流体机械

2021, v.49;No.590(08) 57-63

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轴流风扇叶顶沟槽对间隙流动控制机理研究
Investigation of blade tip grooving effect on tip leakage vortex control mechanism of an axial fan

胡小文;李景银;闻苏平;胡斯特;
HU Xiaowen;LI Jingyin;WEN Suping;HU Site;Corporate Research Center,Midea Group;School of Energy and Power Engineering,Xi'an Jiaotong University;

摘要(Abstract):

采用数值和试验方法研究了轴流风扇叶顶沟槽对叶顶间隙泄漏流的控制机理。对比分析4种不同槽宽比(3:1,6:1,8:1,10:1)的叶顶贯穿式沟槽结构对叶顶泄漏涡的发展的影响。结果表明,不同槽宽比的沟槽都能削弱叶顶泄漏流强度,获得比原型更好的风扇效率,槽宽比越大对风扇效率的提升效果越明显。其主要作用机理是通过沟槽将压力面部分流体引射到吸力面形成射流作用,将原叶顶泄漏涡吹离叶片吸力面,并在沟槽下游顶部产生一个同向的新叶顶泄漏涡,新叶顶泄漏涡与原叶顶泄漏涡相互作用,降低了原叶顶泄漏涡的强度。
Blade tip grooving effect on tip leakage vortex control mechanism of an axial fan was studied by numerical and experimental methods.The effects of four groove structures with different width ratios(3:1,6:1,8:1,10:1)on the development of tip leakage vortex were compared and analyzed.The results show that all kinds of grooves can weaken the tip leakage flow and obtain higher efficiency than the prototype.Moreover,the larger the groove width ratio,the greater the efficiency of the fan.Its main mechanism is to introduce part of fluid on the pressure surface to the suction surface through the groove to form impingement,blow the primary tip leakage vortex away from the suction surface of the blade,and generate a new tip leakage vortex of same direction at the top downstream of the groove.The new tip leakage vortex interacts with the primary tip leakage vortex,thus reducing the intensity of the primary tip leakage vortex.

关键词(KeyWords): 沟槽;槽宽比;轴流风扇;叶顶泄漏涡
groove;groove width ratio;axial fan;tip leakage vortex

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基金项目(Foundation): 国家重点研发计划项目(2018YFB0606101)

作者(Author): 胡小文;李景银;闻苏平;胡斯特;
HU Xiaowen;LI Jingyin;WEN Suping;HU Site;Corporate Research Center,Midea Group;School of Energy and Power Engineering,Xi'an Jiaotong University;

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