The present study focuses on the mitigation of shock wave using novel geometric passages in the flow field. The strategy is to produce multiple shock reflections and diffractions in the passage with minimum flow obstruction, which in turn is expected to reduce the shock wave strength at the target location. In the present study the interaction of a plane shock front (generated from a shock tube) with various geometric designs such as, 1) zig-zag geometric passage, 2) staggered cylindrical obstructions and 3) zig-zag passage with cylindrical obstructions have been investigated using computational technique. It is seen from the numerical simulation that, among the various designs, the maximum shock attenuation is produced by the zig-zag passage with cylindrical obstructions which is then followed by zig-zag passage and staggered cylindrical obstructions. A comprehensive investigation on the shock wave reflection and diffraction phenomena happening in the proposed complex passages have also been carried out. In the new zig-zag design, the initial shock wave undergoes shock wave reflection and diffraction process which swaps alternatively as the shock front moves from one turn to the other turn. This cyclic shock reflection and diffraction process helps in diffusing the shock wave energy with practically no obstruction to the flow field. It is found that by combining the shock attenuation ability of zig-zag passage (using shock reflection and diffraction) with the shock attenuation ability of cylindrical blocks (by flow obstruction), a drastic attenuation in shock strength can be achieved with moderate level of flow blocking.

本研究的重点是在流场中使用新的几何通道来减轻冲击波。该策略是在具有最小流动障碍的通道中产生多次激波反射和衍射，从而有望降低目标位置的激波强度。在本研究中，平面激波前沿（由激波管产生）与各种几何设计的相互作用，例如，1) 之字形几何通道，2) 交错圆柱形障碍物和 3) 具有圆柱形障碍物的之字形通道使用计算技术进行研究。从数值模拟可以看出，在各种设计中，最大的冲击衰减是由带有圆柱形障碍物的锯齿形通道产生的，然后是锯齿形通道和交错的圆柱形障碍物。还对拟议的复杂通道中发生的冲击波反射和衍射现象进行了全面调查。在新的锯齿形设计中，初始激波经历激波反射和衍射过程，当激波前沿从一圈移动到另一圈时，这些过程交替交换。这种循环冲击反射和衍射过程有助于扩散冲击波能量，几乎不会阻碍流场。