Experimental study of Mach reflection induced by collision of oblique shock waves in a lead plate
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摘要: 采用线阵多普勒光纤探针测速技术（Doppler pins system，DPS）和高速光电分幅相机照相两种精密诊断技术，对铅飞层中斜冲击波对碰后的反射行为进行了观测。获得了飞层对碰部位速度-时间历史曲线和凸起形貌演化图像，给出了凸起轮廓发展演化过程、压力分布等实验数据和信息。结合冲击波反射理论，对铅飞层对碰区动力学现象进行了分析和解释，证实铅飞层中斜冲击波对碰后发生了马赫反射。Abstract: Using the line-array DPS (Doppler pins system) test technique and a high-speed photoelectric frame camera, we diagnosed the shock wave reflection behavior induced by collision of oblique shock waves in a lead plate, accurately measured the velocity history and captured the bulge evolution images of the collision region. By processing the velocity curves, we obtained such experimental informations as the velocity variation, pressure distribution and plate surface damage. Furthermore, Combining the theory of shock wave reflection, we analyzed and explicated the dynamic behavior of the lead plate’s collision region, concluding that it was Mach reflection that occurred after two oblique shock waves collided.
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表 1 各测点的速度曲线峰值和压力峰值
Table 1. Peak values of velocity and pressure at each test point
测点编号 速度峰值/(m·s−1) 压力峰值/GPa 测点编号 速度峰值/(m·s−1) 压力峰值/GPa 对碰前 对碰后 对碰前 对碰后 对碰前 对碰后 对碰前 对碰后 1 1 156.5 1 463.6 18.9 23.1 9 — 1 952.9 — 38.4 2 1 199.4 1 595.0 19.8 25.4 10 — 1 998.8 — 39.7 3 1 134.7 1 633.6 18.4 25.9 11 — 1 947.3 — 38.2 4 1 124.3 1 687.1 18.2 26.9 12 — 1 922.9 — 37.5 5 — 1 931.1 — 37.8 13 — 1 892.1 — 36.7 6 — 1 902.8 — 37.0 14 1 202.0 1 684.7 19.9 27.0 7 — 1 953.2 — 38.4 15 1 134.0 1 669.4 18.4 26.6 8 — 1 984.8 — 39.3 16 1 100.9 1 604.8 17.7 25.3 
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