Effect of attack angle on flow characteristic of centrifugal fan

7th International Conference on Pumps and Fans

机械制造;工业技术

Wu, Y.^1 ; Dou, H.S.^1 ; Wei, Y.K.^1 ; Chen, X.P.^1 ; Chen, Y.N.^2 ; Cao, W.B.^2

Key Laboratory of Fluid Transmission Technology of Zhejiang Province, Zhejiang Sci-Tech University, Hangzhou

310018, China^1

Zhejiang Yilida Ventilator Co. Ltd., Taizhou

318056, China^2

关键词: Circumferential direction;    Different attacks;    Different operating conditions;    Impeller channels;    Incompressible Navier Stokes equations;    Performance curve;    Pressure differences;    Turbulence intensity;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/129/1/012059/pdf
DOI  :  10.1088/1757-899X/129/1/012059

学科分类：工业工程学

来源: IOP

【 摘 要 】

In this paper, numerical simulation is performed for the performance and internal flow of a centrifugal fan with different operating conditions using steady three-dimensional incompressible Navier-Stokes equations coupled with the RNG k-e turbulent model. The performance curves, the contours of static pressure, total pressure, radial velocity, relative streamlines and turbulence intensity at different attack angles are obtained. The distributions of static pressure and velocity on suction surface and pressure surface in the same impeller channel are compared for various attack angles. The research shows that the efficiency of the centrifugal fan is the highest when the attack angle is 8 degree. The main reason is that the vortex flow in the impeller is reduced, and the jet-wake pattern is weakened at the impeller outlet. The pressure difference between pressure side and suction side is smooth and the amplitude of the total pressure fluctuation is low along the circumferential direction. These phenomena may cause the loss reduced for the attack angle of about 8 degree.