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Analysis of the structure of the atomized fuel spray with marine diesel engine injector in the early stage of injection

Grochowalska Joanna, Jaworski Piotr, Kapusta Łukasz Jan

Combustion Engines

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2023

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R. 62, nr 4

97--103

EN

This paper presents the results of the experimental research of the atomized fuel spray with the marine diesel engine injector in the constant volume chamber. The specificity of the phenomena occurring in the marine engine cylinder was the reason to use the optical visualisation method in the studies - the Mie scattering technique. This work presents an analysis of the influence of different geometry of outlet orifice and opening pressures of marine diesel injector on the macrostructure of the fuel spray. In the results, it was observed that the increased L/D ratio of the outlet orifice of the injector caused: an increase in the spray cone angle and a decrease in the spray tip penetration in the early stage of injection. Furthermore, it was defined that the characteristic of spray tip penetration over time was power, whereas the spray cone angle over time was a logarithmic function.

2

Analysis of the macrostructure of the fuel spray atomized with marine engine injector

Grochowalska Joanna

Combustion Engines

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2019

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R. 58, nr 4

80--85

EN

One of the main problem influencing the combustion process in the cylinder of the marine engine is an fuel spray phenomena. The parameters describing the shape of the fuel spray are named macro parameters. This article presents the research results of the macrostructure parameters of the fuel spray atomized with the marine engine injector. The research were carried out by optical visualization measurement method of Mie scattering. The diameter of nozzle injector was 0.375 mm and L/D coefficient 8.3. In these research were considered different parameters of injection opening pressures and backpressures in the constant volume chamber. Generally conlusions are: the opening pressure influence on maximum spray tip penetration, spray cone angle and influence on speed of the injected fuel. The increase of backpressure into the constant volume chamber causes the reduction of spray tip penetration and the increase of the spray cone angle.

3

Analiza wpływu ciśnienia wtrysku w układzie common rail na zasięg strugi wybranych paliw zastępczych

Jaworski A., Kuszewski H., Lejda K., Ustrzycki A., Woś P.

Combustion Engines

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2013

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R. 52, nr 3

618--624

PL

W artykule przedstawiono badania wpływu ciśnienia wtrysku na zasięg strugi paliwa dla wybranych paliw takich jak olej napędowy, biodiesel, olej rzepakowy oraz ich mieszaniny. Badania realizowano na specjalnie opracowanym stanowisku z układem zasilania typu Common Rail, przy wtrysku do komory wypełnionej badanym paliwem. Badania prowadzono dla różnych ciśnień w zasobniku, a do wyznaczenia zasięgu strugi użyto systemu VisioScope firmy AVL. Zasięg strugi określano na podstawie zarejestrowanych przebiegów w funkcji kąta obrotu wałka pompy wysokiego ciśnienia.

EN

This article presents the research results of influence of injection pressure on the spray tip penetration of selected fuels such as diesel, biodiesel, rapeseed oil and mixtures of these fuels. The study was performed on a specially developed test stand with a Common Rail injection system, and at fuel injected into the chamber filled with research fuel. The study was made for a different pressures in the rail; for determination of spray tip penetration the AVL VisioScope system was used. The results was determined on the base of recorded pictures of injected fuel stream as a function of rotation angle of the high pressure pump shaft.