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首页> 外文期刊>SN Applied Sciences >Blast mitigation by perforated plates using an explosive driven shock tube: study of geometry effects and plate numbers
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Blast mitigation by perforated plates using an explosive driven shock tube: study of geometry effects and plate numbers

机译：采用爆炸驱动冲击管的穿孔板喷射：几何效应和板号的研究

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This work is set in the context of blast mitigation based on geometric means, namely perforated metallic plates or grids. When a shock wave passes through a perforated plate, the flow field is modified, and new shock waves are created, as well as regions of vortices and turbulence in which the energy of the wave can be dissipated. In this study, an explosive driven shock tube (EDST) was used to visualize the interaction of a blast wave with perforated plates or with a piece of cast metallic foam. Additionally, the overpressure and the impulse of the reflected blast wave on a wall located downstream were assessed. The use of an EDST allowed the evaluation of the mitigation capacity under a high dynamic loading. Several combinations of perforated plates were tested, varying the geometry and the number of plates, as well as switching between two different spacings. When the shock wave collided with a plate, we observed that part of the incident shock wave was reflected by the plate, while the remaining wave was transmitted through it. Downstream of the plate, both the overpressure and the impulse were reduced, this effect being more prominent as the porosity of the plates decreased. When two plates were placed as obstacles, this phenomenon of reflection/transmission was repeated twice consecutively, further reducing the downstream reflected overpressure and impulse. An array of three plates or a piece of metallic foam were even more effective in mitigating the blast wave. Varying the distance between two or three plates had no effect on blast mitigation.
机译：基于几何装置，即穿孔金属板或网格，在喷砂缓解的背景下设定了这项工作。当冲击波穿过穿孔板时，改变流场，并且创建了新的冲击波，以及涡流区域的区域可以消散波的能量。在该研究中，使用爆炸性的驱动冲击管（EDST）来可视化冲发波与穿孔板的相互作用或用一块铸造金属泡沫。另外，评估了在位于下游的壁上的反射爆炸波的过压和脉冲。 EDST的使用允许评估缓解能力在高动态负载下的缓解能力。测试多孔板的几种组合，改变几何形状和板的数量，以及在两个不同的间距之间切换。当冲击波与板碰撞时，我们观察到一部分入射冲击波被板反射，而剩余波通过它传输。板下的下游减少了过压和脉冲，随着板的孔隙率降低，这种效果更突出。当两个板被置于障碍物时，这种反射/透射现象的连续重复两次，进一步减少了下游反射的过压和脉冲。三个板块或一块金属泡沫阵列在减轻爆发波方面更有效。改变两种或三个板之间的距离对喷射缓解没有影响。

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