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首页> 外文期刊>Experimental Thermal and Fluid Science: International Journal of Experimental Heat Transfer, Thermodynamics, and Fluid Mechanics >Dual-element directional shock wave attenuators
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Dual-element directional shock wave attenuators

机译：双元件定向冲击波衰减器

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This study explores the interaction between shock waves and dual-element porous plates used to ame_liorate the hazardous effects of these waves. Tests were performed in a shock tube to determine the effects that a pair of porous plates with directional resistance properties had on the initial peak pressure and impulse amelioration experienced by an end wall. Mild steel test specimens, ranging in porosity val_ues from 6.6% to 41.1%, were mounted two at a time at different spacings in the test section. Each plate had directional properties, i.e. resistance to flow was different for flow coming from either side. Four plates were used, and 48 plate configurations were tested. Side wall and end wall pressure measurements and schlieren photographs were taken of the interactions. Tests were run at Mach numbers of 1.23, 1.35 and 1.42. The separation distances between the plate specimens were varied between 30 mm and 60 mm; however, the distance between the downstream plate and the end wall was kept constant at 140 mm for all tests. Both the initial peak pressure and impulse amelioration values were found to be dependant on the plate combination porosity. As the porosity of the combination increased, the amelioration values decreased. Complementary plate combinations produced differing results as different wave interactions occur when plate positions were interchanged. The porosity of the combined plates was found to have an overriding influence on the end wall peak pressure and impulse amelioration values when compared to the effect that plate arrangement (i.e. geometrical influences) had. Impulse amelioration values were found to increase as the separation distance between plates were increased. The amplitude of the end wall pressure trace was found to increase as the incident Mach number was increased. The significant attenuation of the incident shock wave obtained during this study is attributed to the system of multiple reflected and transmitted waves that are produced by the presence of the plate specimens in series. This increases the frequency of shock wave and barrier interactions, when compared to just using a single barrier.
机译：这项研究探索了冲击波与用于改善这些波的危害的双元素多孔板之间的相互作用。在减震管中进行测试，以确定一对具有方向阻力特性的多孔板对初始峰值压力和端壁所经历的冲击改善的影响。在孔隙率值从6.6％到41.1％的低碳钢试样中，以不同的间距一次安装两个试样。每个板具有方向性，即，对于来自任一侧的流动，流动阻力不同。使用了四个板，并测试了48个板的配置。进行了相互作用的侧壁和端壁压力测量以及schlieren照片。以1.23、1.35和1.42的马赫数进行测试。板样品之间的间距在30毫米至60毫米之间变化。但是，在所有测试中，下游板和端壁之间的距离均保持在140 mm不变。发现初始峰值压力和脉冲改善值均取决于板组合孔隙率。随着组合物的孔隙率增加，改善值降低。当板位置互换时，由于发生不同的波相互作用，互补的板组合产生不同的结果。与板布置（即几何影响）所产生的影响相比，发现组合板的孔隙率对端壁峰值压力和冲击改善值具有主要影响。发现脉冲改善值随着板之间的分离距离增加而增加。发现端壁压力曲线的幅度随着入射马赫数的增加而增加。在这项研究中获得的入射冲击波的显着衰减归因于一系列连续存在的平板试样而产生的多次反射和透射波的系统。与仅使用单个障碍物相比，这会增加冲击波和障碍物相互作用的频率。

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