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The influence of non-cooled exhaust gas recirculation on the indicator diagrams and heat release parameters in diesel engine cylinder

Cisek J.

Combustion Engines

2017

R. 56, nr 4

283--288

This paper presents the results of the diesel engine research on the indicator and heat realized diagrams for VW 1.9 TDI working in 2 modes: with standard, non-cooled EGR system, and without this system. All of measurement was carried out on the some engine speed – 2000 rpm (speed of maximum engine torque) and various engine load. Some of the analyzed parameters were read directly from the measurement systems (e.g. indicator diagrams) or engine controller (e.g. start of injection) and the rest of them had to be calculated. The calculation of rate of heat release (δQ/dα) was based on the well-known mathematical model. When the exhaust gas recirculation valve is open, the maximum of combustion pressure and rate of maximum kinetic heat release (δQk/dα)max are smaller than when the valve is closed. These facts are connected with the shorter self-combustion delay for engine working with EGR. But this is also associated with reduction of the rate of maximum diffusion heat release (δQd/dα)max, which means that more particulates (PM) are excreted into the atmosphere. This fact explains e.g. significantly higher smog of exhaust gases for diesel engine which works with EGR system. The analysis results show that exhaust gas recirculation system slightly deteriorates the energetic parameters of VW 1.9 TDI engine, but, at the same time, significantly reduces the level of toxic nitrogen oxides in exhaust gases.

Simulation and experimental coupled research of rate of heat release in DI diesel engine for various injection strategies

Lejda K., Woś P.

Silniki Spalinowe

2008

R. 47, nr 1

17-24

In the paper the rate of heat release analysis in direct injection diesel engine has been presented and discussed. The research has been carried out for two different injection strategies, i.e. for conventional single-phase injection and for triple-phase injection executed by a Common Rail injection system. The calculation methodology of heat release rate based on indicator diagram has been presented as well.

W artykule dokonano analizy przebiegu wydzielania się ciepła w cylindrze silnika wysokoprężnego z wtryskiem bezpośrednim. Badania prowadzono dla dwu różnych strategii wtrysku, tj. konwencjonalnego wtrysku jednokrotnego potrójnego wtrysku realizowanego za pomocą systemu common rail. Przedstawiono również metodykę obliczania przebiegu wydzielania ciepła na podstawie wykresu indykatorowego.