一个55美元的模拟冲击波冲击管
A $55 Shock Tube for Simulated Blast Waves
摘要：
激波管通常用于测试候选装甲材料，验证数值模型，并在动物模型中进行模拟爆炸实验。由于国防部希望将可穿戴传感器作为爆炸剂量计，冲击管也可用于校准和测试这些设备。测试这些传感器不需要对候选装甲进行实验测试所需的高爆炸压力。需要一种廉价、有效且容易获得的测试这些压力传感器的方法。众所周知，突然释放压缩气体可以产生可重复的冲击波阵面，并且可以通过改变气体被压缩的压力来微调压力。使用Crosman 0.177口径的气手枪（不装载任何弹丸）来压缩和释放24英寸长的3/4英寸直径的标准管接头的一端中的空气，以模拟管的另一端处的冲击波。使用了不同数量的泵来改变最大爆炸压力。正如预期的那样，使用10个泵来压缩空气的试验产生了101.99 kPa（+/- 2.63 kPa）的最大平均峰值压力。7台泵的设计具有第二大峰值压力，平均峰值压力为89.11 kPa（+/-1.77 kPa）。具有5个泵的设计具有第三大峰值压力，平均峰值压力为78.80 kPa（+/-1.74 kPa）。3台泵产生的平均峰值压力为61.37 kPa（+/-2.20 kPa）。2台泵产生的平均峰值压力为48.11 kPa（+/-1.57 kPa）。只有1个泵的设计具有最小的峰值压力，产生的平均峰值压力为30.13 kPa（+/-0.79 kPa）。这种廉价的激波管设计具有30至45秒的发射周期。
英文摘要：
Shock tubes are commonly employed to test candidate armor materials, validate numerical models, and conduct simulated blast experiments in animal models. As DoD interests desire to field wearable sensors as blast dosimeters, shock tubes may also serve for calibration and testing of these devices. The high blast pressures needed for experimental testing of candidate armors are unnecessary to test these sensors. An inexpensive, efficient, and easily available way of testing these pressure sensors is desirable. It is known that releasing compressed gas suddenly can create a repeatable shock front, and the pressures can be finely tuned by changing the pressure to which the gas is compressed. A Crosman 0.177 caliber air pistol was used (without loading any pellets) to compress and release air in one end of a 24 inch long 3/4 inch diameter standard pipe nipple to simulate a blast wave at the other end of the tube. A variable number of pumps were used to vary the peak blast pressure. As expected, the trials where 10 pumps were used to compress the air resulted in the largest average peak pressure of 101.99 kPa (+/- 2.63 kPa). The design with 7 pumps had the second biggest peak pressure, with an average peak pressure of 89.11 kPa (+/-1.77 kPa). The design with 5 pumps had the third largest peak pressure, with an average peak pressure of 78.80 kPa (+/-1.74 kPa). 3 pumps produced an average peak pressure of 61.37 kPa (+/-2.20 kPa). 2 pumps produced an average peak pressure of 48.11 kPa (+/-1.57 kPa). The design with just 1 pump had the smallest peak pressure and produced an average peak pressure of 30.13 kPa (+/-0.79 kPa). This inexpensive shock tube design had a shot-to-shot cycle time of between 30 and 45 seconds.
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