文章摘要
黄知龙,常伟,廖达雄,王宁,张国彪.金属烧结丝网在内场消声中的应用[J].,2020,39(3):417-421
金属烧结丝网在内场消声中的应用
Application of interior noise reduction for metal sintering screen
投稿时间:2019-07-27  修订日期:2020-04-26
中文摘要:
      利用试验手段研究了暂冲式风洞气流通道内安装烧结金属丝网对气流噪声和湍流度的抑制作用。测试结果表明:多层烧结金属丝网可在全频段内大幅降低上游来流噪声,最大可达21dB;在低频范围不存在类似微穿孔板消声器声压级放大的现象;消声量与无量纲的压力损失系数成正比,压力降与丝网层数呈现出非线性叠加的结果。另外烧结金属丝网对气流速压和速度脉动亦具有突出的抑制效果。例如,试验段马赫数1.5时,120目26层+160目26层组合烧结金属丝网出口气流速压脉动幅值减小为入口来流的18%,湍流度由11.7%降至3%。因此多层烧结金属丝网适用于暂冲式风洞的内场降噪。
英文摘要:
      Metal sintering screens were mounted in settling chamber of the intermittent wind tunnel to reduce noise downstream control valve. An experiments study was conducted to find how this anechoic measure works. The results showed that metal sintering screen could largely attenuate the flow noise in all band,and the flow noise suppression level could reach about21dB for some test Mach number.SEspecially,unlike micropunch plate muffler,there was no amplificatory phenomenon of pressure level in low frequent. And the sound deadening capacity was proportional to the non-dimensional pressure loss coefficient. Moreoverthe metal sintering screen could also obviously reduce the fluctuation amplitude and turbulence intensity of air flows through it. Take “26 layers 120 mesh +26 layers 160 mesh” sintering metal screen combinations for example, the flow fluctuation amplitude reduced to 18 percent of inlet and the turbulence intensity changed from 11.7% to 3% when the velocity of coming flow was about 13m/s. So it could be concluded that metal sintering screen is a very excellent denoising device for the inner field flow of intermittent wind tunnel.
DOI:10.11684/j.issn.1000-310X.2020.03.014
中文关键词: 暂冲式风洞,烧结金属丝网,降噪,湍流度,试验
英文关键词: Intermittent  wind tunnel,Metal  sintering screen,Noise  reduction,Experiment
基金项目:
作者单位E-mail
黄知龙 中国空气动力研究与发展中心 huangzl401@163.com 
常伟 中国空气动力研究与发展中心 110048894@qq.com 
廖达雄 中国空气动力研究与发展中心 huangzl401@163.com 
王宁 中国空气动力研究与发展中心 huangzl401@163.com 
张国彪 中国空气动力研究与发展中心 huangzl401@163.com 
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