Abstract In this work, three different combustion modes were obviously observed under different oxygen concentrations, including normal combustion without end-gas autoignition, end-gas autoignition without detonation, and end-gas autoignition with developing detonation for gasoline. The results indicate that the intensities of pressure and pressure oscillation depend on the combustion mode. Compared with hydrogen, gasoline needed higher oxygen concentration or reactivity, and the propensity of end-gas autoignition with developing detonation occurrence was positively related to main flame propagation velocity, however, which needs lower velocity without shock wave to trigger the developing detonation occurrence. Furthermore, the pressure oscillations obtained from two pressure sensors with different locations demonstrated significant difference as detonation occurred, which may provide guidance for the measurement of super-knock intensity in a real engine.

中文翻译：

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密闭空间内尾气自燃与发展爆轰实验观察

摘要 在这项工作中，在不同的氧气浓度下，明显观察到三种不同的燃烧模式，包括没有尾气自燃的正常燃烧、没有爆震的尾气自燃和有发展爆轰的尾气自燃。结果表明，压力和压力振荡的强度取决于燃烧模式。与氢气相比，汽油需要更高的氧浓度或反应性，尾气自燃倾向与发展爆震发生呈正相关，而主火焰传播速度需要较低的速度，没有冲击波来触发发展爆震发生。此外，