含湿气流单缝冲击冷却数值模拟

谭晓茗; 李业芳; 张靖周

含湿气流单缝冲击冷却数值模拟

南京航空航天大学能源与动力学院,南京 210016

基金项目: 国家自然科学基金(51076063)

计量
- 文章访问数: 1713
- HTML浏览量: 217
- PDF量: 1173
- 被引次数: 0
出版历程
- 收稿日期: 2011-12-27
- 刊出日期: 2013-01-28

Numerical simulation of mist/air cooling in a single slot jet impingement

College of Energy and Power Engineering, Nanjing University of Aeronautics and Astronautics,Nanjing 210016,China

摘要

摘要: 对饱和湿空气夹带液滴的含湿气流单缝冲击冷却进行了数值模拟,比较研究了含湿气流中液滴相变换热/液滴载量比和单缝射流几何参数对强化换热效果的影响,研究发现:气流中液滴的加入对冷却效果的影响十分显著,热流密度为8000W/m²的条件下,空气中注入5%的液滴会比饱和湿空气对驻点区的冷却效果提高90%,当液滴载量比从1%提高到5%,冲击驻点区局部传热系数提高了32%;而合适的缝宽和冲击高度也是影响冷却效果的重要因素,在该条件下冲击高度与缝宽的比值为4.55时冲击冷却效果最佳.
- 含湿气流 /
- 冲击冷却 /
- 相变换热 /
- 单缝 /
- 数值模拟
Abstract: Numerical simulation was carried out on the heat transfer characteristics in a mist/air impinging single slot jet. The effects of phase-changing heat transfer of the water droplets, the mist mass ratio in the air and the geometrical parameters of the slot jet were studied to reveal the enhancement of heat transfer. The simulated results show that adding liquid droplets in an air flow enhances the cooling effect drastically. 90% cooling enhancement at the stagnation point was achieved by injecting 5% of droplets with the heat flux of 8000W/m². When the mist/air mass ratio increases from 1% to 5%, the heat transfer enhancement of the stagnation region is 32%. Proper jet width and impinging height are important parameters for cooling effect. In this study, the best impinging cooling effect was achieved with the impinging height to jet width ratio of 4.55 .
- mist/air /
- impinging cooling /
- phase-change heat transfer /
- single slot /
- numerical simulation

HTML

参考文献(15)

[1]	张靖周,李永康,谭晓茗,等.阵列射流冲击冷却局部对流换热特性的数值计算与实验研究[J].航空学报,2004,25(4):339-342. ZHANG Jingzhou,LI Yongkang,TAN Xiaoming,et al.Numerical computation and experimental investigation on local convective heat transfer characteristics for jet array impingement[J].Acta Aeronautica et Astronautica Sinica,2004,25(4):339-342.(in Chinese)
[2]	谭蕾,张靖周,谭晓茗.非均匀横流作用下冲击射流冷却的数值研究[J].航空动力学报,2006,21(3):528-532. TAN Lei,ZHANG Jingzhou,TAN Xiaoming.Numerical investigation of jet impingement cooling with non-uniform crossflow[J].Journal of Aerospace Power,2006,21(3):528-532.(in Chinese)
[3]	徐国强,谢毅,丁水汀,等.“冲击-气膜”复合式结构冷却效果数值研究[J].热科学与技术,2009,8(1):1-7. XU Guoqiang,XIE Yi,DING Shuiting,et al.Numerical simulation on cooling effectiveness of combined impingement and film cooling[J].Journal of Thermal Science and Technology,2009,8(1):1-7.(in Chinese)
[4]	宋双文,杨卫华,胡好生,等.冲击+逆向对流+气膜冷却传热特性的研究[J].航空动力学报,2007,22(9):1417-1422. SONG Shuangwen,YAN Weihua,HU Haosheng,et al.Experimental study of the heat transfer characteristic of combined cooling of impingement + reversed convection + film[J].Journal of Aerospace Power,2007,22(9):1417-1422.(in Chinese)
[5]	施明恒,白天池.冲击液滴的泡状沸腾换热[J].工程热物理学报,1989,10(2):193-195. SHI Mingheng,BI Tianchi.Boiling heat transfer of jet droplets[J].Journal of Engineering Thermophysics,1989,10(2):193-195.(in Chinese)
[6]	童齐宝,王锁芳.叶片内部蒸汽冷却的数值模拟[J].航空动力学报,2008,23(8):1364-1369. DONG Qibao,WANG Suofang.Numerical simulation of a steam-cooled vane[J].Journal of Aerospace Power,2008,23(8):1364-1369.(in Chinese)
[7]	LI X,Gaddis J L,WANG T.Mist/steam heat transfer in confined slot jet impingement[J].Journal of Turbomachinery,2001,123(1):161-167.
[8]	LI X,Gaddis J L,WANG T.Mist/steam cooling by a row of impinging jets[J].International Journal of Heat and Mass Transfer,2003,46(12):2279-2290.
[9]	LI X,Gaddis J L,WANG T.Modeling of heat transfer in a mist/steam imping jet[J].International Journal of Heat and Mass Transfer,2001,123:1086-1092.
[10]	WANG T,Gaddis J L,LI X.Mist/steam heat transfer of multiple row of impinging jets[J].International Journal of Heat and Mass Transfer,2005,48(25/26):5179-5191.
[11]	WANG T,LI X.Simulation of mist film cooling at gas turbine operating conditions[J].International Journal of Heat and Mass Transfer,2008,51( 21/22):5305-5317.
[12]	安庆龙,傅玉灿,徐九华,等.低温气动喷雾射流冲击冷却技术在钛合金磨削中的应用[J].中国机械工程,2006,17(11):1117-1120. AN Qinglong,FU Yucan,XU Jiuhua,et al.Application of cryogenic pneumatic mist jet impinging in grinding of Ti-6Al-4V[J].Journal of Chinese Mechanical Engineering,2006,17(11):1117-1120.(in Chinese)
[13]	姜澎,黄洪雁,冯国泰,等.水雾/蒸汽相变冲击冷却的数值模拟[J].哈尔滨工程大学学报,2009,30(10):1098-1102. JIANG Peng,HUANG Hongyan,FENG Guotai,et al.Numerically simulating mist/steam impingement cooling with phase change[J].Journal of Harbin Engineering University,2009,30(10):1098-1102.(in Chinese)
[14]	WANG T,Dhanasekaran T S.Calibration of a computational model to predict mist/steam impinging jets cooling with an application to gas turbine blades[J].International Journal of Heat and Mass Transfer,2010,132(12):122401.1-1122401.11.
[15]	Flunet Inc.FLUENT user's guide[M].Lebanon,NH:Flunet Inc.,2004.