用环形激波聚焦实现爆轰波直接起爆的数值模拟  

Numerical investigation of detonation direct initiation induced by toroidal shock wave focusing

作　　者：滕宏辉[1] 张德良[1] 李辉煌[2] 姜宗林[1] 

机构地区：[1]中国科学院力学研究所高温气体动力学重点实验室,北京100080 [2]中国科学技术大学力学和机械工程系,合肥230026

出　　处：《爆炸与冲击》2005年第6期512-518,共7页Explosion and Shock Waves

基　　金：国家自然科学基金项目(10276035)

摘　　要：利用基元反应模型和有限体积法对环形激波在可燃气体中聚焦实现爆轰波直接起爆进行了数值模拟。研究结果表明,标准状态下的氢气-空气混合气体在马赫数为3.1以上的环形激波聚焦产生的高温高压区作用下会诱发可燃气体的直接起爆形成爆轰波,爆轰波与激波和接触间断相互作用产生了复杂的波系结构;爆轰波爆点位置在对称轴上并不是固定的点,而是随着初始激波马赫数的变化而发生移动;可燃气体初始温度和压力对起爆临界马赫数都有影响,但是初始温度的影响大得多。Detailed chemical reaction model and finite volume method are used to numerically investigate detonation direct initiation induced by the toroidal shock wave focusing in combustible gas mixture. Numerical results show that detonation direct initiation will be initiated by toroidal shock wave focusing in the standard hydrogen-air gas mixture if the incident Mach number is above 3.1. Then the detonation wave interacts with shock waves and contact surfaces, which results in complex wave system. The initiation point is not fixed on the focusing point but varies with the incident shock Mach number. The critical Mach number is influenced by the initial pressure and temperature, but the temperature is the main factor.

关 键 词：爆炸力学 直接起爆 激波聚焦 爆轰波 数值模拟 

分 类 号：O381[理学—流体力学]