Effect of Wall Confinement on the Reflection of Diffracted Shock Wave

CSME 2018/10
Volume 39 No.5 : 487-490

Effect of Wall Confinement on the Reflection of Diffracted Shock Wave

Yao-Chung Hsu^a, Yei-Chin Chao and Kung-Ming Chung^b
^aDepartment of Aeronautics and Astronautics National Cheng Kung University, Tainan, Taiwan 701, ROC. Now in National Space Organization, Hsinchu, Taiwan 300, ROC.
^bAerospace Science and Technology Research Center, National Cheng Kung University, Tainan, Taiwan 711, ROC.

Abstract: The effect of wall confinement on propagation of a diffracted shock wave in an expansion tube is investigated. The pressure distribution shows a plateau of high pressure, following by a pressure drop. An increase in the expansion ratio results in a decrease in the amplitude of peak wall pressure. The concept of piston work is also adopted in this study. The maxima of peak wall pressure in an expansion tube can be correlated with the equivalent piston work of an incident wave and the expansion ratio.

Keywords: wall confinement, expansion ratio, diffracted shock.

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