燃气轮机内部通流冷却叶片的流动传热特性对于燃机的整体效率有着重要的影响,而叶片表面的转捩流场一直是阻碍对叶片冷却性能进行精确分析的主要因素.本文采用SST湍流模型及γ-Re_θ转捩模型对MARK Ⅱ叶型进行数值模拟,通过分析叶栅通道内传热特性以考察该转捩模型的适应性,肯定了该转捩模型对于湍流边界层发生位置判断的正确性,以及对转捩发生点上游叶片表面温度变化趋势的预测的正确性.同时本文指出γ-Re_θ转捩模型与湍流模型结合时可能存在对湍动能过渡抑制的问题,有待进一步研究.
The flow characters and heat transfer of the blade with an internal cooling system have a great impact on the whole efficiency of a gas turbine while the transition is the main obstacle in the numerical analysis.In this paper,the Garoma-Re theta transition model combined with the SST turbulence model is applied to analyze the heat transfer of a Mark Ⅱ blade.The prediction of the onset of turbulence layer is proven to be satisfied,and the trend of the blade surface temperature before the transition is also captured through the model.Meanwhile,it is pointed out that the turbulent kinetic energy might be suppressed in the laminar layer before the bypass transition due to the combination of the transition model and the turbulence model.
参考文献
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