円弧凹面を過ぎる衝撃波の反射・収束に関する研究

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  • Shock Wave Reflection and Focusing over Circular Concave Walls.
  • エンコ オウメン オ スギル ショウゲキハ ノ ハンシャ シュウソク ニカンス

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A planar shock wave reflecting from a circular concave wall generates a local pressure/temperature amplification at a certain point adjacent to the center of the concave wall. This phenomenon is, so-called, shock wave focusing but, in this case, it is caused by the collision of a pair of triple points formed on the shock reflection process. This mechanism is considered to be governed by the behavior of these triple points and depends on the shape of reflector. In this paper, in order to clarify the contribution of the triple points and its three-shock structure to the focusing mechanism, the difference of an initial angle of concave wall as a shape of reflector was discussed. Particularly, the behavior of a secondary triple point and its slip line behind a normal shock which was formed due to the inverse Mach reflection was investigated by using double exposure holographic interferometer. Numerical simulation was also carried out using Harten-Yee type second order upwind TVD finite difference scheme applied to 2-D Euler equations. The numerical results are compared with the interferograms.

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