Volume 38, Number 4, August 2020
|Page(s)||855 - 861|
|Published online||06 October 2020|
Experimental Research on Noise Reduction for Continuous Transonic Wind Tunnel Loop
State Key Laboratory of Aerodynamics, China Aerodynamics Research and Development Center, Mianyang 621000, China
2 Facility Design and Instrument Institute, China Aerodynamics Research and Development Center, Mianyang 621000, China
The noise level of wind tunnel test section is respected as one of the most important performance specifications to represent the flow field quality, especially for large scale wind tunnel. According to the acoustic experimental research conducted in the 0.6 m continuous transonic wind tunnel of CARDC, main noise sources in the tunnel loop included the compressor, the high-speed diffuser and the test section. To reduce the noise in the test section, it is necessary to prevent the test section from the compressor noise propagated both forward and backward. In 0.6 m wind tunnel loop, acoustic treatments were installed on both the compressor rear cone and the fourth corner to prevent the noise emitted from the compressor from propagating forward. The vanes in the forth corner were filled with glass fibers and covered with perforated panels. And the compressor rear cone was covered with three layers of micro-perforated panels. With acoustic treatment in the tunnel loop and the second throat throttling, the fluctuation pressure coefficient (ΔCp) is lower than 0.8%, which is close to the international advanced level.
Key words: continuous wind tunnel / transonic wind tunnel / noise reduction / experiment / acoustic treatment
关键字 : 连续式风洞 / 跨声速风洞 / 洞体回路 / 被动降噪 / 试验研究
© 2020 Journal of Northwestern Polytechnical University. All rights reserved.
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