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An Analysis on Cycle-by-cycle Variation and Trace-knock using a Turbulent Combustion Model Considering a Flame Propagation Mechanism
Technical Paper
2019-01-2207
ISSN: 0148-7191, e-ISSN: 2688-3627
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English
Abstract
Gasoline engines have the trace-knock phenomena induced by the fast combustion which happens a few times during 100 cycles. And that constrains the thermal efficiency improvement due to limiting the ignition timing advance. So the authors have been dedicating a trace-knock simulation so that we could obtain any pieces of information associated with trace-knock characteristics. This simulation consists of a turbulent combustion model, a cycle-by-cycle variation model and a chemical calculation subprogram. In the combustion model, a combustion zone is considered in order to obtain proper turbulent combustion speed through wide range of engine speed. From a cycle-by-cycle variation analysis of an actual gasoline engine, some trace-knock features were detected, and they were involved in the cycle-by-cycle variation model. And a reduced elementary reaction model of gasoline PRF (primary reference fuel) was customized to the knocking prediction, and it was used in the chemical calculation. Through the trace-knock simulation, some advantages of the cycle-by-cycle variation model and the chemical reaction calculation became obvious. In this paper, the details of these calculation methods are described, and the advantages of this calculation are discussed.
Authors
- Taizo Kitada - Mitsubishi Motors Corporation
- Takayuki Shirota - Mitsubishi Motors Corporation
- Shinji Hayashi - Mitsubishi Motors Corporation
- Dai Tanaka - Mitsubishi Motors Corporation
- Masato Kuchita - Mitsubishi Motors Corporation
- Yasuyuki Sakai - University of Fukui
- Yukihide Nagano - Kyushu University
- Toshiaki Kitagawa - Kyushu University
Citation
Kitada, T., Shirota, T., Hayashi, S., Tanaka, D. et al., "An Analysis on Cycle-by-cycle Variation and Trace-knock using a Turbulent Combustion Model Considering a Flame Propagation Mechanism," SAE Technical Paper 2019-01-2207, 2019, https://doi.org/10.4271/2019-01-2207.Data Sets - Support Documents
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References
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