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涡轮转子叶尖泄漏涡涡核稳定性及控制
引用本文:魏佐君,段文华,乔渭阳,刘建,韩品连.涡轮转子叶尖泄漏涡涡核稳定性及控制[J].航空动力学报,2018,33(9):2139-2149.
作者姓名:魏佐君  段文华  乔渭阳  刘建  韩品连
作者单位:1.南方科技大学 力学与航空航天工程系,广东 深圳 518055;华南理工大学 机械与汽车工程学院,广州 510641
摘    要:以GE-E3第一级涡轮转子为研究对象,对转子叶尖泄漏涡涡核破碎特征和稳定性机理进行了分析和归纳。研究表明:叶尖泄漏涡涡核破碎的动力是离心不稳定性;发生失稳后,涡核区域迅速膨胀,形成低速的回流区;涡核的稳定性取决于螺旋因子和逆压梯度两个因素。然后,从涡核稳定性的角度开展了叶尖泄漏损失控制的研究,计算表明:叶尖叶型的负荷前移能够减少叶片尾缘附近间隙内的横向压力梯度;吸力面喉部位置以后型线拉直能够减少喉道后的扩压系数;通过这两个措施生成的新叶片能够有效地减弱叶尖泄漏涡,抑制涡核的不稳定性,减少叶尖泄漏流损失。 

关 键 词:涡轮    叶尖泄漏涡    涡核稳定性    涡核破碎    稳定性控制    气动损失
收稿时间:2017/5/4 0:00:00

Analysis and control of tip-leakage vortex core stability of turbine rotor
Abstract:The feature of tip-leakage vortex breakdown and the stability mechanism were analyzed and summarized using the first-stage rotor blade of GE-E3 turbine. The study indicated that: the breakdown of tip-leakage vortex core was caused by vortexs centrifugal instability; the vortex core expanded rapidly after losing stability and reversed flow was formed; the vortex core stability depended on two factors: swirling number and reversed pressure gradient. After that, the control of tip-leakage loss was carried out from the perspective of vortex core stability. Calculations show that: moving forward the loading of tip blade profile can reduce the pressure gradient; employing straight profile on the suction surface after passage throat can directly decrease the profile diffuse factor; and the redesigned blade by those two methods can obviously weaken the tip-leakage vortex, suppress the instability of vortex core and decrease the tip-leakage losses. 
Keywords:turbine  tip-leakage vortex  vortex-core stability  vortex-core breakdown  stability control  aerodynamic loss
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