Effect of Swept Blade on Performance of a Small Size Azial Fan
Skewed-swept blade shows excellent performance in improving the efficiency and decreasing the air noise of. compressors and gas turbines. A great of research indicates that the flow mechanism of skewedswept blade is controlling the aggregation of low energy flow in the end wall regions and radial second flow. In this paper numerical research is carried out to study the effects of swept blade on the aerodynamic and aeroacoustic performance of a 77.6mm-diameter cooling fan. The cooling fans are normally small size and axial, which are widely used to cool the electronic elements. The 3D steady numerical simulations of three fans, which have forward-swept 10°blade, 0°blade and backward-swept 10° respectively, are finished based on the CFD commercial software Fluent. The efficiency and pressure curves of fans are gained and compared with experiment data. Results show that both the forwardswept blade and backward-swept blade worsens the efficiency of the cooling fan. The sweep of blade changes the radial distribution of the axial velocity at the inlet of the fan. The unsteady flows of above three fans are simulated with LES model at a same flow rate 0.99m3/min. The aerodynamic noise sources are gained. Then the levels of noise emitted by the fans are calculated with FW-h equation. Compared with the 0°fan, the forward-swept 10°blade increased the noise about 1.2dB,but the backward-swept 10°blade decrease the noise 1.1 dB.
swept blade small azial fan aerodynamic performance aeroacoustic performance
Ailing Yang Tao Tang Hui Zhang Kangmin Chen
College of Power Engineering, University of Shanghai for Science and Technology, JunGong Road 516#, PO419, Shanghai 200093, China
国际会议
The Fourth International Symposium on Fluid Machinery and Fluid Engineering(第四届流体机械与流体工程国际会议)
北京
英文
279-284
2008-11-25（万方平台首次上网日期，不代表论文的发表时间）