气相爆轰波马赫反射非自相似性特征的实验

发布时间：2019-07-13 20:45

【摘要】：为了研究在CJ(Chapman-Jouguet)状态下气相爆轰波马赫反射的非自相似性特征,搭建了由驱动段、传播段以及观测段组成的矩形管道;利用纹影和烟膜实验方法分别对3种预混气发生马赫反射现象进行了实验研究.实验结果表明:对稳态或非稳态气体,测量了马赫反射三波点位置高度,验证了马赫反射三波点轨迹线为波动的曲线,即自相似性对爆轰波马赫反射失效;非自相似性的重要特征是三波点轨迹线在楔角初始位置时基本遵循无反应冲击波理论计算结果,随后逐渐偏离并向有反应冲击波转变,之后接近平行于反应冲击波理论计算并稳定地处于两个理论值之间.最后给出在初始压力为10kPa和楔角为30°的条件下,对于所研究的3种气体,其马赫反射三波点发生转变的位置高度分别约为0.8,1.05cm以及0.5cm,可见相同初始条件下非稳态气体的马赫反射发生转变比稳态气体提前.
[Abstract]:In order to study the non-self-similarity characteristics of gas phase detonation wave Mach reflection in CJ (Chapman-Jouguet) state, a rectangular pipe composed of driving section, propagation section and observation section is built, and the Mach reflection phenomena of three kinds of premixed gases are studied by schlieren and smoke film experiments, respectively. The experimental results show that for steady-state or unstable gases, the position height of Mach reflection three-wave point is measured, and the trajectory line of Mach reflection three-wave point is verified to be the wave curve, that is, the self-similarity is invalid for detonation wave Mach reflection. The important feature of non-self-similarity is that the three-wave point trajectory basically follows the theoretical calculation results of unreacted shock wave at the initial position of the cuneiform angle, and then gradually deviates from and changes to reactive shock wave, and then is close to the theoretical calculation of reactive shock wave and stably lies between the two theoretical values. Finally, when the initial pressure is 10kPa and the cuneiform angle is 30 掳, the position height of Mach reflection three wave points is about 0.8, 1.05cm and 0.5cm, respectively. It can be seen that the transition of Mach reflection of unstable gas is earlier than that of steady gas under the same initial conditions.
【作者单位】：南京理工大学机械工程学院;北京理工大学化工与环境学院;
【分类号】：O382

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