涡轮转子叶尖泄漏涡涡核稳定性及控制  

Analysis and control of tip-leakage vortex core stability of turbine rotor

作　　者：魏佐君 段文华[3] 乔渭阳[3] 刘建[3] 韩品连 WEI Zuojun;DUAN Wenhua;QIAO Weiyang;LIU Jian;HAN Pinlian(Department of Mechanics and Aerospace Engineering,Southern University of Science and Technology,Shenzhen Guangdong 518055,China;School of Mechanical and Automotive Engineering,South China University of Technology,Guangzhou 510641,China;School of Power and Energy,Northwestern Polytechnical University,Xi＇an 710072,China)

机构地区：[1]南方科技大学力学与航空航天工程系,广东深圳518055 [2]华南理工大学机械与汽车工程学院,广州510641 [3]西北工业大学动力与能源学院,西安710072

出　　处：《航空动力学报》2018年第9期2139-2149,共11页Journal of Aerospace Power

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。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.

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 

分 类 号：V231.3[航空宇航科学与技术—航空宇航推进理论与工程]