微型轴流风扇不同流量下的损失对比  

Loss in Micro-axial Fan under Different Flow Rates

作　　者：陈金鑫[1] 赖焕新[1] 

机构地区：[1]华东理工大学承压系统与安全教育部重点实验室,上海200237

出　　处：《华东理工大学学报（自然科学版）》2015年第5期718-724,共7页Journal of East China University of Science and Technology

摘　　要：以一种电子元件冷却用的单级微型轴流风扇为研究对象,数值模拟研究了该风扇级的流场,分析了设计转速下驼峰曲线右侧4种流量下损失差异的产生原因。研究结果表明:在转子通道内,损失主要发生在泄漏涡通过的区域(I区)、压力侧边界层区域(II区)以及吸力侧边界层区域(III区)。随着流量的增加,I区叶尖涡系的影响范围变小,但涡量强度的最大值Ω0变大且都发生在叶顶间隙中,相应地在该区域高损失范围变小,但在其中心区域损失系数ζpt值变大;II区高涡强范围及其Ω0值均变大,相应地该区域高损失范围及其ζpt值也变大;III区高涡强范围及其Ω0值变化不大,相应地该区域高损失范围及其ζpt值变化也不大。综上可知:在转子通道内损失随着流量的增加而变大。在静子通道内损失随着流量的增加变化较小,所以级环境下全压效率随着流量的增加而减小。The flow field of a micro-axial fan stage, which is widely used in cooling systems of electronic devices, is numerically studied. The discrepancy of loss among four operating points which locates in the right of the hump curve is analyzed. It is revealed that in the rotor passage, loss occurs mainly in the region （region I） where tip leakage vortex （TLV） passes through, in boundary area of pressure surface （regionⅡ） and in boundary area of suction surface （region Ⅲ）, respectively. With the increase of the flowrate9 the region affected by tip clearance vortices gets smaller, while the magnitude of vorticity becomes bigger. Accordingly, the range of high loss region here gets smaller and the magnitude of high loss center becomes bigger. In region II, both the range and the magnitude of high vorticity area get bigger, so the range and the magnitude of the high loss area become bigger. In region Ⅲ, no obvious change is observed. Overall, loss rises with the increase of the flowrate in the rotor passage. In the stator passage, no significant difference is observed under different flowrates, so in the stage environment total pressure coefficient decreases with the increase of the flowrate.

关 键 词：微型轴流风扇级 混合平面法 泄漏涡 损失 二次流 涡量强度 

分 类 号：TH42[机械工程—机械制造及自动化]