流体机械

2019, v.47;No.569(11) 1-7

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叶片出口角对多翼离心风机性能影响的数值研究
Numerical Study on the Influence of Blade Outlet Angle on the Performance of Multi-blade Centrifugal Fan

于思琦;吴大转;杨帅;
Yu Siqi;Wu Dazhuan;Yang Shuai;College of Energy Engineering,Zhejiang University;

摘要(Abstract):

以空调用多翼离心风机为研究对象,建立了3组不同叶片出口角叶轮模型,通过数值模拟获得风机外特性以及叶轮中间截面、风机出口的压力,速度,湍动能分布和叶轮进出口的压力脉动情况,并进行对比分析。结果表明:随着叶片出口角的增大,在420~725 m~3/h流量范围内风机的风压和效率有所提升;内部流场中,风机出口低速区的面积增大,蜗壳出口和蜗舌区域的总压分布均匀性降低,叶轮流道内的涡量增多;叶轮进出口在叶频及其倍频处的压力脉动幅值有一定程度的降低。为了得到较好的气动性能和噪声性能的风机,需要将叶片出口角控制在合理的范围之内。研究结果对于风机进行气动性能和降噪性能设计具有较好的指导意义。
A multi-blade centrifugal fan for air conditioning was chosen as the research object to establish the models for 3 kinds of impellers with different blade outlet angles. The external performance of the centrifugal fan was predicted through CFD simulation,the pressure,velocity,turbulent energy distribution at middle section of impeller and fan outlet,and the pressure pulsation at the impeller inlet and outlet were obtained and analyzed comparatively. The results show that as the outlet blade angle increases,the pressure and efficiency of the fan increase in the flow range of 420~725 m~3/h.The area of the low-speed zone at the fan outlet increases,the uniformity of the total pressure at the volute outlet and the volute tongue area decreases,and the vorticity in the impeller flow passage increases. Meanwhile,the pressure pulsation amplitude of the impeller inlet and outlet has a certain degree of reduction at the blade frequency and its multiple frequencies. In order to obtain a fan wit better aerodynamic and noise performance,it is necessary to control the blade outlet angle within a reasonable range.The research results prove a better guidance for the design of aerodynamic performance and noise reduction performance of the fan.

关键词(KeyWords): 多翼离心风机;叶片出口角;气动性能;数值模拟
multi-blade centrifugal fan;blade outlet angle;aerodynamic performance;numerical simulation

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基金项目(Foundation): 国家自然科学基金项目(51706199)

作者(Author): 于思琦;吴大转;杨帅;
Yu Siqi;Wu Dazhuan;Yang Shuai;College of Energy Engineering,Zhejiang University;

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