关键词: 气相爆轰波, 反射, 胞格结构, 马赫反射, 数值模拟

Abstract: To investigate the refraction behavior exhibited during the propagation and damage processes of shock waves and detonation waves in gaseous media, a computation program with finite volume method and adaptive mesh refinement method was developed based on the reactive Euler equations coupled with a two-step chemical reaction model. Through theoretical analysis and numerical simulations, we examined the transmission and refraction processes of shock waves and detonation waves at temperature interfaces. The variations of the transmitted shock wave speed and post-wave state with the amplitude of the interface temperature were presented, as well as the typical shock wave structure. The evolution of the cellular detonation wave was then analyzed using numerical Schlieren and smoked foil method. The results indicate that when a shock wave refracts into low-temperature gas, it forms a Mach stem and oblique shock wave at the interface, while entering high-temperature gas results in a double triple-point structure and a convex wave front. When the detonation wave refracts into low-temperature gas, it forms an inclined wave front at the interface. In contrast, when entering high-temperature gas, a convex wave front and a degenerated double triple point structure are formed. The propagation of cellular detonation waves exhibits distinct spatiotemporal evolution properties.

Key words: gaseous detonation, reflection, cellular structure, Mach reflection, numerical simulation