氣相爆轟波馬赫反射非自相似性特征的實驗
[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 擄, 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.
【作者單位】: 南京理工大學(xué)機械工程學(xué)院;北京理工大學(xué)化工與環(huán)境學(xué)院;
【分類號】:O382
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