Wyniki wyszukiwania - Biblioteka Nauki

1

Unrepeatability of the Fuel Injection and Combustion Processes in the Diesel Engine Fuelled with Renewable Fuel

100%

Lotko W.

Advances in Science and Technology. Research Journal

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2020

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tom Vol. 14, no 4

68--77

EN

Despite the fact that more than a hundred years have passed since the first design of the compression ignition (CI) engine appeared, its optimal design has not yet been achieved. It is still the subject of constant modernisation in order to meet the new expectations of users in terms of its dynamics, economy, and, in recent months, also ecology. The most effective fulfillment of these requirements is achieved through new solutions of the fuel supply system and electronic control of injection and combustion processes. The publication includes the test results obtained on the basis of two engines. One of them is the single-cylinder CI engine AVL5402, and the other one – a threecylinder CI engine AD3.152. The first one is equipped with the Common Rail fuel supply system, electronically controlled with the selenoid injector. The second engine has a CAV distributor fuel injection pump and traditional, mechanical controlled injectors. The paper demonstrates how these two different structural systems for supplying and controlling engine parameters affect the selected indicators of the injection and combustion process. The influence of diesel fuel (DF) and rapeseed oil (RO) feeding the engine in both different injection and control systems on the unrepeatibility of the injection pressure on the maximum combustion pressures in the engine cylinder and, consequently, non-uniformity of the crankshaft rotational movement of the engine were also pointed out. The continuation of the research in this area seems to be expedient. They can be supplemented with statistical models of these phenomena. The results obtained in this way could be helpful in optimising the design of power supply systems and engine combustion chambers.

2

The Impact of Rapeseed Oil Methyl Esters on Fuel Injection Parameters in a Diesel Engine Equipped with the Common Rail Injection System

100%

Lotko W.

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tom Vol. 15, no 3

76--87

EN

In the global fuel economy, new challenges concerning the use of alternative (vegetable) fuels in the internal combustion engines are starting to arise. The important issue is to meet the new limits on four main pollutant emissions from a diesel engines: CO (carbon monoxide), NOx (nitrogen oxides), HC (hydrocarbons) and PM (particulate matter). The design of a modern engine must be characterized by high efficiency, its dynamics of movement and durability. Dynamic development of plant fuels is forced by the new strategy of the global fight against the global warming. For these reasons, it is necessary to do research concerning the effects of the use of biofuels, including methyl esters, higher fatty acids of rapeseed oil for self- ignition engines. The current tests must concern the engines equipped with the latest Common Rail fuel injection systems. In the publication, the above-mentioned issues have been analyzed, and the results of tests of the basic injection process parameters have been presented. The AVL5402 engine was fueled with mixtures of diesel oil with RME ester of rapeseed oil produced by ORLEN Południe S.A. in Trzebinia. The impact of the fuel (v/v) RME content in the mixture with diesel oil on the injection process parameters such as: initial velocity of the injected fuel, critical speed of secondary fuel breakup, critical droplet diameter, microstructure of the fuel stream, droplet Sauter mean diameter, vertical angle of the fuel stream, have been justified. The impact of the fuel (v/v) RME content in the mixture with diesel oil on the above-mentioned parameters has been proved. During the tests, the engine worked on the load characteristics.

3

Computer-aided diagnostics of injection and combustion processes in engines equipped with Common Rail fuel injection

100%

Lotko W.

Diagnostyka

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2022

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tom Vol. 23, No. 4

art. no. 2022407

EN

In earlier designs, the compression-ignition engine units were controlled by means of mechanical elements. They were levers, rods, springs, pawls, cams and others. The quality of such control did not ensure the required repeatability of control parameters in the fuel injection and combustion process. After the introduction of the standards limiting engine emissions of the limited exhaust components, the aforementioned engine control systems were not able to meet the requirements. The mechanical regulation of mechanical systems has been replaced by electronic control systems. It was the development of computer techniques and software that enabled design solutions of control systems for injection and combustion process parameters in engines with sufficient accuracy and repeatability of test results. The modern EDC (Electronic Diesel Control) control system, due to the computing power of microprocessors increased in recent years, enables meeting high requirements of modern Common Rail injection systems. The article presents issues in the area of four thematic levels: the design and modernization of the engine, its operation, diagnostic problems in order to determine reasons of unit failures and bench-top methods for assessing the effectiveness of unit repairs as well as issues concerning alternative fuels.

4

Metoda pośredniego określania luzów zaworowych w silnikach o zapłonie iskrowym

63%

Lotko W. , Lechowski M.

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tom R. 22, nr 12

2003--2005, CD

PL

W artykule przedstawiono diagnostyczną metodę pośredniego określenia luzów zaworowych w silnikach o zapłonie iskrowym za pomocą pomiarów napięcia samoindukcji obwodu pierwotnego cewki zapłonowej lub interpretacji mierzonego bezwzględnego ciśnienia powietrza w kolektorze dolotowym. Ta metoda umożliwia, po spełnieniu warunków koniecznych, określenie czy wymagana jest regulacja luzów zaworowych.

EN

This paper presents a diagnostic procedure for indirect determining valve clearance in spark-ignition engines by measuring the voltage of self-induction of the primary circuit of the ignition coil or interpret the measured absolute air pressure in manifold. This procedure determines, after fulfilling the necessary condi-tions, the need to adjust the valve clearance.

5

Ocena wpływu dodatku biowęglowodorów w paliwie na wybrane parametry procesu spalania w silniku o zapłonie samoczynnym

63%

Lotko W. , Łodygowski K.

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tom R. 20, nr 1-2

309--312

PL

W artykule omówiony został wpływ dodatku biowęglowodorów na wybrane parametry spalania silnika o zapłonie samoczynnym. Badania wykazały, że syntetyczny olej napędowy może być wykorzystywany jako dodatek do mineralnego oleju napędowego. Proces spalania takich mieszanin zależy od ich składu. Użycie SYNON prowadzi do zwiększenia prędkości narastania ciśnienia w komorze spalania.

EN

The paper presents test results carried out with using of CI engine fuelled with diesel oil and synthetic fuels. Research results show that SYNON be used in diesel fuel. Combustion proces of such fuel blends depend on mixture composition. Using of SYNON in mixture with diesel oil follows to increase a value of maximium pressure rise in cumbustion chamber.

6

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

51%

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.

7

Badanie wpływu mikroemulsji wodno-paliwowych na okres zwłoki samozapłonu w silniku o zapłonie samoczynnym

51%

Lotko W. , Longwic R. , Górska M.

Przemysł Chemiczny

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2019

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tom T. 98, nr 6

924--927

PL

Przedstawiono wyniki badań dotyczących wpływu wody zdyspergowanej w mikroemulsji paliwowej na zmianę okresu jej samozapłonu. Określono wybrane właściwości fizyczno-chemiczne oleju napędowego (ON) oraz testowanych mikroemulsji zawierających 4 lub 8% mas. wody destylowanej. Paliwa te wykorzystano do zasilenia silnika badawczego firmy AVL. Wyniki potwierdziły, że obydwie testowane mikroemulsje wodno-paliwowe charakteryzowały się mniejszą skłonnością do samozapłonu niż ON.

EN

Gas oil and its aq. microemulsions (4 and 8% by mass) were tested as fuel in diesel engine. Both tested microemulsions had lower ability for self-ignition than the gas oil. Selected phys.-chem. properties of tested fuels were detd.

8

Analiza przyczyn uszkodzeń turbosprężarek samochodowych

45%

Lotko W. , Longwic R. , Górski K. , Sander P. , Durczak T.

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tom R. 22, nr 12

1833-1836, CD

PL

W artykule przedstawiono analizę przyczyn uszkodzeń turbosprężarek samochodowych. Opisano i omówiono najczęściej występujące w eksploatacji uszkodzenia turbosprężarek. Bazowano na danych zebranych z praktyki reklamacyjnej i szkoleniowej wiodącej na rynku firmy zajmującej się regeneracją turbosprężarek.

EN

The article presents an analysis of the causes of damage to automotive turbochargers. Described and discussed the most common in use damage to the turbocharger. It was based on data collected from practice complaint and training market leading regenerator turbochargers.

9

Samozapłon mieszanin oleju rzepakowego z n-heksanem w silniku o zapłonie samoczynnym

38%

Longwic R. , Sandera P. , Lotko W. , Górski K. , Jańczuk B. , Zdziennicka A. , Szymczyk K.

Przemysł Chemiczny

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2020

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tom T. 99, nr 2

206--210

PL

Przedstawiono wyniki badań obrazujące wpływ zawartości n-heksanu w mieszaninie z olejem rzepakowym na zwłokę samozapłonu tego paliwa w silniku o zapłonie samoczynnym. Zamieszczono wybrane właściwości fizykochemiczne oleju napędowego (ON) oraz testowanych mieszanin zawierających 10 oraz 15% obj. n-heksanu. Paliwa te wykorzystano do zasilania silnika badawczego zamontowanego w samochodzie marki Fiat Qubo. Przeprowadzone badania były kontynuacją badań wstępnych wykonanych na hamowni silnikowej, w których obiektem badań był silnik AD3.152 zasilany olejem rzepakowym z dodatkiem n-heksanu. Uzyskane wyniki potwierdziły, że obie testowane mieszaniny oleju rzepakowego z n-heksanem charakteryzowały się gorszą skłonnością do samozapłonu w stosunku do ON, co było związane bezpośrednio z ich odmiennymi właściwościami fizykochemicznymi.

EN

Mixts. of rapeseed oil with n-C6H14 (10 and 15% by vol.) were tested in diesel engine for applicability as motor fuels. The results were compared with data for gas oil. Self-ignition delay angle was higher than for gas oil and increased with increasing n-C6H14 content in the mixt. The kinetic combustion phase disappeared when the mixt. was used as the fuel.