Heat Transfer in Rotating Narrow Rectangular Ducts With Heated Sides Parallel to the r-z Plane
Heat Transfer in Rotating Narrow Rectangular Ducts With Heated Sides Parallel to the r-z Plane
复制标题
加热侧平行于 r-z 平面的旋转窄矩形管道中的传热
DOI：
10.1115/1.1418370
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发表时间：
2002
影响因子：
--
通讯作者：
A. Bergles
中科院分区：
文献类型：
--
作者：
F. Willett;A. Bergles
在燃气涡轮机叶片设计中，在冷却回路中使用多种通道形状和取向。迄今为止，大多数旋转通道传热研究都考虑了方形或圆形横截面的通道。本研究的特点是充分发展的湍流对流换热的窄横截面（高宽比为1：10）的管道旋转的效果。使用窄横截面导管进行实验，导管横截面的长边垂直于叶片切向速度方向（平行于r-z平面）。在实验中，使用环境压力和温度条件下的高分子量气体（制冷剂-134A）来模拟与发动机条件相匹配的冷却剂与壁的密度比。薄箔加热器用于在管道的长边产生均匀的热通量;窄边不加热。管道雷诺数变化最大为31，000;旋转数变化最大为0.11。试验结果表明，旋转和高宽比对通道前后壁面换热的影响。结果提供了深入了解旋转（科里奥利）的影响，在没有浮力的影响
In gas turbine blade design, a variety of channel shapes and orientations are used in the cooling circuit. Most of the rotating channel heat transfer research to date has considered channels of square or round cross-sections. This research characterizes the effect of rotation on fully developed turbulent convective heat transfer in ducts of narrow cross-section (height-to-width aspect ratio of 1:10). Experiments were conducted using ducts of narrow cross-section, oriented such that the long sides of the duct cross-section are perpendicular to the direction of blade tangential velocity (parallel to the r-z plane). In the experiment, a high-molecular-weight gas (Refrigerant-134A) at ambient pressure and temperature conditions was used to simulate coolant-to-wall density ratios that match engine conditions. Thin foil heaters were used to produce a uniform heat flux at the long sides of the duct; the narrow sides were unheated. Duct Reynolds numbers were varied up to 31,000; rotation numbers were varied up to 0.11. The test results show the effect of rotation and aspect ratio on duct leading and trailing side heat transfer. The results provide insight into the effect of rotation (Coriolis) in the absence of buoyancy effects