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第1期 张少军等：喷雾冷却中射流出口高度和高温钢板表面温度对换热系数的影响 .69. 0.7f 1.2 (a) 1.1 (b) 0.6 表面温度 表面温度 -1050K 0.9 0.5 1100K (日 -1180K -·1150K -】143K 0.4 0.7 +-1200K -1100K -.1053K 0.3 0.5 0.2 00 100 200300 400 500 0.10 100 200300 400500 距驻点位置/mm 距驻点位置mm 图3钢板表面温度对换热系数的影响 Fig.3 Effect of surface temperature on heat transfer coefficient 由图3可知，在其他参数一定的情况下，随着钢 呈现减小趋势，但变化较小. 板表面温度（在1050~1200K范围内）提高，换热 系数整体呈现减小趋势，但变化较小，原因是温度 参考文献 较高时高温钢板表面将形成稳定的蒸汽层，而有足 [1】毛希澜.换热器设计·上海：上海科学技术出版社，1988 [2]Dano B P E.Liburdy J A.Kanokjaruvijit K.Flow characteristics 够能量穿过蒸汽层的雾滴数量有限，而且随着钢板 and heat transfer performances of a semi-confined impinging array 表面温度的提高，蒸汽层的厚度也在增加 of jets:effect of nozzle geometry.Int J Heat Mass Transfer, 但换热系数随钢板表面温度的提高呈现减小趋 2005.48,691 势的规律也不是绝对的，有一定的局部波动性，造 [3]陈庆光，徐忠，张永建，湍流冲击射流流动与传热的数值研究 成这种局部波动的原因与喷射距离对换热系数的影 进展.力学进展，2002(2)：92 响中局部波动的原因一致· [4]Stevens J.Pan Y,Webb B W.Effect of nozzle configuration on transport in the stagnation zone of axisymmetric,impinging free- 3结论 surface liquid jets:part Iturbulent flow structure.Trans ASME J Heat Transfer.1992.114:875 (1)在射流核范围外，其他参数固定不变的情 [5]Pan Y,Stevens J.Webb B W.Effect of nozzle configuration on 况下，随着喷射距离（在200~500mm范围内）减 transport in the stagnation zone of axisymmetric.impinging free 小，换热系数整体呈现增加趋势 surface liquid jets:part 2ocal heat transfer.Trans ASME J Heat Transfer,1992,114:880 (2)在其他参数不变的情况下，随钢板表面温 [6]陶文铨.数值传热学.2版.西安：西安交通大学出版社，2001 度（在1050~1200K范围内）增加，换热系数整体 Effects of surface to nozzle distance and high temperature plate s surface tempera ture on spray cooling heat transfer coefficient ZHA NG Shaojun,BIA N Zhihui),YANG Chunyan2),SHAN Yanhua) 1)Mechanical Engineering School,University of Science and Technology Beijing.Beijing 100083.China 2)Engineering Institute of Chemical Defence.Bejing 102205,China ABSTRACI Spray cooling of a high temperature steel plate was simulated by using finite element method.The effects of surface to-nozzle distance and steel plate s surface temperature on spray cooling heat transfer coefficient were analyzed.The simulation results show that on condition that other parameters retain constant,the heat transfer coefficient increases totally with decreasing jet space(200500mm)and decreases totally with the sur- face temperature increasing when the surface temperature of the plate in 1050~1200 K. KEY WORDS steel plate;controlled cooling;spray cooling;heat transfer coefficient;jet impingement;nu- merical simulation图3 钢板表面温度对换热系数的影响 Fig．3 Effect of surface temperature on heat transfer coefficient 由图3可知在其他参数一定的情况下随着钢 板表面温度（在1050～1200K 范围内）提高换热 系数整体呈现减小趋势但变化较小．原因是温度 较高时高温钢板表面将形成稳定的蒸汽层而有足 够能量穿过蒸汽层的雾滴数量有限而且随着钢板 表面温度的提高蒸汽层的厚度也在增加． 但换热系数随钢板表面温度的提高呈现减小趋 势的规律也不是绝对的有一定的局部波动性．造 成这种局部波动的原因与喷射距离对换热系数的影 响中局部波动的原因一致． 3 结论 （1） 在射流核范围外其他参数固定不变的情 况下随着喷射距离（在200～500mm 范围内）减 小换热系数整体呈现增加趋势． （2） 在其他参数不变的情况下随钢板表面温 度（在1050～1200K 范围内）增加换热系数整体 呈现减小趋势但变化较小． 参 考 文 献 ［1］ 毛希澜．换热器设计．上海：上海科学技术出版社1988 ［2］ Dano B P ELiburdy J AKanokjaruvijit K．Flow characteristics and heat transfer performances of a sem-i confined impinging array of jets：effect of nozzle geometry．Int J Heat Mass Transfer 200548：691 ［3］ 陈庆光徐忠张永建．湍流冲击射流流动与传热的数值研究 进展．力学进展2002（2）：92 ［4］ Stevens JPan YWebb B W．Effect of nozzle configuration on transport in the stagnation zone of axisymmetricimpinging freesurface liquid jets：part 1-turbulent flow structure．Trans ASME J Heat Transfer1992114：875 ［5］ Pan YStevens JWebb B W．Effect of nozzle configuration on transport in the stagnation zone of axisymmetricimpinging freesurface liquid jets：part2-local heat transfer．Trans ASME J Heat Transfer1992114：880 ［6］ 陶文铨．数值传热学．2版．西安：西安交通大学出版社2001 Effects of surface-to-nozzle distance and high-temperature plate’s surface temperature on spray cooling heat transfer coefficient ZHA NG Shaojun 1）BIA N Zhihui 1）Y A NG Chunyan 12）SHA N Y anhua 1） 1） Mechanical Engineering SchoolUniversity of Science and Technology BeijingBeijing100083China 2） Engineering Institute of Chemical DefenceBejing102205China ABSTRACT Spray cooling of a high-temperature steel plate was simulated by using finite element method．The effects of surface-to-nozzle distance and steel plate’s surface temperature on spray cooling heat transfer coefficient were analyzed．The simulation results show that on condition that other parameters retain constantthe heat transfer coefficient increases totally with decreasing jet space （200～500mm） and decreases totally with the surface temperature increasing when the surface temperature of the plate in1050～1200K． KEY WORDS steel plate；controlled cooling；spray cooling；heat transfer coefficient；jet impingement；numerical simulation 第1期 张少军等： 喷雾冷却中射流出口高度和高温钢板表面温度对换热系数的影响 ·69·