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research-article

A detailed study of the effects of biodiesel addition and EGR on diesel engine PCCI combustion, performance and emission characteristics by KIVA-CHEMKIN coupling

[+] Author and Article Information
Alborz Zehni

PhD student, Department of Mechanical Engineering, University of Sahand, Sahand new town, 51335-1996, Iran
a_zehni@sut.ac.ir

Rahim Khoshbakhti Saray

Associate professor, Department of Mechanical Engineering, University of Sahand, Sahand new town, 51335-1996, Iran
khoshbakhti@sut.ac.ir

Elaheh Neshat

Assistant professor, Department of Mechanical Engineering, University of Sahand, Sahand new town, 51335-1996, Iran
e_neshat@sut.ac.ir

1Corresponding author.

ASME doi:10.1115/1.4038456 History: Received November 28, 2016; Revised August 28, 2017

Abstract

In this study, a numerical study is performed by KIVA-CHEMKIN code to investigate the effects of biodiesel addition and exhaust gas recirculation (EGR) on diesel engine PCCI combustion, performance and emission characteristics. The studies are performed for neat diesel fuel and mixture of 10 to 40% biodiesel addition at 67%, 50% and 40% EGR. For this purpose, a multi-chemistry surrogate mechanism using methyl decanoate (MD) and methyl-9-decenoate (MD9D) is used. The main innovation of the present work is analyzing the chemical, thermodynamic and dilution effects of biodiesel addition as well as different EGR ratios on PCCI combustion behavior. The results show that the main effect of EGR on PCCI combustion of biodiesel blend is related to the HTHR and its effect on LTHR is low. With increasing biodiesel addition, the role of the chemical effect is increased compared to the thermodynamic and dilution effects. Rate of production analysis indicate that for the different biodiesel ratios, the effect of reaction nC7H16+HO2=C7H15-2+H2O2 is more effective on the start of combustion compared to the other reactions. For a defined biodiesel addition, with decreasing EGR, THC and CO are decreased, whilst NOx and ISFC are increased.

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