Wyniki wyszukiwania - BazTech

1

The impact of a place for the measurement of cylinder pressure of marine piston engine on the indicator diagrams and indicator parameters

Witkowski Kazimierz, Wysocki Jacek

Journal of KONES

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2019

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Vol. 26, No. 2

181--188

EN

The article discusses one of the most popular methods of diagnosing selected damages of marine piston engines, which is the indication or measurement of pressure changes in the engine’s combustion chamber. Improving the quality of indicator diagrams may contribute to the increase in the efficiency of using the parameters indicated in the diagnostics of marine piston engines. Measurement errors during engine indication are primarily caused by measuring channels that connect the combustion chamber to the pressure sensor. One way to avoid these errors is to install the pressure sensor directly in the combustion chamber. It seems that it is possible to eliminate these errors. However, there is a risk that the pressure sensor will be damaged by the effect of high temperature on it during combustion of the fuel-air mixture in the engine’s combustion chamber. The article presents the results of tests that indicate that the measured temperatures in the place where the sensor was installed (in the combustion chamber) did not exceed the critical value specified by the pressure sensor manufacturer. The article also presents the results of cylinder pressure measurement not only in the combustion chamber but also in two other points - on the thread of the indicator cock and in the measuring channel between the indicator cock and the cylinder head. The tests were carried out in a wide range of engine load technically efficient and with simulated damage in the fuel injection system. The article presents a comparative analysis of the parameters read out of the indicator diagram for the three abovementioned pressure measurement locations. It was shown that the pressure measurements carried out directly in the combustion chamber are free from errors resulting from the influence of measuring channels and indicator cock.

2

Pressure measurement in the cylinder of four-stroke marine engine - simulation analysis

Cuper-Przybylska Dominika

Combustion Engines

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2019

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R. 58, nr 2

36--39

EN

The measurement of combustion pressure relies on connecting a pressure sensor to a four-stroke marine engine cylinder by a channel led out from the engine cylinder. The geometry of the channel distorts the results of combustion pressure measurements. The purpose of the work is to create a model of combustion processes in engine cylinders. The model uses a mathematical description of the indicator channel on one of the engine cylinders. The input data to the model and the data necessary for its verification came from the direct measurements on the research facility. The test object was a four-stroke Sulzer 3AL25/30 engine loaded by an electric power generator. During calculations, different diameters and lengths of measurement channel were simulated. The obtained results allowed to formulate the conclusion that the geometry of the measurement channel has a significant impact on the measurement results. The increase of the length of the measuring channel as well as the diameter of the channel causes disturbances in the measurement of the maximum pressure.

3

Diagnostic of malfunction of four stroke marine engine using harmonic components of combustion pressure waveforms

Drewing S., Dereszewski M.

Journal of KONES

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2018

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Vol. 25, No. 2

97--103

EN

The paper presents results of experimental measurements and analysis of combustion pressure and fuel pressure in high-pressure line before fuel valve. The aim of conducted experiments was detection of failures of high-pressure fuel system. Both pressure signals were recorded simultaneously and subsequently processed using FFT decomposition of obtained wavelets. The idea of comparison of both fuel and gas pressures came after observations of occurrence changes of wavelets form of fuel high pressure, probably caused by malfunction of injector's sprayer. The engine from test bed is very well armoured with sensors, what enable observations of fuel and combustion pressure in real time. Unfortunately, such equipment is very unlike in real objects, what created un idea to find out whether run of combustion pressure wavelet reflects fuel pressure deviations and whether is possible to detect such kind of deviations in way of decomposition of indicated pressure wavelet. Experiment was carried out in laboratory of Gdynia Maritime University, using medium speed diesel engine. Simulation of malfunctions of fuel valve was obtained by installation of specially prepared spraying nozzles. All measurements were carried out at reference load of 75% of MCR (Maximum Continuous Rating). In order to get reliable results and avoid errors due to omitting outer atmospheric conditions, registrations were repeated several times, in days characterized by different temperature and atmospheric pressure.

4

The evaluation of the regularity of the combustion process in the SI engine fueled with petrol and ethanol

Stelmasiak Z., Pietras D.

Combustion Engines

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2017

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R. 56, nr 1

94--99

EN

In the paper are presented results of a research work concerning automotive spark ignition engine fueled with ethyl alcohol. The research was performed on a Fiat 1100 MPI engine adapted to dual fuel feeding. Injection of ethyl alcohol was accomplished in area near inlet valve with use of original injectors, the same as used in case of gasoline feeding. The subject-matter of the study was to compare smoothness of engine operation fueled with alcohol in relation to parameters of the engine fueled traditionally with gasoline. There were analyzed combustion parameters calculated on the basis of recorded indicated diagrams of successive individual combustion cycles and averaged diagrams of successive 50 cycles. Performed investigations are pointing at smooth engine operation running on neat alcohol, and on improvement of performance parameters such as effective power and overall efficiency.

5

Wpływ ustawienia kąta wyprzedzenia wtrysku na procesy zachodzące w komorze spalania silnika rolniczego zasilanego biopaliwami

Orliński S.

Logistyka

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2014

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nr 3

4855--4865

PL

W artykule przedstawiono wybrane wyniki badań ciśnienia spalania podczas zasilania silnika doładowanego PERKINS typ 1104C-E44T olejem napędowym (ON) oraz porównawczo estrem z lnianki L-100 i mieszaniną o składzie objętościowym (v/v) L-10 (90% ON+10% estru z lnianki). Badania realizowano przy trzech ustawieniach kątach wyprzedzenia wtrysku paliwa (standardowym oraz wcześniejszym i późniejszym w stosunku do niego). Do badań wykorzystano typowe stanowisko hamowniane z wyposażonym w system pomiarowy parametrów szybkozmiennych pracy silnika. W celu wyznaczenia różnic w procesie spalania w/w paliw w badaniach zastosowano aparaturę pomiarową firmy AVL służącą do kompleksowego wyznaczania parametrów szybkozmiennych ze 100-cykli jego pracy. Zastosowanie paliw o różnych właściwościach fizykochemicznych do silników o zapłonie samoczynnym wymaga dużych dokładności pomiarów parametrów diagnostycznych celem poznania występujących różnic w procesach wtrysku i spalania silników zasilanych tymi paliwami. Spełnianie coraz bardziej rygorystycznych norm w emisji składników toksycznych spalin zmusza współczesnego użytkownika silników spalinowych o zapłonie samoczynnym do posiadania szybkich i precyzyjnych metod oceny jego stanu technicznego, a szczególnie procesu spalania oraz stanu technicznego aparatury wtryskowej Badania wykazały, że rodzaj paliwa o różnych właściwościach fizykochemicznych i różne kąty wyprzedzenia wtrysku paliwa mają istotny wpływ na proces spalania. Wpływ ten przejawia się w oddziaływaniu na zużycie paliwa, na wskaźniki energetyczne, emisję toksycznych składników ze spalinami oraz emisję akustyczną.

EN

In the article chosen research findings of burning the pressure while powering the engine charged up were introduced Perkins 1104C-E44T type with diesel oil (ON) and comparatively with camelina ester L-100 and mixture about volume composition (v/v) L-10 (ON-10%/ camelina ester - 90%). Examinations were being carried out at three placing overtaking the fuel injection in angles (standard and earlier and more late with respect to it). A typical post was used for examinations brakes with equipped with the measuring system of fast-changeable parameters of the work of an engine. In order to outline differences in the process of burning mentioned above fuels in examinations measuring apparatus of the AVL company serving for comprehensive outlining were applied of fast-changeable parameters from 100-cycle of its work. Using fuels about different properties physicochemical to engines about the self-ignition requires the big curacies of the measurements of diagnostic parameters to get to know appearing differences in processes of injection and burning engines out powered with these fuels. Fulfilling rigorous norms more and more in emission of elements of the toxic exhaust fumes is forcing the contemporary user of internal-combustion engines about the self-ignition to have fast and precise methods of estimation of its technical state particularly the process of burning and the technical state of injection apparatus. Examinations demonstrated, that kind of fuel about different properties physicochemical and different angles of overtaking the fuel injection have the essential influence on the process of burning. This influence is showing in the influence to the fuel consumption, for energy signs, the broadcasting of toxic ingredients with the exhaust fumes and acoustic emission.