Turbulent flame–shock interaction inducing end-gas autoignition in a confined space

Abstract

To understand the detonation phenomenon in a confined space, especially in a downsized spark ignited engine and in explosion disasters, an experiment on the turbulent flame–shock interaction inducing end-gas autoignition was carried out in an improved constant volume combustion chamber equipped with a perforated plate. In the present work, the entire detonation formation process, including the turbulent flame acceleration, shock wave formation and enhancement process, motion and reflection of the shock wave, and detonation formation and propagation, was observed. A very strong pressure oscillation with a peak value of 5.7 MPa and a maximum amplitude of pressure oscillation of 3.8 MPa are achieved for the end-gas autoignition with detonation development.