涡轮转子叶尖泄漏涡涡核稳定性及控制

魏佐君; 段文华; 乔渭阳; 刘建; 韩品连

doi:10.13224/j.cnki.jasp.2018.09.011

涡轮转子叶尖泄漏涡涡核稳定性及控制

doi: 10.13224/j.cnki.jasp.2018.09.011

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
2.
西北工业大学动力与能源学院,西安 710072
3.
南方科技大学力学与航空航天工程系,广东深圳 518055

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出版历程
- 收稿日期: 2017-05-04
- 刊出日期: 2018-09-28

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

摘要

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。
- 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
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.
- turbine /
- tip-leakage vortex /
- vortex-core stability /
- vortex-core breakdown /
- stability control /
- aerodynamic loss

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