某超高负荷低压涡轮叶型气动性能分析
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摘要
针对某系列Zweifel数约为1.6的超高负荷低压涡轮叶型,分别对其在定常来流条件下、上游尾迹扫掠条件下的二维流动开展了数值研究.计算结果表明,在低雷诺数、低湍流度工作环境下,叶片吸力面存在较大层流分离,且前加载叶型二维气动性能优于后加载叶型.同时,上游尾迹扫掠对超高负荷低压涡轮叶型分离流动控制作用有限,需引入新的流动控制方法.研究结果对超高负荷低压涡轮设计有较好的启示.
Two ultra-high lifted low-pressure turbine(LPT) profile with Zweifel lift coefficient of approximately 1.6 are numerically studied at steady and unsteady inflow conditions. The results show that there is always a layer separation bubble located at airfoil suction side for the condition of low Reynolds number and low turbulence intensity. The frond-loaded airfoil is proved to have better profile performance. Besides, the inhabiting effect of unsteady wake to flow separation is insufficient for the ultra-high lifted low-pressure turbine profile and new flow control methods is suggested here.The investigation is believed to be useful to the design of ultra-high lifted low-pressure turbine profile.
Two ultra-high lifted low-pressure turbine(LPT) profile with Zweifel lift coefficient of approximately 1.6 are numerically studied at steady and unsteady inflow conditions. The results show that there is always a layer separation bubble located at airfoil suction side for the condition of low Reynolds number and low turbulence intensity. The frond-loaded airfoil is proved to have better profile performance. Besides, the inhabiting effect of unsteady wake to flow separation is insufficient for the ultra-high lifted low-pressure turbine profile and new flow control methods is suggested here.The investigation is believed to be useful to the design of ultra-high lifted low-pressure turbine profile.
引文
[1] Hodson H P, Howell R J. The role of Transition in HighLift Low-Pressure Turbines for Aero-Engines[J]. Progress in Aerospace Sciences, 2005, 41:419-454
[2] Howell R J, Ramesh O N, Hodson H P, et al. High Lift and aft Loaded Profiles for Low Pressure Turbines[J]. ASME Journal of Turbomachinery, 2001, 124(2):385-392
[3] Haselbach F, Schiffer H P, Horsman M, et al. The Application of Ultra High Lift Blade in the BR715 LP Turbine[J]. ASME Journal of Turbomachinery,2002, 124(1):45-51
[4] Zhu Junqiang, Sjolander S A. Improved Profile Loss and Deviation Correlations for Axial Turbine Blade Rows[R].ASME Paper GT-2005-69077, 2005
[5] Popovic I, Zhu Junqiang, Dai Wu, et al. Aerodynamics of a Family of Three Highly-loaded Low-pressure Turbine Airfoils:Measured Effects of Reynolds Number and Turbulence Intensity in Steady Flow[R]. ASME Paper GT-2006-91271, 2006
[6] Denton J D. Loss Mechanisms in Turbomachines[R].ASME 93-GT-435, 1993
[7] Mayle R E. The Role of.Laminar-Turbulent Transition in Gas Turbine Engines[J]. ASME Journal of Turbomachinery, 1991, 113:509-536
[8] Crabtree L F. The Formation of Regions of Separated Flow on Wing Surface. Part II Laminar Separation Bubble and the Mechanism of Leading Edge Stall[R]. RAE Report Aero 2578, 1959
[9]李伟.上游尾迹扫掠下超高负荷低压涡轮边界层特性研究[D].北京,中国科学院研究生院,2012
[10] Bons J P, Sondergaard R, Rivir R B. Turbine Separation Control Using Pulsed Vortex Generator Jets[J]. ASME Journal of Turbomachinery, 2001, 123(2):198-206
[11] Zhang X F, Vera M, Hodson H P, et al. Separation and Transition Control on an aft-Loaded Ultra-High-Lift LP Turbine Blade at Low Reynolds Numbers:Low-Speed Investigation[R]. ASME Paper 2005-GT-68892, 2005
[2] Howell R J, Ramesh O N, Hodson H P, et al. High Lift and aft Loaded Profiles for Low Pressure Turbines[J]. ASME Journal of Turbomachinery, 2001, 124(2):385-392
[3] Haselbach F, Schiffer H P, Horsman M, et al. The Application of Ultra High Lift Blade in the BR715 LP Turbine[J]. ASME Journal of Turbomachinery,2002, 124(1):45-51
[4] Zhu Junqiang, Sjolander S A. Improved Profile Loss and Deviation Correlations for Axial Turbine Blade Rows[R].ASME Paper GT-2005-69077, 2005
[5] Popovic I, Zhu Junqiang, Dai Wu, et al. Aerodynamics of a Family of Three Highly-loaded Low-pressure Turbine Airfoils:Measured Effects of Reynolds Number and Turbulence Intensity in Steady Flow[R]. ASME Paper GT-2006-91271, 2006
[6] Denton J D. Loss Mechanisms in Turbomachines[R].ASME 93-GT-435, 1993
[7] Mayle R E. The Role of.Laminar-Turbulent Transition in Gas Turbine Engines[J]. ASME Journal of Turbomachinery, 1991, 113:509-536
[8] Crabtree L F. The Formation of Regions of Separated Flow on Wing Surface. Part II Laminar Separation Bubble and the Mechanism of Leading Edge Stall[R]. RAE Report Aero 2578, 1959
[9]李伟.上游尾迹扫掠下超高负荷低压涡轮边界层特性研究[D].北京,中国科学院研究生院,2012
[10] Bons J P, Sondergaard R, Rivir R B. Turbine Separation Control Using Pulsed Vortex Generator Jets[J]. ASME Journal of Turbomachinery, 2001, 123(2):198-206
[11] Zhang X F, Vera M, Hodson H P, et al. Separation and Transition Control on an aft-Loaded Ultra-High-Lift LP Turbine Blade at Low Reynolds Numbers:Low-Speed Investigation[R]. ASME Paper 2005-GT-68892, 2005