caa a22 4500 388067802 CHVBK 20180307125138.0 cr unu---uuuuu 161130e199909 xx s 000 0 eng 10.1017/S172771910000037X doi S172771910000037X pii (NATIONALLICENCE)cambridge-10.1017/S172771910000037X Chung Kung-Ming Aerospace Science and Technology Research Center, National Cheng Kung University, Tainan, Taiwan 70101, R.O.C Pressure Fluctuations in Rectangular Cavity Flows [Elektronische Daten] [Kung-Ming Chung] 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. Copyright © The Society of Theoretical and Applied Mechanics, R.O.C. 1999 Rectangular cavity nationallicence Transonic flow nationallicence Pressure fluctuation nationallicence Journal of Mechanics Cambridge University Press 15/3(1999-09), 97-102 1727-7191 15:3<97 1999 15 JOM https://doi.org/10.1017/S172771910000037X text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1017/S172771910000037X text/html Onlinezugriff via DOI NATIONALLICENCE 100 1- Chung Kung-Ming Aerospace Science and Technology Research Center, National Cheng Kung University, Tainan, Taiwan 70101, R.O.C NATIONALLICENCE 773 0- Journal of Mechanics Cambridge University Press 15/3(1999-09), 97-102 1727-7191 15:3<97 1999 15 JOM CC0 http://creativecommons.org/publicdomain/zero/1.0 nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-cambridge