高压涡轮转子间隙泄漏流动的非定常特征研究

王大磊; 朴英; 陈美宁

高压涡轮转子间隙泄漏流动的非定常特征研究

清华大学航天航空学院, 北京 100084

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出版历程
- 收稿日期: 2011-11-14
- 刊出日期: 2012-11-28

Study of unsteady tip leakage flow characteristic in high pressure turbine stage

School of Aerospace, Tsinghua University, Beijing 100084, China

摘要

摘要: 利用数值方法求解三维非定常雷诺平均Navier-Stokes方程模拟某跨声速高压涡轮流场,研究了某跨声速高压涡轮流场的非定常特征,通过详细分析动静干涉对间隙泄漏流动的影响,进一步明确了泄漏流周期性变化的规律和成因.研究发现:静子尾缘燕尾波的外侧分支外尾波是间隙内部流动结构变化的主要原因,间隙泄漏涡的周期性变化则受外尾波和尾迹的共同影响.外尾波深入转子通道内部周期性经过间隙,在间隙前缘附近产生很强的逆压梯度,使间隙前部流动方向明显改变而产生大范围分离.外尾波导致间隙泄漏流量明显增加并周期性震荡.在静子尾迹和外尾波共同作用下,泄漏涡强度出现波动且涡的位置前后移动,使泄漏涡呈现明显的非定常性.
- 航空发动机 /
- 涡轮 /
- 间隙泄漏流 /
- 非定常 /
- 数值模拟
Abstract: Three-dimensional time-dependent Reynolds averaged Navier-Stokes equations were solved to investigate the unsteady tip leakage flow in a transonic high pressure turbine stage.The changing rules of tip leakage flow as well as the reasons were indicated based on the study of the effect of stator trailing edge wake and shock waves.Results show that the outboard branch of the waves causes the periodic modification of the flow inside the tip clearance,while the stator trailing edge wake and wave make the leakage vortex changes together.The shock wave goes deep into the passage of the rotor and passes through the tip clearance periodically.When the shock wave passes the tip clearance,a strong adverse pressure gradient appears nearby the leading edge of the clearance.In addition due to the adverse pressure gradient, the separation bubble grows and a separation phenomenon appears at the forepart of the tip clearance.Meanwhile,the leakage flowmass increases and reverberates as the result of the shock wave.Because of the effect of both stator trailing edge wave and shock waves,the strength of the vortex attains to a momentary peak value,and the location of the leakage vortex moves front and back,and both of the phenomena indicate that the leakage flow is marked unsteady.
- aero-engine /
- turbine /
- tip leakage flow /
- unsteady /
- numerical simulation

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参考文献(17)

[1]	Gümmer V,Goller M,Swoboda M.Numerical investigation of endwall boundary layer removal on highly-loaded axial compressor blade rows [R].ASME Paper GT-2005-68699,2005.
[2]	Rao N M,Camci C.Axial turbine tip desensitization by injection from a tip trench:Part 1 effect of injection mass flow rat [R].ASME Paper GT-2004-53256,2004.
[3]	Rao N M,Camci C.Axial turbine tip desensitization by injection from a tip trench:Part 2 leakage flow sensitivity to injection location [R].ASME Paper GT-2004-53258,2004.
[4]	Moore J,Tilton J S.Tip leakage flow in a linear turbine cascade[J].ASME Journal of Turbomachinery,1988,110(1):18-26.
[5]	Bindon J P.The measurement and formation of tip clearance loss[J].ASME Journal of Turbomachinery,1989,111(3):257-263.
[6]	Yamamoto A.Endwall flow/loss mechanisms in a linear turbine cascade with blade tip clearance[J].ASME Journal of Turbomachinery,1989,111(2):246-275.
[7]	XIAO Xinwen,McCarter A A.Tip clearance effects in a turbine rotor:PartⅠ pressure field and loss[J].Journal of Turbomachiney,2001,123(2):296-304.
[8]	McCarter A A,XIAO Xinwen.Tip clearance effects in a turbine rotor flow:PartⅡ velocity field and physics[J].Journal of Turbomachiney,2001,123(2):305-313.
[9]	XIAO Xinwen.Investigation of tip clearance flow physics in axial flow turbine rotors [D].Pennsylvania:The Pennsylvania State University,2000.
[10]	许开福,乔渭阳.涡轮叶尖间隙流动的数值模拟[J].热能动力工程,2009.24(4):432-436. XU Kaifu,QIAO Weiyang.Numerical simulation of turbine blade tip leakage flows[J].Jouranl of Engineering for Theamal Energy and Power,2009,24(4):432-436.(in Chinese)
[11]	祁明旭,丰镇平.透平动叶顶部间隙流的表现形式及其对透平性能的影响[J].西安交通大学学报,2005,39(3):244-246. QI Mingxu,FENG Zhenping.Representation formation of tip clearance flow and influence on turbine performance[J].Journal of Xi'an Jiaotong University,2005,39(3):244-246.(in Chinese)
[12]	祁明旭,丰镇平.透平动叶顶部间隙流的端壁二次流结构研究[J].西安交通大学学报,2005,39(5):445-449. QI Mingxu,FENG Zhenping.Study on tip clearance flow of turbine blade-endwall secondary flow structure[J].Journal of Xi'an Jiaotong University,2005,39(5):445-449.(in Chinese)
[13]	Prasad A,Wagner J.Unsteady effects in turbine tip clearance flows[J].Journal of Turbomachinery,2000,122(4):621-627.
[14]	Hassanvand M,WANG Songtao,FENG Guotai,et al.Unsteady simulation and investigation of tip leakage flow based on dissipation function [R].ASME Paper GT-2004-54283.
[15]	Phutthavong P,Hassan I.Unsteady numerical investigation of blade tip leakage: Part 2 time-dependent parametric study[J].Jouranl of Thermophysics and Heat Transfer,2008,22(3):474-484.
[16]	SUN Hao,LI Jun,FENG Zhenping.Effects of tip clearance on unsteady flow characteristics in an axial turbine stage [R].ASME Paper GT-2009-59828.
[17]	Rahman M H,Kim S I,Hassan I,et al.Unsteady tip leakage flow characteristics and heat transfer on turbine blade tip and case [R].ASME Paper GT-2010-22104,2010.