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近十年来,世界各国的风洞工作者均十分重视风洞气流噪声的特性及其对试验数据影响的研究。目前,国外跨音速风洞普遍采用减轻边缘音和控制噪声反馈的方法,一种是插片法,另一方法为铺网法。两种方法均能使开孔壁试验段的噪声水平达到稍高于风洞洞壁湍流边界层产生的噪声水平。但两种方法比较,铺网法的工艺较插片法简单,减噪效果优于插片法。
In the past decade, wind tunnel workers in all countries in the world have attached great importance to the characteristics of wind tunnel airflow noise and its impact on experimental data. At present, transonic wind tunnels in foreign countries generally adopt methods for reducing edge noise and controlling noise feedback. One is the inserting method, and the other is the laying method. Both methods can make the noise level of the wall test section slightly higher than the noise level produced by the turbulent boundary layer of the wind tunnel wall. However, comparing the two methods, the process of laying the net method is simpler than the insert method, and the noise reduction effect is better than the insert method.