A simulation analysis of a DI diesel engine fuel injection system fitted with a constant pressure valve

 
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A simulation analysis of a DI diesel engine fuel injection system fitted with a constant pressure valve (EN)

Rakopoulos, CD (EN)
Hountalas, DT (EN)

N/A (EN)

In the present work, a theoretical and computational investigation is conducted to examine the performance of a fuel injection system fitted with a constant pressure valve, used to power a high speed direct injection (DI) diesel engine. The delivery valve (conventional layout) in the fuel injection system of diesel engines is used to provide a residual pressure in the fuel pipeline for the next injection. However, this layout often results in secondary injections which have a serious effect on engine performance. This problem is more severe in the cases of maintaining high residual pressure values. The use of a secondary valve placed inside the delivery valve, called the constant pressure valve, eliminates this problem by relieving the fuel pipe from the high pressure fluctuations caused by the pressure waves reflected at the injector end and the delivery valve chamber. A relevant experimental investigation is conducted with such a fuel injection system on a high speed direct injection diesel engine, examining the effect of load and speed on the performance of the fuel injection system. The experimental results compare well with the theoretical results obtained from a comprehensive simulation model developed by the present authors. Also, results are presented using the simulation model for the same fuel injection system without being fitted with the constant pressure valve, revealing the occurrence of secondary injections at a high engine speed. The simulation model offers very useful information concerning the design of such a fuel injection system and may be used during the development procedure providing economy in time and a better understanding of the entire injection process. (EN)

journalArticle

Fuel injection system (EN)
Diesel engine (EN)
Constant pressure valve (EN)

Εθνικό Μετσόβιο Πολυτεχνείο (EL)
National Technical University of Athens (EN)

Energy Conversion and Management (EN)

1996


PERGAMON-ELSEVIER SCIENCE LTD (EN)



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