

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2008

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tom nr 4(48)

149-152

PL

W artykule przedstawiono wyniki badań nad możliwością detekcji oraz stopniem odwzorowania procesu wtrysku paliwa w silniku o zapłonie samoczynnym. Przedstawiono genezą tematu i metodykę badań realizowanych na jednocylindrowym silniku badawczym. Wyniki badań laboratoryjnych zweryfikowano na wielocylindrowym silniku kolejowym. W podsumowaniu przedstawiono możliwości wykorzystania uzyskanych wyników badań do detekcji niesprawności wtryskiwacza paliwa silnika 2112SSF.

EN

The article presents some results of the research on possibilities of use a vibration signal of diesel engine in order to detect and describe a fuel injection process. This paper includes a genesis of this problem and a methodology of performed tests, which were executed on one-piston laboratory tests engine. Author presents also the verification results, executed on multi-pistons locomotive diesel engine. As a conclusion, the possibilities of implementation of this method are described, for example to perform an injector fault detection on the locomotive diesel engine.

19

The influence of the time break of the fuel divided dose on the work parameters of the injector common rail system

75%

Stelmasiak Z. , Knefel T. , Larisch J.

Silniki Spalinowe

|

2007

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tom R. 46, nr SC2

173-180

EN

Results of concerning some problems connected with the selection of the divided dose of injection, resulting from differences between electric parameters set on the CR controller with the real division of the injection dose realized through CR injectors were introduced in the paper. The problem of the fuel dose division in the time of engine examinations has been causing certain problems in the assessment of the fuel consumption of the research engine. It is determining bigger problem during verification of models of burning processes with the multi-phase injection dose. One should take this problem into consideration during selection of CR injectors for future applications of a research engine. The preliminary research of delay time between two-stage doses of injection on the impact of changes injection parameters and comparison in this area between the first and the second generation of CR injectors was an aim of the this work.

20

Charakterystyki wydzielania ciepła silnika z wieloetapowym wtryskiem paliwa

75%

Ambrozik A. , Ambrozik T. , Kurczyński D. , Jakóbiec J. , Łagowski P.

Autobusy : technika, eksploatacja, systemy transportowe

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2011

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tom R. 12, nr 12

33-42

PL

Celem artykułu jest analiza i ocena wpływu wieloetapowego wtrysku paliwa na charakterystyki wydzielania ciepła podczas procesu spalania w silniku 1.3 Multijet zasilanym olejem napędowym. Analizie poddano rzeczywiste wykresy indykatorowe sporządzone przy pracy silnika wg zewnętrznej charakterystyki prędkościowej w zakresie prędkości obrotowej wału korbowego silnika od 1000 do 4600 obr/min. Charakterystyki wydzielania ciepła sporządzono przy pomocy programu INDY-2 opracowanego w Zakładzie Silników Cieplnych Katedry Mechaniki. Program ten umożliwia wyznaczanie charakterystyk wydzielania ciepła przy założeniu, że proces spalania zakończył się do otwarcia zaworu wylotowego oraz, że całkowita wartość względnej ilości wydzielonego ciepła podczas całkowitego i zupełnego procesu spalenia jest równa x=xi+xstr=1. Obliczenia realizowano od otwarcia zaworu wylotowego w kierunku początku procesu spalania. Obliczenia wykonane wg powyższego programu uwzględniają zmianę ilości produktów spalania w czasie jego trwania, ciepła właściwego zależnego od składu i temperatury czynnika roboczego oraz straty ciepła powodowane wymianą ciepła pomiędzy czynnikiem roboczym a ściankami przestrzeni, w której zachodzi proces spalania jak też inne jego straty powodowane, np. dysocjacją, niezupełnością i niecałkowitością spalania itp.

EN

The paper aims at analysing and assessing the impact of multistage fuel injection on heat release analysis of the combustion process in the 1.3 Multijet engine fuelled with diesel oil. The analysis was performed on real indicator diagrams taken for the engine working at the external speed characteristics at the crankshaft rotational speed ranging from 1000 to 4600 rpm. Heat release analysis was carried out with the INDY-2 software designed at the Division of Heat Engines of the Mechanics Department. The software performs heat release analysis for the following conditions: the combustion process has been completed by the time the exhaust valve opens, and also the total value of the relative amount of the heat released during the full and complete combustion process is equal to x=xi+xstr=1. Computations are performed until the opening of the exhaust valve, in the direction towards the start of combustion. The computations made by the INDY2 software take into account changes in the amount of combustion products during the process, changes in specific heats which are dependent on the composition and temperature of the working medium, and also heat losses caused by heat transfer from the working medium to the walls of the processencompassing area, and others caused by, e.g., dissociation, incomplete combustion, etc.