入射震波馬赫數1.30~1.69範圍的震波於垂直鰭片和楔形體模型組行為之觀察及壓力量測已於國立成功大學航空大空工程所之震波管設備中完成。並從50度和35度斜面的楔形體與垂直鰭片組合模型之實驗結果顯示，二者分別產生了正規反射和馬赫反射，並由入射震波和反射震波先後分別與垂直鰭片產生反射到繞射(Reflection-to-Diffration)的交互作用，因而先後在鰭片尖端及後方造成了兩個渦漩結構。第一個渦漩因入射正震波於鰭片上的反射到繞射過程產生的剪切流場作用，因此一直停留在鰭片尖端。第二個渦漩是由於斜面上反射震波與鰭片的反射到繞射作用所誘發的流場分離作用，因此產生了分離渦漩。隨著入射震波強度的增加，可預期的剪切流場強度將相對的增強，由流場觀察顯示此二渦的結構更密實，由於此二渦之間的交互作用影響，使得流場變得相當複雜，因而在渦漩結構附近流場的密度梯度和壓力梯度應該有相當的程度變化，由壓力測量結果顯示於渦漩結構外圍流場附近可得到較大的壓升。然而正規反射到繞射作用於鰭片上的過程會造成較大的壓升，反觀馬赫反射到繞射作用於鰭片上的過程所造成的壓升則較小。

　　The study of normal shock wave reflected on the wedges of 50° and 35°,respectively,with an overhanging vertical fin with incident shock Mach number of 1.30 to 1.69 has been done in the shock tube facility of Institute of Aeronautics and Astronautics in National Cheng-Kung University. The reflection-to-diffraction process of incident normal shock on the vertical fin generates a vortex over the tip of the vertical fin. The reflection-to-diffraction process by the reflected shock generates a shading of vortices is behind the fin.The first vortex generated by the shear stress stays stationary on the tip of the fin. The second rolled-up of shading vortices were generated by the flow separation on tip of fin. With the increasing of the incident shock wave,it is expected the vorticity in the flow field will increase accordingly.The flow visualization shows that the first vortex was observed more well organized,and both density gradient and pressure gradient of flow field near the vortex should be larger. The measured results confirm that a greater pressure rise around the vortex than other places.Regular reflection-to -diffraction process on a vertical fin generates a greater pressure rise. Conversely,Mach reflection-to-diffraction process on a vertical fin generates a less pressure rise.

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