Experiment on heat transfer characteristics inside the casing of high pressure turbine with active clearance control
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摘要: 针对高压涡轮叶尖主动间隙控制(ACC)机匣中的典型换热结构,利用试验研究了多层机匣结构中内斜向冲击射流的局部换热特征,重点分析了进口雷诺数(10000~24000)、冲击孔入射角度(30°,45°,60°)、冲击孔直径(1.0,1.5,2.0mm)等参数对带肋机匣表面局部和平均传热系数的影响规律.研究中发现加强肋的存在显著影响了机匣表面局部传热系数,同时由于冲击射流局部强化换热作用,多层机匣内表面不同位置的传热系数相差很大.试验结果表明:随着冷气进口雷诺数的增加,机匣加强肋表面局部和平均传热系数均提高.在研究参数范围内,冲击孔直径为2.0mm,孔数为23的情况下能够获得最佳的换热效果;相比30°和60°冲击孔入射角度,冲击孔入射角度为45°能获得更好的换热效果.
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关键词:
- 主动间隙控制 (ACC) /
- 高压涡轮机匣 /
- 斜向冲击 /
- 换热特性 /
- 热膜法
Abstract: According to a typical heat transfer structure of the casing of a high pressure turbine with active clearance control system,experiments were conducted to investigate the local heat transfer characteristics of a mutillayer casing structure.In the experiments,the inlet Reynolds number (10000-24000),the angle of jet impingement (30°,45°,60°) and the diameter of jet impingement hole (1.0,1.5,2.0mm) were changed to investigate the local and average heat transfer coefficients of the casing surface with ribs.It was found that the existence of the ribs affected the local heat transfer coefficient of the casing surface significantly.At the same time,due to the local heat transfer enhancement by the jet impingement,the heat transfer coefficient of the casing inner surface varied considerably at different locations.The results show that the local and average heat transfer coefficients are improved with the increasing inlet Reynolds number of cold air.Within the range of research parameters,maximum heat transfer can be obtained when the diameter of the jet holes is 2mm and the number of jet holes is 23.Compared with the angle of jet impingement 30° and 60°,45 ° can result in higher heat transfer rate. -
[1] Lattime S B, Steinetz B M.High-pressure-turbine clearance control systems:current practices and future directions[J].Journal of Propulsion and Power, 2004, 20(2):302-311. [2] 张清华.发动机叶尖间隙技术[J].国际航空, 1987(2):37-38. ZHANG Qinghua.Technology of turbine tip clearance[J].International Aviation, 1987(2):37-38.(in Chinese) [3] Knipser C, Horm W, Staudachers.Aircraft engine performance improvement by active clearance control in low pressure turbines[R].ASME Paper GT2009-59301, 2009. [4] Rasipuram S C, Nasr K J.A numerically-based parametric study of heat transfer off an inclined surface subject to impinging airflow[J].International Journal of Heat and Mass Transfer, 2004, 47(23):4967-4977. [5] Lee C H, Lim K B, Lee S H, et al.A study of the heat transfer characteristics of turbulent round jet impinging on an inclined concave surface using liquid crystal transient method[J].Experimental Thermal and Fluid Science, 2007, 31(6):559-565. [6] Dong L L, Leung C W, Cheung C S.Heat transfer characteristics of premixed butane/air flame jet impinging on an inclined flat surface[J].Heat and Mass Transfer, 2002, 39(1):19-26. [7] Roy S, Patel P.Study of heat transfer for a pair of rectangular jets impinging on an inclined surface[J].International Journal of Heat and Mass Transfer, 2003, 46(3):411-425. [8] 毛军逵, 刘震雄, 郭文.小间距单孔冲击凸面靶板流场结构试验[J].航空动力学报, 2007, 22(10):1599-1603. MAO Junkui, LIU Zhenxiong, GUO Wen.Experimental investigations on round jet impingement on flow structures of convex surface target with narrow space[J].Journal of Aerospace Power, 2007, 22(10):1599-1603.(in Chinese) [9] 刘震雄.小冲击间距比下柱型曲面冲击流动与换热特性试验研究[D].南京:南京航空航天大学, 2006. LIU Zhenxiong.Experimental investigations on flow and heat transfer characteristics of cylindrical surface with little impact spacing ration[D].Nanjing:Nanjing University of Aeronautics and Astronautics, 2006.(in Chinese) [10] 顾维藻, 神家锐, 马重芳, 等.强化传热[M].北京:科学出版社, 1990. [11] Jambunathan A S.Numerical prediction of semi-confined jet impingement and comparison with experimental data[J].International Journal for Numerical Methods in Fluids, 1996, 23(3):295-306. [12] Cooper D, Jackson D C, Launder B E, et al.Impinging jet studies for turbulence model assessment:I flow field experiments[J].International Journal of Heat Mass Transfer, 1993, 36(10):2675-2684. [13] 李藤, 刘静.芯片冷却技术的最新进展及其评价[J].制冷学报, 2004, 25(3):22-32. LI Teng, LIU Jing.The latest progress of and evaluation of the chip cooling technology[J].Journal of Refrigeration, 2004, 25(3):22-32.(in Chinese) [14] Bergles A E.Evolution of cooling technology for electrical, electronic, and microelectronic equipment[J].Transactions on Components and Packaging Technologies, 2003, 26(1):6-15. [15] 乔剑.涡轮叶尖间隙主动控制机匣内部流动与换热特性研究[D].南京:南京航空航天大学, 2011. QIAO Jian.A study on flow and heat transfer characteristics of casing internal by active control of turbine tip clearance[D].Nanjing:Nanjing University of Aeronautics and Astronautics, 2011.(in Chinese)
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