Effects of EGR on ignition and combustion in a diesel spray

The object of this study is to investigate experimentally effects of EGR gas on the ignition delay and the combustion, in a diesel spray using a rapid compression-expansion machine. EGR gas has CO2, H2O and N2. Therefore, we also research the influence of each gas on the ignition and the combustion...

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Published inKikai Gakkai ronbunshū = Transactions of the Japan Society of Mechanical Engineers Vol. 81; no. 828; p. 15-00031
Main Author KOBORI, Shigeharu
Format Journal Article
LanguageJapanese
English
Published The Japan Society of Mechanical Engineers 01.01.2015
Subjects
Carbon dioxide
Combustion
Delay
Diesel
Diesel engine
Diesel fuels
Ignition
Ignition delay
Internal combustion engine
Sprayers
Sprays
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Summary:The object of this study is to investigate experimentally effects of EGR gas on the ignition delay and the combustion, in a diesel spray using a rapid compression-expansion machine. EGR gas has CO2, H2O and N2. Therefore, we also research the influence of each gas on the ignition and the combustion individually. The results show that changes of ignition delay are few until the EGR rate of 20 %. When the EGR rate reaches 25 %, ignition delay increases drastically. The gradient of temperature against the ignition delay in arrhenius plot changes at 900 K. That phenomenon is independent of an ambient gas composition. Additions of CO2 and H2O to air prevent to lengthen ignition delay because of a low oxygen condition. Additions of N2 to air have longer ignition delay than EGR condition. And the reduction in the ambient gas oxygen concentration tends to make the two-stage combustion vigorous.
Bibliography:ObjectType-Article-1
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ISSN:2187-9761
2187-9761
DOI:10.1299/transjsme.15-00031