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| Experiment on the Effect of Front-edge Jet on Cavity Noise Suppression |
| Received:July 07, 2020 Revised:August 12, 2020 |
| View Full Text View/Add Comment Download reader |
| DOI：10.7643/issn.1672-9242.2020.09.019 |
| KeyWord:cavity noise active flow control front-edge jet |
| Author | Institution |
| YAN Hao |
Aircraft Strength Research Institute of China, Xi'an , China;Aviation Key Laboratory of Science and Technology on Aviation Acoustics and Vibration, Xi'an , China |
| HUANG Wen-chao |
Aircraft Strength Research Institute of China, Xi'an , China;Aviation Key Laboratory of Science and Technology on Aviation Acoustics and Vibration, Xi'an , China |
| PAN Kai |
Aircraft Strength Research Institute of China, Xi'an , China;Aviation Key Laboratory of Science and Technology on Aviation Acoustics and Vibration, Xi'an , China |
| LIU Xing-qiang |
Aircraft Strength Research Institute of China, Xi'an , China;Aviation Key Laboratory of Science and Technology on Aviation Acoustics and Vibration, Xi'an , China |
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| Abstract: |
| The work aims to investigate the suppression effects of three jet methods on cavity self-excited oscillation noise by adding rectangular mouth jet, nine-hole jet and nine-slope-hole jet. The method of cavity noise suppression based on front-edge jet at subsonic and transonic speed (Ma=0.3, 0.45, 0.6) was studied by wind tunnel test. The microphone was installed at the designated position of the cavity to obtain the noise information in the cavity under different working conditions. The peak frequency of the cavity, the sound pressure level distribution at the bottom and back wall of the cavity, the total sound pressure level distribution and the frequency curve characteristics at different measuring points were comprehensively compared under the three jet methods, and the suppression effects of the three front-edge jet methods on the cavity noise were evaluated. When the flow velocity was Ma=0.3, the three jet methods had certain suppression effects on the sound pressure level at the peak frequency of the cavity, but the introduction of the front-edge jet led to an increase in the total sound pressure level of the noise at the bottom of the front-bottom of the cavity. When the flow velocity was Ma=0.45, the three jet methods had significant suppression effects on the sound pressure level and broadband noise at the peak frequency of the cavity. When the flow velocity was Ma=0.6, the noise level in the cavity was enhanced by the other two jet methods except the rectangular mouth jet. Introducing jet at the front-edge of the cavity can effectively reduce the noise at the peak frequency of the cavity and broadband noise at a certain flow velocity, and the suppression effect of front-edge jet on cavity noise varies greatly with different jet methods. |
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