叶根倒角对小型轴流风扇静特性的影响  

Effect of Blade Root Fillet on Static Characteristics of Small Axial Fans

作　　者：吴文军[1] 金英子[1] 王艳萍[1] 储微[1] 余辅波 

机构地区：[1]浙江理工大学机械与自动控制学院,杭州310018

出　　处：《浙江理工大学学报（自然科学版）》2015年第6期812-817,共6页Journal of Zhejiang Sci-Tech University(Natural Sciences)

基　　金：国家自然科学基金项目(51276172);浙江省自然科学基金项目(LZ14E050004)

摘　　要：以小型轴流风扇为原型,对其压力面侧叶根沿中弧线的不同方位进行倒角,分别建立了1/3倒角模型(距离前缘1/3中弧线)、2/3倒角模型(距离前缘2/3中弧线)和全倒角模型(沿整个中弧线)。采用RNGκ-ε湍流模型、SIMPLE算法、二阶精度的迎风差分格式等数值方法分析风扇的内部流场特性。结果表明:1/3倒角和2/3倒角模型会提高风扇的静压和效率,但1/3倒角模型的性能更优;全倒角对风扇的静压没有多大影响,但是会使风扇效率降低;压力面侧的叶根局部倒角促使流道中流体再分配,从而改善了吸力面侧叶顶和叶根的低压区以及压力面侧叶根附近的高压区,进而避免了产生二次流的可能性;同时叶根倒角会增加压力面叶中附近的高压区面积,使风扇的做功能力增强。Small axial fan served as the prototype,and blade root at the side of pressure surface was filleted along the different locations of central arced curve to establish 1/3root fillet model(leading edge 1/3central arced curve),2/3root fillet model(leading edge 2/3central arced curve)and the whole root fillet model(along the whole central arced curve).Characteristics of internal flow field of the fan were analyzed by RNGκ-εturbulence model,SIMPLE algorithm and second order accurate upwind difference scheme.The results show that 1/3root fillet model and 2/3root fillet model increase the static pressure and efficiency of the fan,but the performance of the former is better;the whole root fillet model influences static pressure of the fan little,but fan efficiency decreases;the local root fillet at the pressure side makes the fluid in the passageway redistribute to improve the low pressure area near the blade tip and root of the suction side and the high pressure area near the blade root at the pressure side,so that the possibility of secondary flow is avoided;simultaneously,root fillet increases the high pressure area of 1/2blade height near the pressure side and reinforce power capability of the fan.

关 键 词：轴流风扇 叶根倒角 内部流场特征 数值模拟 

分 类 号：TH421[机械工程—机械制造及自动化]