【摘要】 通过对一台自行设计的高效高噪声对旋轴流通风机进行降噪实验研究表明：多段组合穿孔板声衬可大幅度降低对旋风机的离散噪声。使用有效长度为６００ｍｍ的多段组合穿孔板声衬降噪，风机的总声压级降低了９ｄＢ。更多还原

【Abstract】 It has been found that multisection liners not only attenuate the sound waves in ducts,but also to suppress sound wave thorugh the wave reflection at impedance discontinuities.As a consequence,the maximum noise reduction in a duct of given length can be realized by designing each section liner and different combination.In the present investigation,different combinations of multisection liners have been designed to suppress the discrete noises generated by a counter-rotating fan.The experimental results testified that,the noise was reduced by 9 dB in far field under the conditon of 60 cm liner length.更多还原