铝粉/空气二维黏性两相爆轰的数值模拟

为了深入研究爆轰波形成和传播的机理与特性，建立了管内铝粉/空气二维黏性两相爆轰过程的数学模型，采用守恒元与求解元方法进行数值计算，并对其物理参数的分布进行了分析。结果表明:管内燃烧转爆轰的初期，压力沿径向变化明显，与壁面碰撞有明显的反射波；燃烧转爆轰的中后期，压力沿轴向变化明显，但径向效应仍不能忽视，碰撞形成的反射波对最终稳定爆轰波的形成影响较大。研究结果同时表明:不仅铝粉颗粒初始半径对爆轰波的形成与传播有一定的影响；而且气体的黏性作用在研究爆轰管内近壁面处流场时不容忽视。研究结果有利于进一步揭示铝粉燃烧转爆轰的机理。

Numerical simulation for aluminum/air two-dimensional viscous two-phase detonation

A two-dimensional mathematical model of viscous aluminum/air two-phase detonation is established. The flow field inside the detonation tube was calculated by the method of conservation element and solution element. And the distribution of physical parameters is analyzed. Numerical results show that in the early stages of the deflagration-to-detonation transition process in the tube, pressure change obviously along the radius and significant reflection wave is collided off the wall. In the later period， pressure along the axis changes obviously, but the radial effect still can’t be ignored. The reflection wave from the collision is important on the formation of steady detonation wave. Numerical results also show that the initial radius of the aluminum powder particles have certain influence on the formation and propagation of detonation wave. And certain influence of gas viscosity on flow field near the wall in the detonation tube was exerted. The results of the study can be utilized to reveal the mechanism of the deflagration-to-detonation transitim.