横流对振荡射流冲击冷却特性影响的数值研究  

Numerical Study on the Effects of Cross Flow on the Cooling Characteristics of Oscillating Impingement Jets

作　　者：汪胜 韩东[1] 周天昊 李世瑞 何纬峰[1] 王瑾程 WANG Sheng;HAN Dong;ZHOU Tianhao;LI Shirui;HE Weifeng;WANG Jincheng(College of Energy and Power Engineering,Nanjing University of Aeronautics and Astronautics,Nanjing 210016,China)

机构地区：[1]南京航空航天大学能源与动力学院,南京210016

出　　处：《动力工程学报》2022年第2期115-121,共7页Journal of Chinese Society of Power Engineering

基　　金：南京航空航天大学研究生创新基地(实验室)开放基金立项资助项目(kfjj20200205,kfjj20200214)。

摘　　要：为了分析横流条件下振荡射流冲击靶面的换热特性,采用数值计算方法研究了横向排列和纵向排列方式下振荡射流冲击靶面的冷却性能,并对纵向排列下的射流振荡器进行了排布角度修正。结果表明:横流对冲击换热的作用主要受到两方面影响,即冲击点附近的马蹄涡和冲击点向后偏移程度;对于靶面上的冲击核心区,总体上纵向排列的高换热区域后移程度小于横向排列,而前者对流换热效果受马蹄涡的影响更大;在纵向排列、入口雷诺数为21800、横流雷诺数为14400的工况下,20°的排布角度下冲击核心区的平均努塞尔数增大21%。To analyze the heat transfer characteristics of the oscillating jet impinging on the target surface under the cross flow condition,numerical calculation was used to study cooling performances of the oscillating jets impinging on the target surface with horizontal arrangement and longitudinal arrangement.And the correction of the arrangement angle was carried out for longitudinal arrangement oscillating jets.Results show that the effects of the cross flow on the impingement heat transfer is mainly affected by two aspects:the horseshoe nest near the impingement point and backward offset degree of the impingement point.For the impingement core area on the target surface,the backward offset degree of the high heat transfer area arranged longitudinally is generally smaller than that arranged horizontally,while the influence of the horseshoe nest on the convective heat transfer of the former is larger.In the condition of longitudinal arrangement,the inlet Reynolds number is 21800 and the cross flow Reynolds number is 14400,an offset angle of 20°can increase the average Nusselt number of the impingement core area by 21%.

关 键 词：振荡射流 横流 冲击换热 努塞尔数 数值模拟 

分 类 号：TK229.2[动力工程及工程热物理—动力机械及工程]