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Autoignition and detonation development from a hot spot inside a closed chamber: Effects of end wall reflection by Peng Dai; Zheng Chen; Xiaohua Gan; Mikhail A. Liberman is a Engineering article available to read on EtoBox.

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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 and detonation development. The pressure wave propagation and reflection in a small confined space may strongly interact with local end gas autoignition, leading to combustion characteristics different from those in a large chamber or open space. The present study investigates the transient autoignition process in an iso -octane/air mixture inside a closed chamber under engine-relevant conditions. The emphasis is given to the assessment of effects of the pressure wave-wall reflection and the mechanism of extremely strong pressure oscillation typical for super-knock. It is found that the hot spot induced autoignition in a closed chamber can be greatly affected by shock/pressure wave reflection from the end wall. Different autoignition modes respectively from the hot spot and the end wall reflection are identified. A non-dimensional parameter quantifying the interplay between different length and time scales is introduced, which helps to identify different autoignition regimes including detonati

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

Author

Peng Dai; Zheng Chen; Xiaohua Gan; Mikhail A. Liberman

Publisher

Elsevier Science; Elsevier ; Elsevier Ltd; Elsevier BV (ISSN 1540-7489)

Published

2021

Language

EN

Field

Engineering (Physical Sciences)