Abstract The interaction of a shock wave and particles filling the inside of a straight tube was numerically investigated to understand the mitigation mechanism on a blast wave outside the tube. A shock wave propagating along the particle layer inside the straight tube induced differences in the velocity and temperature between the particle layer and shocked air, inducing energy transfer through a drag effect, heat transfer, and nozzling term. Because the particle layer hardly moved inside the straight tube, the drag effect and nozzling term were too small to mitigate the blast wave. On the other hand, the heat transfer from the air to the particle layer absorbed several tens of percent of the energy released by the high explosive and was the dominant factor in mitigating the blast wave. To estimate the effect of the heat transfer between the particle layer and shocked air, we proposed a novel index estimated by the shocked-air properties, using the Rankine–Hugoniot relation. The numerical data for the heat transfer rate were simply and adequately estimated by the novel index, which indicated that the shocked-air properties were responsible for the heat transfer rate used to determine the mitigation of the blast wave.

中文翻译：

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玻璃颗粒填充部分密闭空间对冲击波减缓作用的数值研究

摘要 通过数值研究了冲击波和填充在直管内部的粒子的相互作用，以了解管外冲击波的缓解机制。沿直管内颗粒层传播的激波引起颗粒层与受激空气之间的速度和温度差异，通过阻力效应、热传递和喷嘴项引起能量传递。由于颗粒层在直管内几乎不移动，阻力效应和喷嘴项太小，无法减轻冲击波。另一方面，从空气到颗粒层的热传递吸收了高能炸药释放能量的百分之几十，是减轻冲击波的主要因素。为了估计颗粒层和冲击空气之间的传热效果，我们提出了一个新的指数，使用 Rankine-Hugoniot 关系，通过冲击空气特性估计。传热率的数值数据通过新指数简单而充分地估计，这表明冲击空气特性是用于确定冲击波缓解的传热率的原因。