多层烧结金属丝网在风洞中的应用

在跨超声速风洞中常采用在稳定段上游安装阻性消声器或谐振腔式消声器来降低暂冲式风洞主回路的主调压阀门、引射器或连续式风洞的压缩机等驱动风洞的动力源所产生的气流噪声强度,达到抑制这些噪声下传影响风洞试验段流场动态品质的效果。随着技术的不断更新特别是降噪技术的不断发展,采用多层烧结金属丝网作为一种新型的消声装置代替原有消声器成为可能。针对这种新技术是否能达到降低风洞气流噪声强度的目的,开展了试验研究方法,通过引导性试验证明,采用多层烧结金属丝网的消声效果优于常规的消声器,且出口气流品质得到较大改善,湍流度大幅度降低,可将这一技术运用到某超声速风洞中。通过性能测试,达到了预期目的,拓展了风洞的降噪技术。

Application of Multi-Layer Sintered-Wire Mesh in Wind Tunnel

For transonic and supersonic wind tunnel,fiber glass-filled or micro-perforated silencer,or resonant-cavity silencer is usually installed upstream of the settling chamber to reduce the strength of current noises generated by the driving force source components such as the main pressure-regulating valve,the ejector for the intermittent wind tunnel and the compressor for the continuous wind tunnel,restraining noise propagation from affecting the flow quality in the test section.With the development of technology,especially the technology of noise-reduction,multi-layer Sintered-wire mesh becomes a kind of new-style silencer which may replace the above-mentioned silencers.A method is proposed in this paper for this new technique to test whether or not reduce the strength of current noises for wind tunnel.Through pilot tests,it is proved that multi-layer sinter-wire mesh is better than above-mentioned silencers in the aspect of anechoic impact in the 0.3 m pilot wind tunnel,improving downstream flow quality remarkably and reducing the turbulence extensively.This technology can be applied to the xx supersonic wind tunnel.Through capability test in xx supersonic wind tunnel,this method achieve intention,expand the technology of noise-reduction for wind tunnel.