Autoignition and detonation development from a hot spot inside a closed chamber: Effects of end wall reflection

The advancement of highly boosted internal combustion engines (ICEs) with high thermal efficiency is mainly constrained by knock and super-knock, respectively, due to the end gas autoignition detonation development. pressure wave propagation reflection in a small confined space may strongly interact local autoignition, leading characteristics different from those large chamber or open space. present study investigates transient process an iso-octane/air mixture inside closed under engine-relevant conditions. emphasis given assessment effects wave-wall mechanism extremely strong oscillation typical for super-knock. It found that hot spot induced can be greatly affected shock/pressure wall. Different modes respectively wall are identified. A non-dimensional parameter quantifying interplay between length time scales introduced, which helps identify regimes including development near shown cause super-knock devastating oscillation. However, hardly produce enough obtained results provide fundamental insight into knocking