The experiment research about the noise reduction effect of the bionic volute tongue of a centrifugal fan

In this article,a coupling bionics and sound absorption volute tongues has been designed by extracting the characteristic elements about noise reduction from wings' tissue,to reduce the noise of the centrifugal fan. According to the principle of bionics,the morphological units of bionic volute tongue include: the seam panel,the microcell plate,and the cavity,it can be found out that the noise was reduced by the interactions among them after the analysis of noise reduction mechanism,and it has a little influence on the performance of the centrifugal fan. It can be discovered by the compared experiments that the overall sound pressure level LAof the centrifugal fan with a bionic volute tongue is 0. 5 d B lower than that of the prototype fan in the standard running conditions and the most can be 2. 5 d B lower in the other conditions. It indicate that it is an effective way of noise reduction through bionic volute,and it needs to do more research on the certain relation between the size of morphological units and the effect of noise reduction.