Evaluation of Heat Transfer Enhancement on Rotational Gas Turbine Blade Internal Cooling Channel With Dimpled Surface
Evaluation of Heat Transfer Enhancement on Rotational Gas Turbine Blade Internal Cooling Channel With Dimpled Surface
复制标题
凹坑表面旋转燃气轮机叶片内冷通道强化传热评价
DOI：
10.1115/1.4054288
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发表时间：
2022
期刊：
影响因子：
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通讯作者：
Farah Nazifa Nourin, Brinn Leighton
中科院分区：
文献类型：
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作者：
Farah Nazifa Nourin, Brinn Leighton
本文研究了在均匀热流密度为2000W/m2的情况下，旋转对燃气轮机叶片内冷却的影响。实验以300转/分、600转/分和900转/分三种不同的转速进行，雷诺数(Re)在6000到50,000之间，采用双通道冷却。采用大涡模拟(LES)技术进行了数值模拟，以了解冷却通道的旋转流动行为。考虑了四种不同排列的凹陷冷却流道表面，具有两种不同的凹陷形状，即部分球形和片状。研究发现，旋转效应、凹坑布置和设计对换热有显著影响。结果表明，局部球形单排凹陷表面的换热系数和压降最大。相比之下，叶形凹陷冷却通道的热效率最高。
The present investigation represents the rotational effect on gas turbine blade internal cooling with a uniform heat flux of 2000 W/m2at the bottom wall. The experiment was conducted with three different rpms, such as 300 rpm, 600 rpm, and 900 rpm, with Reynolds number (Re) ranging from 6000 to 50,000 with a two-pass cooling channel. The numerical investigation was conducted with the large eddy simulation (LES) technique to understand the rotational flow behavior of the cooling channel. Four distinct arrangements of dimpled cooling channel surfaces were considered with two different dimple shapes, i.e., partial spherical and leaf. It is found that the rotation effect, dimple arrangement, and design have significant influences on heat transfer. Results indicated that the partial spherical 1-row dimpled surface experienced the highest heat transfer coefficient and pressure drop. In contrast, the leaf-shaped dimpled cooling channel experienced the highest thermal efficiency.