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本文研究了不同湍流模型对燃气透平静叶、动叶叶顶和机匣传热的预测特性,分析了SSTγ-θ模型在不同湍流强度、湍流尺度和雷诺数下对C3X静叶传热系数的计算精度。结果表明:SSTγ-θ模型对静叶传热系数的预测精度明显优于其它两方程湍流模型;SSTγ-θ模型的计算结果在本文所研究的湍流强度和雷诺数范围内与试验结果能够很好吻合;不同湍流模型计算的叶顶和机匣传热系数分布规律与试验结果相似,SSTγ-θ模型的预测结果在叶顶及机匣的大部分区域与试验结果最为吻合。
In this paper, different turbulence models are used to predict the heat transfer characteristics of gas turbine vanes, rotor blades and casing, and the influence of different turbulence intensity, turbulence scale and Reynolds number on the heat transfer coefficient calculation accuracy. The results show that the prediction accuracy of SSTγ-θ model for vane heat transfer coefficient is obviously better than that of the other two equations. The calculation results of SSTγ-θ model are in good agreement with the experimental results in the range of turbulence intensity and Reynolds number The results of SSTγ-θ model are in good agreement with the experimental results in most areas of the blade tip and casing.