微小扰流元件对阵列冲击冷却流动换热的影响  

Influences of Micro Pin-Fin on Jet Array Impingement Heat Transfer

作　　者：陆训丰 李威宏[1] 李雪英[1] 任静[1] 蒋洪德[1] LU Xun-Feng;LI Wei-Hong;LI Xue-Ying;REN-Jing;JIANG Hong-De(Department of Energy and Power Engineering, Tsinghua University, Beijing 100080, China)

机构地区：[1]清华大学能源与动力工程系,北京100084

出　　处：《工程热物理学报》2018年第7期1447-1452,共6页Journal of Engineering Thermophysics

基　　金：国家自然科学基金资助项目(No.51706116;No.51676106)

摘　　要：通过实验方法,开展了Re数,冲击高度Z/D,微小扰流元件高度对阵列冲击冷却流动换热特性影响的研究。微小扰流元件的形状为长方体,尺寸为0.4 mm×0.4 mm(长×宽)。冲击孔直径D=4mm,孔间距X/D=Y/D=4,冲击距离Z/D的范围为0.75和3,微小扰流元件高度的范围为0.05D、0.2D、0.4D.对于冲击距离Z/D=0.75,Re数(基于冲击孔直径)的范围为2500～10000;对于冲击距离Z/D=3,Re数范围为5000～20000.结果显示,在微小扰流元件存在的情况下,换热系数显著增强,在本文实验工况下,换热增强达到30%～120%,同时,出流系数基本不变.With experimental methodology, the investigation utilizes different Reynolds number,jet to target distance（Z/D）, pin-fin height for impingement cooling augmentation to illustrate the effects on jet array impingement heat transfer. The impingement hole diameter（D） is 4 millimeter,with streamwise and spanwise jet-to-jet spacing 4 D. Considered are effects of jet to target plate distance（Z/D： 0.75, 3） and pin-fin height（h/D： 0.05, 0.2, 0.4）. Tests are performed at impingement jet Reynolds numbers from 2000 to 10000 for configuration of Z/D=0.75, from 5000 to 20000 for configuration of Z/D=3. The experimental results illustrate that there are significant heat transfer augmentation（30%～120% more than baseline flow condition） with micro pin-fin on impingement target surface, and discharge coefficient is almost the same.

关 键 词：燃气轮机 阵列冲击冷却 微小扰流元件 

分 类 号：TK474.7[动力工程及工程热物理—动力机械及工程]