Numerical Analysis on the Characteristics of the Pressure Wave Generation Initiated by the Onset of the Auto-Ignition in the End-Gas
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- 形態
- 価格
- 一般価格(税込):¥1,100 会員価格(税込):¥880
- 文献番号
- 20239504
- 文献・情報種別
- SETC
No.2023-01-1804
- 掲載ページ
- 1-6(Total 6 p)
- 発行年月
- 2023年 10月
- 出版社
- (公社)自動車技術会 & SAE
- 言語
- 英語
- イベント
- Small Powertrains and Energy Systems Technology Conference 2023
書誌事項
著者(英) | 1) Kenji YOSHIDA |
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勤務先(英) | 1) Hiroshima Institute of Technology |
抄録(英) | The end-gas auto-ignition and associated pressure wave generation in a premixed gas with a spatial distribution is numerically investigated. This study assumes that the auto-ignition phenomenon in the end-gas of PCCI combustion, a next-generation combustion method which is expected to achieve both low fuel consumption and low emissions at a high level. Detailed numerical analysis considering the chemical kinetics on the one-dimensional compressible fluid flow with high spatial and time resolution was performed to clarify the detailed phenomena of the auto-ignition and onset of the pressure wave and its propagation in the end-gas. Followings are results. (1) The pressure wave generations related with the auto-ignition in the end-gas is categorized into two types. The cases that the auto-ignition velocity, which is the localized auto-ignitive propagation velocity relative to the unburned mixture, exceeded the local sound speed, or not. The spatial distribution of the equivalence ratio in the initial unburned mixture affects the auto-ignition velocity. (2) In the cases that the Mach number of the auto-ignition velocity was less than one, the intensity of the pressure wave associated with the auto-ignition is relatively small, and the pressure wave propagates quietly with sound speed. (3) On the other hand, in the cases that the Mach number of the auto-ignition velocity exceeded one, very strong pressure wave is initiated by the auto-ignition. The temperature rise due to the auto-ignition and the pressure rise propagates synchronously toward the unburned mixture. 翻訳 |