摘要
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MARKⅡ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 efficicncy of a gas tm＇bine while the transition is the main obstacle in the numerical analysis. In this paper, the Gamma-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.
出处
《工程热物理学报》
EI
CAS
CSCD
北大核心
2009年第11期1849-1852,共4页
Journal of Engineering Thermophysics
基金
973项目“燃气轮机若干关键科学技术问题的研究”资助(No.2007CB210100)
关键词
转捩
燃气轮机
耦合传热
内部通流冷却
数值模拟
transition
gas turbine
conjugate heat transfer
internal cooling
numerical simulation
