流体机械

2007, No.415(01) 12-17+11

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考虑轴向速度非均匀性的微型轴流风扇扭叶片设计及其对气动性能的影响
Design of Twisted Blade for Micro Axial Fans Considering Nonuniform Axial Velocity and its Influence on Aerodynamic Performance

王企鲲;叶舟;陈康民;
WANG Qi-kun,YE-zhou,CHEN Kang-min(University of Shanghai for Science and Technology,Shanghai 200093,China)

摘要(Abstract):

通过推导微型轴流风扇叶片出口轴向速度沿叶高的分布方程,提出了一种考虑轴向速度非均匀性的扭叶片设计方法。通过CFD技术,数值研究了利用该方法所设计的各种形式扭叶片的气动性能及其变工况时的气动特点,并比较了工作于“自模区”与“非自模区”风扇的气动性能的差异。研究结果表明:与“自模区”的风扇相比,就“非自模区”的风扇而言,压力曲线没有最高压力点,随流量减少而压力几乎呈线性增加,且无失速点。效率曲线则显得更为平坦;按“刚性涡”设计的扭叶片虽效率低,但风压高;提高叶轮的轮毂比有助于提升风扇压力与效率。
A nonuniform distribution is presented for the axial velocity along the spanwise direction on the impeller outlet,by which an approach is proposed to design the twisted blade for micro axial fans considering the nonuniform axial velocity.By CFD technique,the aerodynamic performance of the different types of twisted blade is numerically investigated on their design and off-design operating conditions.The difference of the aerodynamic performance is also compared between the enlarged model fans in self-stimulated domain and micro-scale fans in non-self-stimulated domain.Results indicate: in non-self-stimulated domain,the pressure is almost linearly increased with the decreasing flowrate and there is no maximum pressure and no stall point,and the efficiency curve tends to much smoother.Compred with the "free vortex"twisted blade,the twisted blade designed by"rigid vortex"has higher pressure and lower efficiency.The improved ratio of hub and shroud may raise the pressure and efficiency for the micro axial fan.

关键词(KeyWords): 微型轴流风扇;扭叶片;气动特性
micro axial fan;twisted blade;aerodynamic performance

Abstract:

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基金项目(Foundation): 上海市科委重点项目“能源岛基地关键技术与建设”(2000-8)

作者(Author): 王企鲲;叶舟;陈康民;
WANG Qi-kun,YE-zhou,CHEN Kang-min(University of Shanghai for Science and Technology,Shanghai 200093,China)

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