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本文首先对跨音速风洞的噪声机理作了简单的综合介绍。作为实例,较详细地分析了“NH-1”风洞试验段的声学环境。从大量试验数据得知:跨音速试验段的斜孔壁板的噪声值高于直孔壁板的噪声值达十分贝;跨音速壁板的结构参数(δ和ΔH)对声学环境有一定影响,而壁板的开闭比参数(K)对声学环境的影响则甚大。 本文最后介绍一些降低噪声的方法,这是很重要的,因为过高噪声级的声学环境是不宜作动态试验的。
This paper first makes a brief introduction to the noise mechanism of transonic wind tunnel. As an example, the acoustic environment of “NH-1” wind tunnel test section is analyzed in detail. From a large number of experimental data, it is found that the noise value of the slant-hole slab in the transonic test section is higher than that of the straight-hole slab wall by ten decibels; the structural parameters (δ and ΔH) of the transonic siding have an impact on the acoustic environment , While the wall opening and closing than the parameters (K) on the acoustic environment has a great impact. This article concludes with some noise reduction methods that are important because acoustic environments that are too loud at the noise level are not suitable for dynamic testing.