Convective heat transfer of a rotating multi-stage cavity with axial throughflow
Convective heat transfer of a rotating multi-stage cavity with axial throughflow
复制标题
轴向通流旋转多级腔体的对流传热
DOI：
10.1016/j.ijheatmasstransfer.2017.11.110
复制
发表时间：
2018
影响因子：
5.2
通讯作者：
Xiang Luo
中科院分区：
文献类型：
--
作者：
Yongkai Quan;Di Han;Guoqiang Xu;J. Wen;Xiang Luo
对轴向通流的多级旋转腔体的换热特性进行了实验研究。空腔是燃气涡轮机中高压压气机的模型，其间隙比为0. 24，半径比为0. 23。文中分析讨论了惯性力、离心浮力、科氏力对换热系数和表面温度分布的影响。热传递系数是用创新的HTC传感器测量的，而表面温度是用嵌入式热电偶测量的，当护罩被感应加热器加热时。测量的无量纲参数范围很广：最大轴向雷诺数、旋转雷诺数和浮力参数分别可达9.87 × 104、1.81 × 106和0.3。根据实验结果，在感兴趣的盘的两侧可以识别出具有显著不同的传热特性的两个区域，即在小半径区域由冲击冷却引起的强制对流区和在中等和高半径区域的类Rayleigh-Bénard对流区。在圆盘迎风面和背风面，换热系数沿径向沿着分布有两个峰值。
The heat transfer characteristics in an engine-like rotating multi-stage cavity with axial throughflow are experimentally investigated. The cavity is a model of high pressure compressor in gas turbine, which has a gap ratio of 0.24 and a radius ratio of 0.23. Herein, the effects of inertial force, centrifugal buoyancy force, Coriolis force on the heat transfer coefficient (HTC) and the surface temperature distribution are analyzed and discussed. The heat transfer coefficient is measured with an innovative HTC sensor whereas the surface temperature is measured by embedded thermocouples when the shroud is heated by an induction heater. The measurements are conducted in a wide range of non-dimensional parameters: the maximum axial Reynolds numbers, rotational Reynolds numbers and buoyancy parameter can reach 9.87 × 104, 1.81 × 106and 0.3, respectively. According to the experimental results, two regions with significantly different heat transfer characteristics could be identified on both side of the interested disc, namely, the forced convection zone caused by impingement cooling in the low radius area, and the Rayleigh-Bénard-like convection zone in the medium and high radius areas. On both windward and leeward sides of the disc, the heat transfer coefficients are zigzagging along the radial direction with two observed peak values.