End-gas autoignition has direct relevance to engine knock and thereby has been extensively studied. However, in the literature there are still some contradictions on how different factors affect end-gas autoignition and knock intensity. Specifically, there is contradictory literature on (1) whether faster combustion may promote or inhibit end-gas autoignition and engine knock, and (2) whether knock intensity increases or decreases with burned mass fraction (BMF). To answer these two questions, one-dimensional flame propagation and end-gas autoignition in a closed cylindrical chamber are investigated and the effects of flame propagation speed and chamber size on end-gas autoignition are examined in this study. In the transient numerical simulation, two fuels, hydrogen and iso-octane, are studied; and detailed chemistry is considered. It is shown that if the flame propagation is fast enough or the chamber is small enough, end-gas autoignition and knock can be prevented; otherwise, the knock intensity may increase as the flame propagation speed increases or as the chamber size decreases. The maximum pressure is found to change non-monotonically with the BMF as well as the flame propagation speed and chamber size. This helps to explain why there is contradictory literature on those two questions mentioned above. The answers to these two questions depend on the amount of unburned mixture at the moment of end-gas autoignition: if there is enough unburned mixture before end-gas autoignition, the maximum pressure increases with the flame propagation speed and BMF; otherwise, the opposite trend occurs. Besides, comparison between the results for hydrogen and iso-octane indicates that end-gas chemical reaction and heat release occurring before autoignition can greatly reduce the maximum pressure.

终端气体自燃与发动机爆震有直接关系，因此已进行了广泛的研究。但是，在文献中，关于不同因素如何影响最终气体自燃和爆震强度仍然存在一些矛盾。具体而言，关于（1）更快的燃烧是否会促进或抑制终端气体自燃和发动机爆震，以及（2）爆震强度是否随燃烧质量分数（BMF）增大或减小，存在矛盾的文献。为了回答这两个问题，研究了在封闭的圆筒形燃烧室中的一维火焰传播和终端气体自燃，并研究了火焰传播速度和燃烧室尺寸对终端气体自燃的影响。在瞬态数值模拟中，研究了两种燃料：氢气和异辛烷。并考虑详细的化学反应。结果表明，如果火焰传播足够快或腔室足够小，则可以防止终端气体自燃和爆震。否则，爆震强度可能会随着火焰传播速度的增加或腔室尺寸的减小而增加。发现最大压力随BMF以及火焰传播速度和燃烧室尺寸而非单调变化。这有助于解释为什么在上述两个问题上存在矛盾的文献。这两个问题的答案取决于终端气体自燃时未燃烧混合物的量：如果在终端气体自燃前有足够的未燃烧混合物，则最大压力随火焰传播速度和BMF的增加而增加；否则，就会出现相反的趋势。除了，