不同形状扰流柱对溢流层板腔内流动与换热特性的影响
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摘要
为了获得不同形状扰流柱对溢流层板流动与换热特性的影响,对溢流层板进行了三维流固耦合的数值模拟,重点研究了菱形、水滴形、椭圆形、圆形与正方形5种形状的扰流柱在不同射流雷诺数(Re_j=2 000—10 000)下对层板腔内流动和换热的影响。研究结果表明:当扰流柱为水滴形时对应的溢流孔板面平均换热系数最高,扰流柱为菱形时对应的冲击板面平均换热系数最高,而对于扰流柱面,正方形扰流柱面平均换热系数最高;几种扰流柱形状对应的层板结构中,菱形扰流柱对应的层板结构综合换热能力最强,随射流雷诺数的增大几乎呈线性变化。
In order to study the effect of different pin-fins on internal flow and heat transfer characteristics of the overflow laminate, numerical simulations were carried out with the threedimensional fluid-solid coupling method. Five different shapes were emphatically investigated under various jet Reynolds numbers( Re_j= 2 000-10 000),including diamond-shaped,water dropshaped,elliptical, circle and square-shaped. The results show that the average heat transfercoefficient of the overflow plate is maximum with the water drop-shaped pin fins. The diamond-shaped pin fins result in the optimum average heat transfer coefficient of the impinging plate. For the pin fin surfaces,the average heat transfer coefficient shows the highest level with the square-shaped pin fins.Among the above-mentioned laminate configurations with distinct pin fin shapes,the diamond-shaped pin fin shows the best overall heat transfer capacity which almost shows the linear variation tendency with the increase of jet Reynolds number.
In order to study the effect of different pin-fins on internal flow and heat transfer characteristics of the overflow laminate, numerical simulations were carried out with the threedimensional fluid-solid coupling method. Five different shapes were emphatically investigated under various jet Reynolds numbers( Re_j= 2 000-10 000),including diamond-shaped,water dropshaped,elliptical, circle and square-shaped. The results show that the average heat transfercoefficient of the overflow plate is maximum with the water drop-shaped pin fins. The diamond-shaped pin fins result in the optimum average heat transfer coefficient of the impinging plate. For the pin fin surfaces,the average heat transfer coefficient shows the highest level with the square-shaped pin fins.Among the above-mentioned laminate configurations with distinct pin fin shapes,the diamond-shaped pin fin shows the best overall heat transfer capacity which almost shows the linear variation tendency with the increase of jet Reynolds number.
引文
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[15] FUNAZAKI K,HACHIYA K. Systematic numerical studies on heat transfer and aerodynamic characteristics of impingement cooling devices combined with pins[C]//ASME Turbo Expo 2003,collocated with the 2003 International Joint Power Generation Conference. American Society of Mechanical Engineers,2003:185-192.
[16] FAVARETTO C F F,FUNAZAKI K. Application of genetic algorithms to design of an internal turbine cooling system[C]//ASME Turbo Expo 2003,collocated with the2003 International Joint Power Generation Conference.American Society of Mechanical Engineers,2003:273-278.
[2] JENG T M,TZENG S C. Pressure drop and heat transfer of square pin-fin arrays in in-line and staggered arrangements[J]. International Journal of Heat and Mass Transfer,2007,50(11/12):2364-2375.
[3] SWEENEY P C,RHODES J F. An infrared technique for evaluating turbine airfoil cooling designs[C]//ASME1999 International Gas Turbine and Aeroengine Congress and Exhibition. American Society of Mechanical Engineers,1999:V003T01A033-V003T01A033.
[4] YAMAWAKI S,NAKAMATA C,IMAI R,et al. Cooling performance of an integrated impingement and pin fin cooling configuration[C]//ASME Turbo Expo 2003,collocated with the 2003 International Joint Power Generation Conference. American Society of Mechanical Engineers,2003:133-142.
[5]赵乃芬.致密多孔层板冷却结构研究[D].南京:南京航空航天大学,2014.
[6]孙启超.层板结构内部流动与换热特性研究[D].南京:南京航空航天大学,2012.
[7]谭晓茗,李业芳,张靖周.致密多孔层板冷却结构研究[J].机械工程学报,2012,48(12):144-149.
[8]谭晓茗,胡训尧,张靖周.涡轮叶片尾缘梯形通道异形扰流柱流动换热特性实验[J].航空动力学报,2012,27(2):319-325.
[9]胡娅萍,卢元丽,吉洪湖,等.层板冷却涡轮叶片前缘内部流动与传热特性实验[J].航空动力学报,2014,29(2):241-249.
[10]卢元丽,王鸣,吉洪湖,等.扰流柱对层板冷却叶片前缘传热影响的数值研究[J].航空发动机,2013,39(2):57-61.
[11]王鸣,卢元丽,吉洪湖.冲击孔对层板冷却叶片前缘传热影响的数值研究[J].航空动力学报,2013(10):2240-2247.
[12]何跃龙,徐华胜,刘堃,等.扰流柱形状对层板流阻特性的影响研究[J].燃气涡轮试验与研究,2010(4):39-43.
[13] HAN L,CHANG H,DING Y,et al. Study on Effect of Filling Ratio on Heat Transfer Characteristics in Laminated Structure[J]. Aeroengine,2012,1:013.
[14] FUNAZAKI K,TARUKAWA Y,KUDO T,et al. Heat Transfer Characteristics of an Integrated Cooling Configuration for Ultra-High Temperature Turbine Blades:Experimental and Numerical Investigations[C]//ASME Turbo Expo 2001:Power for Land,Sea,and Air. American Society of Mechanical Engineers, 2001:V003T01A031-V003T01A031.
[15] FUNAZAKI K,HACHIYA K. Systematic numerical studies on heat transfer and aerodynamic characteristics of impingement cooling devices combined with pins[C]//ASME Turbo Expo 2003,collocated with the 2003 International Joint Power Generation Conference. American Society of Mechanical Engineers,2003:185-192.
[16] FAVARETTO C F F,FUNAZAKI K. Application of genetic algorithms to design of an internal turbine cooling system[C]//ASME Turbo Expo 2003,collocated with the2003 International Joint Power Generation Conference.American Society of Mechanical Engineers,2003:273-278.