The shock wave propagation of the explosion in a pipe with holes was studied by a high-speed schlieren experimental system. In the experiments, schlieren images in the explosion were recorded by a high-speed camera from parallel and perpendicular orientations, respectively, and the pressure in the air was measured by an overpressure test system. In parallel orientation, it is observed that the steel pipe blocks the propagation of blast gases, but it allows the propagation of shock waves with a symmetrical shape. In perpendicular orientation, oblique shock wave fronts were observed, indicating the propagation of explosion detonation along the charge. Shock wave velocity in the hole direction is larger than that in the nonhole direction, indicating the function of holes in controlling blast energy, that is, leading blast energy to hole direction. Furthermore, the function of holes is verified by overpressure measurements in which peak overpressure in the hole direction is 0.87 KPa, 2.8 times larger than that in the nonhole direction. Finally, the variation of pressure around the explosion in a pipe with holes was analyzed by numerical simulation, qualitatively agreeing with high-speed schlieren experiments.

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高速Schlieren法在有孔管道中爆炸在冲击波中传播的实验研究

用高速schlieren实验系统研究了爆炸在具有孔的管道中的冲击波传播。在实验中，用高速摄像机分别从平行和垂直方向记录爆炸中的裂痕图像，并通过超压测试系统测量空气中的压力。在平行方向上，观察到钢管阻止了爆炸气体的传播，但是它允许传播对称形状的冲击波。在垂直方向上，观察到倾斜的冲击波波前，表明爆炸爆炸沿装药的传播。孔方向的冲击波速度大于非孔方向的冲击波速度，表明孔在控制爆炸能量（即将爆炸能量引向孔方向）中的作用。此外，通过过压测量来验证孔的功能，在过压测量中，孔方向的峰值超压为0.87 KPa，是非孔方向的峰值超压的2.8倍。最后，通过数值模拟分析了爆炸在带孔管道周围的压力变化，定性地与高速schlieren实验相吻合。