扰流柱形状对冲击冷却综合换热效率影响研究
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摘要
为研究不同形状的扰流柱对冲击冷却系统的影响,对具有菱形、正方形、圆形以及椭圆形扰流柱的冲击冷却进行数值模拟研究,获得了射流Re在1×10~4～3×10~4内冲击靶板的换热特性以及通道内部流场的流动特征,分析冲击射流与不同形状的扰流柱之间的作用机理,并且为了综合考虑换热效果与流动阻力,使用综合换热效率来评价扰流柱在冲击冷却中的作用。研究结果表明:在冷却空气入口条件相同的情况下,菱形扰流柱靶板具有最高的平均努塞尔数Nu以及流动阻力,相比于正方形、圆形和椭圆形扰流柱,Nu分别提高了3.8%,8.9%,10.4%,流动阻力分别提高了9.6%,17.1%,21.3%。圆形扰流柱靶板的综合换热效率相比于菱形、正方形和椭圆形扰流柱分别提高了10.8%,4.9%,1.7%。扰流柱在冲击冷却中所起不同作用的主要原因是其与冲击射流作用后产生涡流的情况及其阻挡横流的能力。当综合考虑换热效果与流动阻力时,在所研究的4种扰流柱形状中,圆形扰流柱是最佳的选择。
In order to investigate the influence of impingement cooling system with different pin-fins, numerical simulation were conducted on impingement cooling with diamond, cubic, circular and elliptic pin fins to obtain the heat transfer characteristic and flow structure for the jet Reynolds ranging from 1×10~4 to 3×10~4, and the interaction between impinging jet and different pin-fins was analyzed. In order to consider the heat transfer and pressure loss together, efficiency index was used to evaluate the effect of pin fins in the impingement cooling system. The results show that the target plate with the diamond pin fins has the best heat transfer efficiency and the highest friction factor in the same cooling air inlet conditions. Comparing to the cubic, circular and elliptic pin fins,the overall averaged Nusselt number Nu of the target plate with diamond pin fins can increase by 3.8%,8.9%, 10.4%, and the friction factor can increase by 9.6%, 17.1%, and 21.3%. The efficiency index of the target plate with circular pin fins can increase by 10.8%, 4.9%, 1.7%, comparing to the diamond, cubic and elliptic pin fins. The different effect between the impingement cooling with different pin-fins is mainly due to the situation of vortex generation and ability to reduce crossflow. Considering the trade-offs between heat transfer and friction factor, the circular pin fins can be the best choice among the shapes studied.
In order to investigate the influence of impingement cooling system with different pin-fins, numerical simulation were conducted on impingement cooling with diamond, cubic, circular and elliptic pin fins to obtain the heat transfer characteristic and flow structure for the jet Reynolds ranging from 1×10~4 to 3×10~4, and the interaction between impinging jet and different pin-fins was analyzed. In order to consider the heat transfer and pressure loss together, efficiency index was used to evaluate the effect of pin fins in the impingement cooling system. The results show that the target plate with the diamond pin fins has the best heat transfer efficiency and the highest friction factor in the same cooling air inlet conditions. Comparing to the cubic, circular and elliptic pin fins,the overall averaged Nusselt number Nu of the target plate with diamond pin fins can increase by 3.8%,8.9%, 10.4%, and the friction factor can increase by 9.6%, 17.1%, and 21.3%. The efficiency index of the target plate with circular pin fins can increase by 10.8%, 4.9%, 1.7%, comparing to the diamond, cubic and elliptic pin fins. The different effect between the impingement cooling with different pin-fins is mainly due to the situation of vortex generation and ability to reduce crossflow. Considering the trade-offs between heat transfer and friction factor, the circular pin fins can be the best choice among the shapes studied.
引文
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[2]Martin H.Heat and Mass Transfer Between Impinging Gas Jets and Solid Surfaces[J].Advances in Heat Transfer,1977,13(1):1-60.
[3]Han B,Goldstein R J.Jet-Impingement Heat Transfer in Gas Turbine Systems[J].Annals News York Acdemy of Science,2001,934(1):147-161.
[4]Hollworth B R,Cole G H.Heat Transfer to Arrays of Impinging Jets in a Crossflow[J].Journal of Turbomachinery,1987,109(4):564-571.
[5]Ligrani P M,Ren Z,Buzzard W C.Impingement Jet Array Heat Transfer with Small-Scale Cylinder Target Surface Roughness Arrays[J].International Journal of Heat&Mass Transfer,2016,107:895-905.
[6]El-Gabry L A,Kaminski D A.Experimental Investigation of Local Heat Transfer Distribution on Smooth and Roughened Surfaces Under an Array of Angled Impinging Jets[J].Journal of Turbomachinery,2005,127(3):532-544.
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[11]张丽,朱惠人,刘松龄,等.短扰流柱排端壁的平均换热实验[J].推进技术,2008,29(5):523-526.(ZHANG Li,ZHU Hui-ren,LIU Song-ling,et al.Experiments on Heat Transfer in Trapezoidal Channel with Short Pin-Fin Arrays[J].Journal of Propulsion Technology,2008,29(5):523-526.)
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[13]周明轩,薛树林,贺宜红,等.高阻塞比肋化通道对流换热特性实验研究[J].推进技术,2018,39(2):335-341.(ZHOU Ming-xuan,XUE Shu-lin,HE Yihong.Experimental Investigation on Convective Heat Transfer Characteristics of High Blockage Ribs Channel[J].Journal of Propulsion Technology,2018,39(2):335-341.)
[14]Chyu M K.Heat Transfer and Pressure Drop for Short Pin-Fin Arrays with Pin-Endwall Fillet[J].Journal of Heat Transfer,1990,112(4):926-932.
[15]Chyu M K,Hsing Y C,Natarajan V.Convective Heat Transfer of Cubic Fin Arrays in a Narrow Channel[J].Journal of Turbomachinery,1998,120(2):181-183.
[16]Chyu M,Yen C,Siw S.Comparison of Heat Transfer from Staggered Pin Fin Arrays with Circular,Cubic and Diamond Shaped Elements[R].ASME GT 2007-28306.
[17]Siw S C,Fradeneck A D,Chyu M K,et al.The Effects of Different Pin-Fin Arrays on Heat Transfer and Pressure Loss in a Narrow Channel[R].ASME GT 2015-43855.
[18]饶宇,万超一,陈鹏.具有针肋的狭窄空间冲击冷却实验和数值计算[J].航空动力学报,2016,31(8):1852-1859.
[19]万超一,饶宇,陈鹏.狭窄通道具有针肋的表面冲击冷却实验研究[J].工程热物理学报,2016,V37(9):2000-2005.
[20]闫建坤,郭涛,朱惠人,等.微尺度阵列射流冲击结构换热特性实验研究[J].推进技术,2016,37(9):1681-1687.(YAN Jian-kun,GUO Tao,ZHU Huiren,et al.Experimental Investigation of Heat Transfer Characteristics on Micro-Scale Array Jet Impingement[J].Journal of Propulsion Technology,2016,37(9):1681-1687.
[21]Yu Rao,Peng Cheng,Chaoyi Wan.Experimental and Numerical Investigation of Impingement Heat Transfer on the Surface with Micro W-Shaped Ribs[J].International Journal of Heat&Mass Transfer,2016,107(10):683-694.
[22]Chaoyi Wan,Yu Rao,Peng Cheng.Numerical Predictions of Jet Impingement Heat Transfer on Square PinFin Roughened Plates[J].Applied Thermal Engineering,2015,80(1):301-309.
[23]Son C,Dailey G,Ireland P,et al.An Investigation of the Application of Roughness Elements to Enhance Heat Transfer in an Impingement Cooling System[R].ASMEGT 2005-68504.
[24]Son C,Ireland P,Gillespie D.The Effect of Roughness Element Fillet Radii on the Heat Transfer Enhancement in an Impingement Cooling System[R].ASME GT2005-68186.
[25]Koizumi T,Suzuki S,Matsumura M.An Experimental and Numerical Study of Heat Transfer from Arrays of Impinging Jets with Surface Ribs[J].Journal of Heat Transfer,2012,134(8).
[26]陶文铨.数值传热学[M].西安:西安交通大学出版社,1992.
[27]王玉艳,王鹏,白敏丽,等.射流冲击冷却过程的数值研究[J].东北大学学报(自然科学版),2016,37(5):692-696.
[28]Xing Y,Spring S,Weigand B.Experimental and Numerical Investigation of Heat Transfer Characteristics of Inline and Staggered Arrays of Impinging Jets[J].Journal of Heat Transfer,2010,132(9):53-58.
[2]Martin H.Heat and Mass Transfer Between Impinging Gas Jets and Solid Surfaces[J].Advances in Heat Transfer,1977,13(1):1-60.
[3]Han B,Goldstein R J.Jet-Impingement Heat Transfer in Gas Turbine Systems[J].Annals News York Acdemy of Science,2001,934(1):147-161.
[4]Hollworth B R,Cole G H.Heat Transfer to Arrays of Impinging Jets in a Crossflow[J].Journal of Turbomachinery,1987,109(4):564-571.
[5]Ligrani P M,Ren Z,Buzzard W C.Impingement Jet Array Heat Transfer with Small-Scale Cylinder Target Surface Roughness Arrays[J].International Journal of Heat&Mass Transfer,2016,107:895-905.
[6]El-Gabry L A,Kaminski D A.Experimental Investigation of Local Heat Transfer Distribution on Smooth and Roughened Surfaces Under an Array of Angled Impinging Jets[J].Journal of Turbomachinery,2005,127(3):532-544.
[7]Xing Y,Spring S,Weigand B.Experimental and Numerical Investigation of Impingement Heat Transfer on a Flat and Micro-Rib Roughened Plate with Different Crossflow Schemes[J].International Journal of Thermal Sciences,2011,50(7):1293-1307.
[8]Miller N,Siw S C,Chyu M K,et al.Effects of Jet Diameter and Surface Roughness on Internal Cooling with Single Array of Jets[R].ASME GT 2013-95400.
[9]谭蕾,张靖周,杨卫华.半封闭肋化通道射流冲击的实验[J].航空动力学报,2008,23(9):1678-1683.
[10]朱惠人,许都纯.不同直径及形状的短扰流柱群的流阻及换热[J],航空动力学报,2002,17(2):246-249.
[11]张丽,朱惠人,刘松龄,等.短扰流柱排端壁的平均换热实验[J].推进技术,2008,29(5):523-526.(ZHANG Li,ZHU Hui-ren,LIU Song-ling,et al.Experiments on Heat Transfer in Trapezoidal Channel with Short Pin-Fin Arrays[J].Journal of Propulsion Technology,2008,29(5):523-526.)
[12]苏红桢,刘松龄,许都纯.叉排型扰流柱排内部流场的实验研究[J].推进技术,1997,18(2):50-55.(SU Hong-zhen,LIU Song-ling,XU Du-chun.An Experimental Investigation on Flow Field in Staggered Pin Fin Array[J].Journal of Propulsion Technology,1997,18(2):50-55.)
[13]周明轩,薛树林,贺宜红,等.高阻塞比肋化通道对流换热特性实验研究[J].推进技术,2018,39(2):335-341.(ZHOU Ming-xuan,XUE Shu-lin,HE Yihong.Experimental Investigation on Convective Heat Transfer Characteristics of High Blockage Ribs Channel[J].Journal of Propulsion Technology,2018,39(2):335-341.)
[14]Chyu M K.Heat Transfer and Pressure Drop for Short Pin-Fin Arrays with Pin-Endwall Fillet[J].Journal of Heat Transfer,1990,112(4):926-932.
[15]Chyu M K,Hsing Y C,Natarajan V.Convective Heat Transfer of Cubic Fin Arrays in a Narrow Channel[J].Journal of Turbomachinery,1998,120(2):181-183.
[16]Chyu M,Yen C,Siw S.Comparison of Heat Transfer from Staggered Pin Fin Arrays with Circular,Cubic and Diamond Shaped Elements[R].ASME GT 2007-28306.
[17]Siw S C,Fradeneck A D,Chyu M K,et al.The Effects of Different Pin-Fin Arrays on Heat Transfer and Pressure Loss in a Narrow Channel[R].ASME GT 2015-43855.
[18]饶宇,万超一,陈鹏.具有针肋的狭窄空间冲击冷却实验和数值计算[J].航空动力学报,2016,31(8):1852-1859.
[19]万超一,饶宇,陈鹏.狭窄通道具有针肋的表面冲击冷却实验研究[J].工程热物理学报,2016,V37(9):2000-2005.
[20]闫建坤,郭涛,朱惠人,等.微尺度阵列射流冲击结构换热特性实验研究[J].推进技术,2016,37(9):1681-1687.(YAN Jian-kun,GUO Tao,ZHU Huiren,et al.Experimental Investigation of Heat Transfer Characteristics on Micro-Scale Array Jet Impingement[J].Journal of Propulsion Technology,2016,37(9):1681-1687.
[21]Yu Rao,Peng Cheng,Chaoyi Wan.Experimental and Numerical Investigation of Impingement Heat Transfer on the Surface with Micro W-Shaped Ribs[J].International Journal of Heat&Mass Transfer,2016,107(10):683-694.
[22]Chaoyi Wan,Yu Rao,Peng Cheng.Numerical Predictions of Jet Impingement Heat Transfer on Square PinFin Roughened Plates[J].Applied Thermal Engineering,2015,80(1):301-309.
[23]Son C,Dailey G,Ireland P,et al.An Investigation of the Application of Roughness Elements to Enhance Heat Transfer in an Impingement Cooling System[R].ASMEGT 2005-68504.
[24]Son C,Ireland P,Gillespie D.The Effect of Roughness Element Fillet Radii on the Heat Transfer Enhancement in an Impingement Cooling System[R].ASME GT2005-68186.
[25]Koizumi T,Suzuki S,Matsumura M.An Experimental and Numerical Study of Heat Transfer from Arrays of Impinging Jets with Surface Ribs[J].Journal of Heat Transfer,2012,134(8).
[26]陶文铨.数值传热学[M].西安:西安交通大学出版社,1992.
[27]王玉艳,王鹏,白敏丽,等.射流冲击冷却过程的数值研究[J].东北大学学报(自然科学版),2016,37(5):692-696.
[28]Xing Y,Spring S,Weigand B.Experimental and Numerical Investigation of Heat Transfer Characteristics of Inline and Staggered Arrays of Impinging Jets[J].Journal of Heat Transfer,2010,132(9):53-58.