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Shock Tube Simulation of Low Mach Number Blast Waves

机译：低马赫数爆炸波的冲击管模拟

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Preliminary tests have confirmed that the X3 expansion tunnel can operate satisfactorily as a non reflected shock tube to give good quality, long duration flows at low Mach numbers. The development of a new orifice plate concept enables full use of the shock tube length to be utilised, and test flows up to 62 ms have been obtained (the actual test time will depend on shock Mach number selected). The starting process of the orifice plate causes a minor disturbance to propagate back through the subsonic shock heated gas, which can be seen as noise in the test station. The tunnel can be configured to produce any Mach number and ambient pressure level likely to be required for the study of explosions in mines. For each Mach number of interest, a different orifice plate has to be fabricated with throat area tuned for that condition. For the observation of post-shock phenomena, a window section must be installed in the shock tube, at an axial station located for maximum steady test time duration.
机译：初步测试已经证实，X3膨胀隧道可以作为非反射式激波管令人满意地运行，从而在低马赫数下提供高质量，长久的流动。新孔板概念的发展使冲击管的长度得以充分利用，并且获得了长达62 ms的测试流量（实际测试时间将取决于所选的冲击马赫数）。孔板的启动过程会导致轻微的干扰通过亚音速冲击加热的气体传播回去，这在测试台中可以看作是噪音。隧道可以配置为产生研究矿山爆炸可能需要的任何马赫数和环境压力水平。对于每个感兴趣的马赫数，必须制造不同的孔板，并针对该条件调整喉部面积。为了观察震后现象，必须在冲击管中的轴向位置上安装一个窗口部分，以确保最大稳定的测试持续时间。

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