Study on initiation mechanism of oblique detonation induced by blunt bump on wedge surface

Abstract

This paper studies the mechanism of oblique detonation wave (ODW) initiation induced by a blunt bump in the induction zone. The effects of geometric shapes and viscosity on the flow field characteristics are analyzed. Results demonstrate that the blunt bump promotes the formation of hot spots and the initiation of the oblique detonation wave. The interactive wave configuration at the front of the obstacle plays a vital role in the formation of the oblique detonation wave. The transition from the regular interaction to the Mach one results in the oblique detonation initiation. The viscous boundary layer influences the wave structures, the combustion characteristics, and thermodynamic parameters. Recirculation zone formed behind the streamline surface is smaller compared with ones formed behind circular and elliptic surfaces.