扰流柱形状对冲击冷却综合换热效率影响研究

推进技术 ›› 2019, Vol. 40 ›› Issue (3): 624-634.

扰流柱形状对冲击冷却综合换热效率影响研究

贺业光^1,2,郭曾嘉¹,李润东¹,李少白¹,杨天华¹

沈阳航空航天大学能源与环境学院，辽宁沈阳 110136; 东北大学冶金学院，辽宁沈阳 110819,沈阳航空航天大学能源与环境学院，辽宁沈阳 110136,沈阳航空航天大学能源与环境学院，辽宁沈阳 110136,沈阳航空航天大学能源与环境学院，辽宁沈阳 110136,沈阳航空航天大学能源与环境学院，辽宁沈阳 110136

发布日期:2021-08-15
作者简介:贺业光，硕士，研究领域为燃气轮机冷却技术。 E-mail: heyeguang@sau.edu.cn 通讯作者:李润东，博士，教授、博导，研究领域为环境增值能源。
基金资助:
国家“万人计划”科技创新领军人才(组厅字〔2016〕37号-286 )；辽宁省攀登学者奖励计划。

Numerical Simulation of Efficiency Index of Impingement Cooling System with Different Pin Fins Shapes

College of Energy and Environment，Shenyang Aerospace University，Shenyang 110136，China;School of Metallurgy，Northeastern University，Shenyang 110819，China,College of Energy and Environment，Shenyang Aerospace University，Shenyang 110136，China,College of Energy and Environment，Shenyang Aerospace University，Shenyang 110136，China,College of Energy and Environment，Shenyang Aerospace University，Shenyang 110136，China and College of Energy and Environment，Shenyang Aerospace University，Shenyang 110136，China

Published:2021-08-15

摘要/Abstract

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1×104～3×104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。

关键词: 冲击冷却；扰流柱；数值模拟；换热特性；流动特性；综合换热效率

Abstract: 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 1×104 to 3×104， 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.

Key words: Impingement cooling；Pin fins；Numerical simulation；Heat transfer characteristic；Flow characteristic；Efficiency index

贺业光,郭曾嘉,李润东,李少白,杨天华. 扰流柱形状对冲击冷却综合换热效率影响研究[J]. 推进技术, 2019, 40(3): 624-634.

HE Ye-guang^1,2,GUO Zeng-jia¹,LI Run-dong¹,LI Shao-bai¹,YANG Tian-hua¹. Numerical Simulation of Efficiency Index of Impingement Cooling System with Different Pin Fins Shapes[J]. Journal of Propulsion Technology, 2019, 40(3): 624-634.

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