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A Study of the Mechanism Causing Pressure Waves and Knock in an SI Engine under High-Speed and Supercharged Operation
In this study, knocking over a wide range of engine speeds was visualized using an optically acssessible engine. In addition, knock under a high compression ratio and supercharged, lean combustion was investigated. The results revealed that under high-speed knock, the flame propagation velocity declined when low-temperature oxidation reactions occurred. Subsequently, autoignition began locally and expanded gradually. Eventually, it was observed that a highly brilliant autoignited flame appeareddoi:10.20485/jsaeijae.9.1_23 fatcat:qgje4rq6obbd3fzyx7rtcg4uli