入射震波於馬赫數1.26~1.66範圍的震波，於不同粗糙度之楔形體表面上觀察與研究，已於國立成功大學航空太空工程研究所之震波管設備中完成。本實驗使用影圖法來擷取於斜角為30、40及50度之楔行體斜面上震波反射的流場結構，並利用砂紙來改變模型表面之粗糙度，從極度光滑至表面砂紙平均粗糙度為0.0174cm共做四組實驗來進行分析與比較。實驗結果可以看出，在模型為30及40度之實驗條件時會產生馬赫反射，但增加表面粗糙度後，會使得入射震波與反射震波之夾角及三相點軌跡線夾角變小，甚至會讓40度的模型從馬赫反射改變為正規反射。在50度的模型實驗條件下則會產生正規反射，當增加表面粗糙度後會使得射震波與反射震波之夾角增大，由上述兩者結果可以發現，其結果可歸因於反射震波之移動速度減緩所致，因此增加表面粗糙度必然會使震波反射有減弱的情況發生。

The investigation of the reflection of a planar shock wave with Mach number in the range between 1.26 and 1.66, over wedged surface with different degree of roughness has been done in the shock tube facility of Institute of Aeronautics and Astronautics in National Cheng-Kung University. The flow field structure over wedges of 30 o, 40 o and 50o by shadowgraph technique, and the sandpaper has been used to change the surface roughness of the model wedges. The shock reflection over wedges of 30o and 40o are of Mach reflection. The observed angle between the incident and reflection shock, as well as the triple point trajectory angle are shown being decreased as the model surface roughness increased. The type of reflection over wedge of 40o is being changed from Mach reflection into regular reflection. The type of shock reflection over 50o wedge model is of regular reflection. The angle between the incident and reflection shock is also being increased as the model surface roughness increased. The flow visualization results indicate that the speed of reflection shock becomes slower. It shows that the reflected shock wave becomes weaker as the model surface roughness increased.

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