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Acta Armamentarii ›› 2018, Vol. 39 ›› Issue (1): 170-181.doi: 10.3969/j.issn.1000-1093.2018.01.019

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Research on Suppression Effect of Rear Edge Control Method on Aerodynamic Noise in Open Cavity

ZHANG Qun-feng1, YAN Pan-pan1, LI Jun2   

  1. (1.School of Civil Engineering, Beijing Jiaotong University, Beijing 100044, China;2.Shenyang Aircraft Design and Research Institute, Aviation Industry Corporation of China, Ltd., Shenyang 110035, Liaoning, China)
  • Received:2017-04-20 Revised:2017-04-20 Online:2018-03-13

Abstract: Improved delayed detached eddy simulation method based on Menter SST k-ω model is used to analyze the aero-acoustic characteristics of open cavity. Flow control method of porous rear wall combined with dissipative cavity is used to suppress the noise. The effects of aerodynamic noise suppression under the conditions of subsonic and supersonic inflows are analyzed. The control mechanism of aerodynamic noise from open cavity is studied using a variety of flow field analysis techniques, such as numerical schlieren method. The results show that the suppression effect is sensitive to the dissipative cavity length under the condition of subsonic inflow. If the dissipative cavity is too short, the noise level in open cavity can not be effectively suppressed by the control method, instead of increasing the noise level to 12 dB. The suppression effect is improved when increasing the length of dissipative cavity, the noise reduction level increases with the increase in dissipative cavity length. Under the condition of supersonic inflow, the aerodynamic noise inside the cavity is effectively suppressed by the control method, the self-sustained oscillation is terminated, the tone noise in the cavity disappears, and the maximum reduction of the sound pressure level (SPL) inside the cavity reaches to 23 dB. Key

Key words: opencavity, aerodynamicnoise, flowcontrol, numericalsimulation, improveddelayeddetachededdysimulation

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