Numerical Study on Flow and Heat Transfer Characteristics of Swirl Cooling on Leading Edge Model of Gas Turbine Blade
Numerical Study on Flow and Heat Transfer Characteristics of Swirl Cooling on Leading Edge Model of Gas Turbine Blade
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DOI：
10.1115/gt2011-46125
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发表时间：
2011
期刊：
影响因子：
--
通讯作者：
Zhaofang Liu;Z. Feng;Liming Song
中科院分区：
文献类型：
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作者：
Zhaofang Liu;Z. Feng;Liming Song
本文对内前缘冷却通道模型中的旋流冷却进行了数值模拟。比较了四种湍流模型：标准κ-e模型、RNGκ-e模型、标准κ-ω模型和Sstκ-ω模型在模拟圆管内切向进口射流旋转流动中的相对性能。结果表明，从模拟精度来看，海温κ-ω模型是最好的模型。然后采用海温κ-ω模型进行模拟。分别采用单管和双管两种方式对旋流冷却效果进行了研究。研究了雷诺数和进口壁温比对流动特性的影响。结果表明，旋流室的换热系数随雷诺数的增大而增大，随进口壁温比的减小而增大。具有两个切向进气口的旋流管的换热强化约为非旋流管的三倍，而具有一个切向入口的旋流管的换热系数比非旋流管的换热系数高38%。版权所有*2011由ASME
In this paper a numerical simulation is performed to predict the swirl cooling on internal leading edge cooling passage model. The relative performances of four kinds of turbulence models including the standard κ-e model, the RNG κ-e model, the standard κ-ω model and the SST κ-ω model in the simulation of the swirl flow by tangential inlet jets in a circular pipe are compared with available experimental data. The results show that SST κ-ω model is the best one based on simulation accuracy. Then the SST κ-ω model is adopted for the present simulation. A circular pipe with a single rectangular tangential inlet jet or with two rectangular tangential inlet jets is adopted to investigate the swirl cooling and its effectiveness. The influence of the Reynolds number and the inlet to wall temperature ratio are investigated. The results indicate that the heat transfer coefficient on the swirl chamber increases with the increase of Reynolds number, and increases with the decrease of the inlet to wall temperature ratio. The swirl pipe with two tangential inlets could get a heat transfer enhancement of about three times to that of the nonswirling pipe, while swirl pipe with one tangential inlet could get a heat transfer coefficient 38% higher than that of the nonswirling pipe.Copyright © 2011 by ASME