关键词: 入射激波;反射激波;火焰;不稳定性;单步反应模型

Abstract: The interaction between shock wave and flame occurs frequently in supersonic combustion and deflagration-to-detonation. To further understand the phenomenon, a computational study of the interactions between a planar incident shock wave and its reflected shock wave with a spherical flame was carried out by using the three-dimensional Navier-Stokes equations coupled with a chemical reaction, in which the combustion process was described by a single-step chemistry model. It can be found that the numerical simulation of the interactions between shock waves and flame agrees well with the experimental results in a confined space which embodies the three-dimensional effect of the numerical simulation. When the flame interacts with the incident shock wave, it deforms through Richtmyer-Meshkov instability. In this case, the physical process takes an important role and the flame expansion is relatively not obvious. While the deformed flame interacts with the reflected shock wave again, the flame expands rapidly, and maintains the heat release rate at a high level, which suggests that the chemistry reaction plays an important role in this stage. With the action of reflected shock wave, formation of complicated vortex structure of deformed flame can enhance the transport of heat and mass, and therefore can raise the burning rate.

Key words: Incident shock wave; Reflected shock wave; Flame; Instability; Single-step chemistry model