Complex unsteady flow characteristics and flow-field structures occur in a high speed flow past open cavities, such as fluctuating pressure and velocity. Some sound pressure level (SPL) inside the cavities can reach 170 dB, which may damage certain installed apparatuses inside the cavity and its structural components. Noise suppression for open cavities is therefore a focus of research. This paper presents an analysis of the aero-acoustic characteristics inside an open cavity of a length-depth ratio (L/D) of 6 with or without a zero-net-mass-flux jet at Mach numbers of 0.9 and 1.5. The suppression effects of different zero-net-mass-flux jets on aerodynamic noise are discussed by analyzing the sound pressure level distribution on the centerline of the cavity floor and the sound pressure frequency spectrum (SPFS) characteristics at different measurement points. The results indicate that the jet can suppress aerodynamic noise inside the cavity, and that, at a Mach number of 0.9, it is more effective in SPL reduction in the front range of the cavity than in the rear. The suppression effect of the jet on the aerodynamic noise within the cavity is better when its exit is on the cavity-fore-face, with its direction parallel to the free-stream, than when its exit is in front of the cavity-fore-face with its direction vertical to the free-stream. The jet has little effect at a Mach number of 1.5.
YANG Dangguo, WU Jifei, LUO Xinfu
. Investigation on Suppression Effect of Zero-net-mass-flux Jet on Aerodynamic Noise Inside Open Cavities[J]. ACTA AERONAUTICAET ASTRONAUTICA SINICA, 2011
, 32(6)
: 1007
-1014
.
DOI: CNKI:11-1929/V.20110324.1201.007
[1] Heller H H, Bliss D B. Aerodynamically induced pressure oscillations in cavities-physical mechanisms and suppression concepts. AFFDL-TR-74-133, 1975.
[2] Meganathan A J, Vakili A D. An experimental study of open cavity flows at low subsonic speeds. AIAA-2002-0280, 2002.
[3] Hamed A, Basu D, Das K. Detached eddy simulations of supersonic flow over cavity. AIAA-2003-549, 2003.
[4] Ashcroft G B, Takeda K, Zhang X. A numerical investigation of the noise radiated by a turbulent flow over a cavity[J]. Journal of Sound and Vibration, 2003, 265(1): 43-60.
[5] Chang K S, Park S O. Hybrid RANS/LES simulation of deep cavity flow. AIAA-2004-53, 2004.
[6] Hamed A, Das K, Basu D. Numerical simulations of fluidic control for transonic cavity flows. AIAA-2004-429, 2004.
[7] Bertier N, Courbet B, Dutoya D, et al. Large-eddy simulation of a subsonic flow over a cavity on general unstructured grids. AIAA-2004-679, 2004.
[8] Rowley C W, Juttijudata V, Williams D R. Cavity flow control simulations and experiments. AIAA-2005-0292, 2005.
[9] Rubio G, de Roeck W. Numerical study of noise generation mechanisms in rectangular cavities//Proceedings of the Euromech Colloquium 467 Turbulent Flow and Noise Generation. 2005.
[10] 罗柏华. 二维高亚声速空腔流激振荡的数值模拟研究[J]. 空气动力学学报, 2002, 20(1): 84-88. Luo Baihua. Numerical simulation of 2D high subsonic cavity flow oscillation[J]. Acta Aerodynamic Sinica, 2002, 20(1): 84-88. (in Chinese)
[11] 侯中喜, 易仕和, 王承尧. 超声速开式空腔流动的数值模拟[J]. 推进技术, 2001, 22(5): 400-403. Hou Zhongxi, Yi Shihe, Wang Chengyao. Numerical analysis of supersonic open cavity[J]. Journal of Propulsion Technology, 2001, 22(5): 400-403. (in Chinese)
[12] 李晓东, 刘靖东, 高军辉. 空腔流激振荡发声的数值模拟研究[J]. 力学学报, 2006, 38(5): 599-604. Li Xiaodong, Liu Jingdong, Gao Junhui. Numerical simulation of flow-induced oscillation and sound generation in a cavity[J]. Chinese Journal of Theoretical and Applied Mechanics, 2006, 38(5): 599-604. (in Chinese)
[13] 杨党国, 范召林, 李建强, 等. 弹舱流动特性数值模拟及风洞试验研究[J]. 空气动力学学报, 2009, 27(3): 378-383. Yang Dangguo, Fan Zhaolin, Li Jianqiang, et al. Studies on flow characteristics of cavity by numerical simulation and wind tunnel test[J]. Acta Aerodynamic Sinica, 2009, 27(3): 378-383. (in Chinese)
[14] Wilcox F J. Experimental investigation of porous-floor effects on cavity flow fields at supersonic speeds. NASA-TP-3032, 1990.
[15] Taborda N, Bray D, Knowles K. Passive control of cavity resonances in tandem configurations. AIAA-2001-2770, 2001.
[16] Zhang J, Morishita E, Okunuki T, et al. Experimental and computational investigation of supersonic cavity flows. AIAA-2001-1755, 2001.
[17] Rona A, Brooksbank E J. Injection parameters for an effective passive control of cavity flow instability. AIAA-2002-0119, 2002.
[18] Meganathan A J, Vakili A D. Upstream mass-injection effects on cavity flow oscillations(PIV measurements and numerical simulations). AIAA-2003-0224, 2003.
[19] Rona A. Control of transonic cavity flow instability by streamwise air injection. AIAA-2004-682, 2004.
[20] Sahoo D, Annaswamy A, Zhuang N, et al. Control of cavity tones in supersonic flow. AIAA-2005-793, 2005.
[21] Lada C, Kontis K. Fluidic control of cavity configurations at subsonic and supersonic speeds. AIAA-2005-1298, 2005.
[22] Smith B R, Welterlen T J, Maines B H, et al. Weapons bay acoustic suppression from rod spoilers. AIAA-2002-0662, 2002.
[23] Arunajatesan S, Shipman J D, Sinha N, et al. Mechanisms in high-frequency control of cavity flows. AIAA-2003-0005, 2003.
[24] Ukeiley L S, Ponton M K, Seiner J M, et al. Suppression of pressure loads in cavity flows[J]. AIAA Journal, 2004, 42(1): 70-79.
[25] Williams D R, Drazen F, Morrow J. Experiments on controlling multiple acoustic modes in cavities. AIAA-2000-1903, 2000.
[26] Amitay M, Smith D R, Kibens V, et al. Aerodynamic flow control over an unconventional airfoil using synthetic jet actuators[J]. AIAA Journal, 2001, 39(3): 361-370.
[27] Rowley C W, Williams D R. Control of forced and self-sustained oscillations in the flow past a cavity. AIAA-2003-0008, 2003.
[28] Debiasi M, Yan P, Little J, et al. An experimental study of subsonic cavity flow-physical understanding and control. AIAA-2004-2123, 2004.
[29] Efe M O, Debiasi M, Yan P, et al. Control of subsonic cavity flows by neural networks-analytical models and experimental validation. AIAA-2005-294, 2005.
CJA