Effect of attack angle on flow characteristic of centrifugal fan

[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.

[发布机构] 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

[效力级别] 工业技术 [学科分类] 工业工程学

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