Abstract
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.
Highlights
在风洞气动噪声研究方面,国外风洞开始研究 的较早,在二十世纪六七十年代达到了鼎盛时期,如 Mabey 对跨声速风洞高速段的风洞发声机理进行了 初步研究[2] ,Lowson 和 Dennis 等定义了高速风洞边 界层噪声的经典公式[3⁃4] 。 国内八十年代开始也逐 步展开了对跨声速风洞的噪声机理及降噪措施研 究,由于彼时国内工业基础及综合实力的限制,国内 跨超声速风洞均为暂冲式风洞,研究重点一方面放 在暂冲式风洞降噪上,如陈玉清、龚卫斌、恽起麟等 对风洞的阀门降噪及排气消音器的设计开展了较为 系统的研究[5⁃7] , 另一方面彼时的跨声速风洞多采 用孔壁板设计,研究者对孔壁的发声机理,边棱音的 频谱特性以及试验段扩开角、开闭比等设计参数的 影响进行了较为细致的研究,同时对比了各类孔壁 降噪措施( 壁板铺网、孔内加隔板) 的效果[8⁃11] 。 随
According to the acoustic experi⁃ mental research conducted in the 0.6 m continuous transonic wind tunnel of CARDC, main noise sources in the tun⁃ nel loop included the compressor, the high⁃speed diffuser and the test section
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
Summary
在风洞气动噪声研究方面,国外风洞开始研究 的较早,在二十世纪六七十年代达到了鼎盛时期,如 Mabey 对跨声速风洞高速段的风洞发声机理进行了 初步研究[2] ,Lowson 和 Dennis 等定义了高速风洞边 界层噪声的经典公式[3⁃4] 。 国内八十年代开始也逐 步展开了对跨声速风洞的噪声机理及降噪措施研 究,由于彼时国内工业基础及综合实力的限制,国内 跨超声速风洞均为暂冲式风洞,研究重点一方面放 在暂冲式风洞降噪上,如陈玉清、龚卫斌、恽起麟等 对风洞的阀门降噪及排气消音器的设计开展了较为 系统的研究[5⁃7] , 另一方面彼时的跨声速风洞多采 用孔壁板设计,研究者对孔壁的发声机理,边棱音的 频谱特性以及试验段扩开角、开闭比等设计参数的 影响进行了较为细致的研究,同时对比了各类孔壁 降噪措施( 壁板铺网、孔内加隔板) 的效果[8⁃11] 。 随 实验流体力学, 2011,25(4) :74⁃78 LIAO Daxiong, CHEN Jiming, PENG Qiang, et al Key Design Techniques of the Low Noise Continuous Transonic Wind Tunnel [ J] . Journal of Experiments in Fluid Mechanics, 2011, 25(4) : 74⁃78 ( in Chinese) Flow Unsteadiness and Model Vibration in Wind Tunnels at Subsonic and Transonic Speeds [ R] .
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