开缝翼型特性对轴流风机反风影响的数值模拟  

Numerical simulation on effect of aerodynamic performance of airfoil with slot on reverse ventilation of axial-flow fan

作　　者：陈更林[1] 王利军[1] 闫小康[2] 闫照粉[3] 

机构地区：[1]中国矿业大学电力工程学院,江苏徐州221116 [2]中国矿业大学化工学院,江苏徐州221116 [3]徐州建筑职业技术学院市政工程学院,江苏徐州221008

出　　处：《煤炭学报》2010年第8期1395-1400,共6页Journal of China Coal Society

摘　　要：结合煤矿用轴流风机4种反风方式,以RAF-6E翼型为研究对象,当开缝宽度为0、0.01b、0.02b、攻角为-15～17°时,应用CFD技术揭示了该翼型正、反向吹风的流动特征,得到了该翼型正、反向吹风特性曲线。研究表明:该翼型正、反向吹风的基本流动特征类似,但反向吹风时气泡式局部分离较为严重,翼型前缘始终存在分离,且分离点、分离区大小变化不大,失速攻角均约为10°,反向吹风特性明显不如正向;缝隙形状、尺寸对翼型特性影响明显,正向吹风时,开缝使零升力攻角增大,且当攻角增加时,开缝与原始翼型的升力系数之差依次为正、负、正,开缝与原始翼型的阻力系数之差依次为正、负,恰好与反向吹风时相反。对轴流风机反转反风,翼型开缝技术能够控制分离,推迟失速,明显改善正、反向吹风时分离工况附近的翼型性能,扩大有效工作范围,对非分离工况却有一定的不利影响,所以翼型开缝技术提高了轴流风机反转时的反风能力,扩大了有效工作范围,使反风量≥40%有实现可能。Combined with 4 types of reverse ventilation of axial-flow fan for coal mine,the RAF-6E airfoil was taken as example.When the width of slot was 0,0.01b,0.02b,and the attack angle was-15 ～ 17°,its aerodynamic performance at normal and reverse ventilation was studied by CFD.The results show that the basic flow characteristics are similar for normal and reverse ventilations.Separation of airfoil at reverse ventilation is mainly at local area.There is always separation at the large end of airfoil.And there is little change in separation location and area.The stall angle of attack is about 10°.The performance in reverse ventilation is obviously worse than in normal ventilation.The shape and size of the slot have significant effect on its performance.At normal ventilation,slotting increases the attack angle with zero lift.With the increasing of attack angle,the difference of lift coefficient between slotted and original airfoils will be positive,negative,and then positive;while the difference of drag coefficient will be positive and negative,which is on the contrary for reverse ventilation.For reverse ventilation,slotting will control separation,delay stall,improve performance of airfoil,and enlarged working conditions.However,there is certain bad effect on non-separation condition.Therefore,slotting can improve the performance for reverse ventilation,and make it possible to provide 40% of flow rate for reverse ventilation.

关 键 词：开缝 翼型 轴流风机 反风 

分 类 号：TH432.1[机械工程—机械制造及自动化]