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Pressure Fluctuations in Rectangular Cavity Flows

Published online by Cambridge University Press:  05 May 2011

Kung-Ming Chung
Kung-Ming Chung*
Affiliation:
Aerospace Science and Technology Research Center, National Cheng Kung University, Tainan, Taiwan 70101, R.O.C
*
*Associate Research Fellow
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Abstract

Experiments are performed to study the unsteadiness of rectangular cavity flows at Mach 0.325, 0.620 and 0.818. Typical characteristics of mean surface pressure distributions show a slight pressure variation near the front face, a local peak surface pressure ahead of the rear corner and a low pressure at immediate downstream of the cavity. Larger peak pressure and pressure variation near the cavity rear face are observed as the length-to-depth ratio increases. Surface pressure fluctuation distribution shows an increase toward the cavity rear face and reaches a peak value. At further downstream locations, the level of surface pressure fluctuation approaches the value of incoming flow. The amplitude of peak surface pressure fluctuation is associated with length-to-depth ratio and reaches the maximum at length-to-depth ratio of 8.60. This is considered due to intermittent switching between open- and closed-cavity flows. Higher moments of surface pressure signal at immediate downstream of the cavity show a similar trend. More negative skewness coefficient and larger deviation of flatness coefficient indicate the presence of more large negative events, which is mainly corresponding to mass removal process (breath-out phase). This unsteady mass flow is more pronounced at higher Mach number.

Keywords

Rectangular cavityTransonic flowPressure fluctuation.
Type
Articles
Information
Journal of Mechanics , Volume 15 , Issue 3 , September 1999 , pp. 97 - 102
Copyright
Copyright © The Society of Theoretical and Applied Mechanics, R.O.C. 1999

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