Transactions of the Korean Society of Mechanical Engineers B (대한기계학회논문집B)
- Volume 21 Issue 1
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- Pages.174-184
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- 1997
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- 1226-4881(pISSN)
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- 2288-5324(eISSN)
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Passive control of strength of shock wave
다공벽을 이용한 충격파 강도의 피동제어
- Choe, Yeong-Sang (Dept.of Mechanical Engineering, Kyungpook National University) ;
-
Gwon, Sun-Beom
(Dept.of Mechanical Engineering, Kyungpook National University)
;
- Jo, Cheol-Yeong (Dept.of Mechanical Engineering, Kyungpook National University)
- Published : 1997.01.01
Abstract
A shock wave, being an irreversible process, gives rise to entropy increase. A great deal of effort has been made to control shock wave and boundary layer interaction related to energy losses as well as problems of vibration and noise. In the present study, tests are performed on a roof mounted half circular arc in an indraft type supersonic wind tunnel to evaluate the effects of porosity, length and depth of cavity in passive control of shock wave on the attenuation of shock strength by reviewing the measured static pressures at the porous wall and cavity. Also the flow field is visualized by a Schlieren system. The results show that in the present study the porosity of 8% produced the largest reduction of pressure fluctuations and that for the same porosity, the strength of shock wave decreases with the increasings of the depth and length of cavity.