爆轰波在突扩通道中传播的数值模拟研究

建立了描述甲烷 空气混合物爆轰波传播的单步化学反应爆轰模型 ,通过数值模拟研究了在二维突扩通道中爆轰波的强度变化和各种波行为。结果表明 :爆轰波在进入突扩通道初始阶段的衍射使爆轰波局部向爆燃转变 ;爆炸波在壁面发生马赫反射形成的高温高压区域将直接诱导自持爆轰波的重新形成。

Numerical simulation of detonation wave propagating through the channels with suddenly expending section

The phenomenon of detonation wave propagating through the channels with suddenly expending section was studied by numerical simulation. The theory model in which the single step chemistry reaction has been taken into account was found and a finite volume method was adopted to solve the theory model. The detailed process including diffraction and reflection of detonation wave was given. It is shown that the detonation wave is weakened to deflagration partly in initial stage of propagating into the large section channels according to detonation wave diffraction. The slip line could be formed, and the Mach reflection of detonation wave had occurred when the detonation wave interact with the well. The detonation is reignited by the high pressure and high temperature zone behind the Mach stem, which created by the Mach reflection of detonation wave.