采用仿鱼形叶片的多翼离心风机性能研究

Inspired by the maneuvering swimming posture and vortex characteristics of carangiform fish, a bionic blade of the multi-blade centrifugal fan is designed according to the turning feature of carangiform fish. Numerical method is conducted to investigate the effects of bionic blade and single-arc blade on the aerodynamic performance of multi-blade centrifugal fan. Compared with the original centrifugal fan with the single-arc blades, the flow rate and efficiency of the multi-blade centrifugal fan with the bionic blades are increased by 12.5% and 5.65%, respectively. The vortex intensity in the impeller channel consisting of bionic blades is weaker than that in the original impeller channel with single-arc blades. The pressure fluctuation occurring near the region of volute tongue is suppressed and the periodic unsteady interaction between the impeller and the volute tongue is weakened. When the bionic blade is used, the aerodynamic performance of multi-blade centrifugal fan is improved. Numerical results on the aerodynamic noise show that for the original fan, low-frequency and intermediate-frequency noises have important contributions to the sound pressure level while the aerodynamic noise of the centrifugal fan with the bionic blades mainly concentrates in the intermediate-frequency sound section. The distribution of noise frequency and noise propagation path of the original fan are different from that of the multi-blade centrifugal fan with the bionic blades. Compared with the original fan, the average A-weighted sound pressure level of the centrifugal fan with the bionic blades is reduced by 2.78 dB.