管口声辐射特性在消声器出口端应用的研究

声音通过管道传播到管口有一定的反射特性,研究这一特性将其应用于消声器出口端,提高消声器性能。计算出管口的声阻抗,作为出口边界条件代入Virtual.Lab Acoustics软件中计算消声器出口端的消声性能,使计算结果能反映出管口的声辐射特性。计算研究显示,在保持相同的流通面积下,消声器采用多出口管,管径缩小反射现象更剧烈,能够起到提高消声性能的作用,并开展了相应的试验研究,验证了这一结果。研究工作对消声器管口的设计有一定借鉴作用。

Research on Acoustic Radiation Characteristics of Nozzles at Outlets of Mufflers

Sound transmission through the pipe to the nozzle has a reflection,which can be applied to the outlet to improve the performance of the muffler. Calculate the acoustic impedance of the orifice, as the outlet boundary conditions to evaluate the muffler performance of the outlet, using the Virtual.Lab Acoustics. The calculation shows that under the same flow area, the more outlet pipes the muffler uses, the more diameter of the muffler is reduced, which can improve the performance of noise reduction. A series of corresponding experiments has been carried out to confirm the result. Also, the research has a reference to the design of muffler outlet.