Shock wave attenuation by grids and orifice plates
Shock wave attenuation by grids and orifice plates
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DOI：
10.1007/s00193-006-0019-0
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发表时间：
2006-11-01
期刊：
影响因子：
2.2
通讯作者：
Shapiro, H.
中科院分区：
文献类型：
--
作者：
Britan, A.;Igra, O.;Shapiro, H.
研究了不同几何形状和孔隙率的多孔屏障与弱激波的相互作用。在激波管测试段内安装一个屏障，将在入射激波与屏障正面碰撞时产生如下波型：来自屏障的反射激波和向激波管端壁传播的透射激波。一旦传播的激波到达端壁，它就被反射回屏障。这是屏障和端墙之间多重反射的开始。入射激波与屏障碰撞所产生的整个激波反射/相互作用周期可以在单个激波管试验中进行研究。提出了一种一维无粘流动模型，用于模拟入射激波与障壁初始碰撞所产生的流动。实验结果与基于一维流动模型的模拟结果相当吻合。根据所得的数值和实验结果，提出了一种冲击波衰减器的优化设计方法。建议的衰减器可以确保避难所通风系统的安全。
The interaction of weak shock waves with porous barriers of different geometries and porosities is examined. Installing a barrier inside the shock tube test section will cause the development of the following wave pattern upon a head-on collision between the incident shock wave and the barrier: a reflected shock from the barrier and a transmitted shock propagating towards the shock tube end wall. Once the transmitted shock wave reaches the end wall it is reflected back towards the barrier. This is the beginning of multiple reflections between the barrier and the end wall. This full cycle of shock reflections/interactions resulting from the incident shock wave collision with the barrier can be studied in a single shock tube test. A one-dimensional (1D), inviscid flow model was proposed for simulating the flow resulting from the initial collision of the incident shock wave with the barrier. Fairly good agreement is found between experimental findings and simulations based on a 1D flow model. Based on obtained numerical and experimental findings an optimal design procedure for shock wave attenuator is suggested. The suggested attenuator may ensure the safety of the shelter's ventilation systems.