Simulation of the non-thickness wind wheel in centrifugal fan based on FLUENT

HUANG Pu, XIAO Lin-Hui, WU Sheng-Bin
(Guangdong Zhongshan Baide Kitchen Co.,Ltd.,Zhongshan 528478, China)

Abstract: Aiming at the accuracy and simplicity of centrifugal fan in simulation process. RNG k-ε turbulence model and SIMPLEC velocitypressure algorithm were used to solve steady internal flow and LES combined with FW-H acoustic equation were used to solve transient farfield noise by software FLUENT. The effects of the thickness of wind wheel on model simplification, mesh generation, performance calculation was studied, which were compared with the actual measured value. The results show that wind wheel without thickness is superior to wind wheel with thickness in processing model and generating unstructured mesh. Flow distribution and volume flow rate of centrifugal fan are constant, the error is only 1.6% compared to actual value. Due to the influence of turbulence surrounded blades, the noise of wind wheel with thickness is 2.8% higher than that of wind wheel without thickness, however, the noise of wind wheel without thickness is closer to the actual measured noise.
Key words: computational fluid dynamic（CFD）; FLUENT; centrifugal fan; non-thickness wind wheel; flow noise