斜向冲击强化换热特性试验

单文娟; 毛军逵; 李毅; 沈毅

斜向冲击强化换热特性试验

1.
南京航空航天大学能源与动力学院南京 210016
2.
中国航空工业集团公司沈阳发动机设计研究所内流与传热研究室沈阳 110000

基金项目: 航空推进验证计划

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出版历程
- 收稿日期: 2012-04-14
- 刊出日期: 2013-03-28

Experiment on heat transfer characteristics with inclined impingement

1.
College of Energy and Power Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China
2.
Internal Flow and Heat Transfer Laboratory, Shenyang Engine Design and Research Institution, Aviation Industry Corporation of China, Shenyang 110000, China

摘要

摘要: 针对某型发动机主动间隙控制系统中典型冷却结构——45°斜向射流冲击,利用热膜法和红外热像仪测试技术,开展了局部强化冷却特性试验研究,分析了冲击雷诺数Re(33297～83242)、斜向冲击间距比H/d (2～6)等参数对冲击靶板表面局部换热特性参数Nu及Nu的影响.试验中发现位于驻点处和下游附驻点区出现了两个Nu峰值,当冲击Re较大、斜向冲击间距比H/d较小时,该现象尤为突出.试验结果表明:随着冲击Re的增大,靶板局部强化换热效果显著提升,Nu和Nu均显著增强;随着H/d的减小,驻点区域局部强化换热效果逐步提升,但增加幅度微弱;而在远离驻点区域,特别是在第二个峰值位置,冲击间距减小使得冲击强化换热效果明显增强.
- 传热 /
- 斜向冲击 /
- 平面靶板 /
- 试验研究 /
- 红外热像仪 /
- 双峰值
Abstract: Experiments were conducted to investigate the heat transfer characteristics of a typical cooling structure of blade tip clearance active control system with 45 degree inclined impingement.In experiments,jet Reynolds number Re(33297～83242) and the ratio of jet impingement distance to the diameter of the jet hole H/d(2～6) were changed.Heated foil and infrared thermal imaging technology were used to investigate the local Nu(Nusselt number) and Nu(average Nusselt number) by varying those parameters.It was found that there existed two peaks of heat transfer coefficient along the jet line,located at the main and secondary stagnation points respectively.The two peaks were more evident in larger Re and smaller H/d cases.The experimental results show that the flow characteristics are significantly strengthened with the increase of Re increasing,which results in much larger Nu and Nu.With H/d decrease,the local heat transfer at the main stagnation point increases faintly,meanwhile,the local heat transfer at the secondary stagnation point is enhanced greatly.
- heat transfer /
- inclined impingement /
- flat surface /
- experimental analysis /
- infrared camera /
- two peaks

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参考文献(16)

[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]	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.Research on flow and heat transfer characteristics in turbine tip active clearance control case[D].Nanjing:Nanjing University of Aeronautics and Astronautics,2011.(in Chinese)
[3]	顾维藻,神家锐,马重芳,等.强化传热[M].北京:科学出版社,1990.
[4]	Ashforth-frost S,Jambunathan K.Numerical prediction of semi-confined jet impingement and comparison with experimental data[J].International Journal for Numerical Methods in Fluids,1996,23(3):295.
[5]	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):26-75.
[6]	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(3):22-32. LI Teng,LIU Jing.The latest progress of and evaluation of the chip cooling technology[J].Journal of Refrigeration,2004(3):22-32.(in Chinese)
[7]	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.
[8]	Al-aqal Osama M A.Heat transfer distributions on the walls of a narrow channel with jet impingement and cross flow[D].Pittsburgh:University of Pittsburgh,1999.
[9]	Gardon R,Akfirat J C.The role of turbulence in determining the heat transfer characteristics of impinging jets[J].International Journal of Heat Mass Transfer,1965,8(10):1261-1272.
[10]	张永恒,周勇,王良璧.圆形冲击射流传热性能的实验研究[J].热科学与技术,2006,5(1):38-43. ZHANG Yongheng,ZHOU Yong,WANG Liangbi.Experimental investigations for the heat transfer characteristics with round impingement[J].Journal of Thermal Science and Technology,2006,5(1):38-43.(in Chinese)
[11]	Goldstein R J,Franehett M E.Heat transfer from a flat surface to an oblique impinging jet[J].Journal of Heat Transfer,1988,110(2):84-90.
[12]	ODonovan T S,Murray D B.Fluctuating fluid flow and heat transfer of an obliquely impinging air jet[J].International Journal of Heat and Mass Transfer,2008,51(25/26):6169-6179.
[13]	陈庆光,徐忠,吴玉林,等.平面倾斜冲击射流场的数值分析[J].工程热物理学报,2005,26(2):237-239. CHEN Qingguang,XU Zhong,WU Yulin,et al.Numerical analysis of a planar oblique impinging jet floe field[J].Journal of Engineering Thermophysics,2005,26(2):237-239.(in Chinese)
[14]	沈瑾,缪国君,毛军逵.小冲击间距下带倾角冲击凹柱面流场结构实验研究[J].推进技术,2010,31(2):187-192. SHEN Jin,MIAO Guojun,MAO Junkui.Experimental investigations for the flow structures on the concave surface with inclined impingement in small distance[J].Journal of Propulsion Technology,2010,31(2):187-192.(in Chinese)
[15]	Beitelmal A H,Saad M A,Patel C D.The effect of inclination on the heat transfer between a flat surface and an impinging two-dimensional air jet[J].International Journal of Heat and Fluid Flow,2000 21(2):156-163.
[16]	秦曼,郑青,马重芳,等.FC-72圆形射流冲击模拟电子芯片单相局部对流传热的实验研究[J].工程热物理学报,1996,17(1):69-74. QIN Man,ZHENG Qing,MA Chongfang,et al.Experimental studies of local characteristics of heat transfer from a simulated microeletronic chip to an impinging circular dielectric liquid jet[J].Journal of Engineering Thermophysics,1996,17(1):69-74.(in Chinese)