气冷涡轮叶栅流动及热应力特性的数值研究

Numerical Investigation of Air-cooled Gas Turbine Flow and Thermal Stress Characteristics

采用CFX商用软件的不同湍流模型对NASA-MarkII高压燃气气冷涡轮叶栅进行气热耦合计算,着重分析了叶栅内部流动情况及传热特性。与实验结果比较,k-ω-SST-GammaTheta湍流模型计算结果与实验结果吻合较好。应用ANSYS11.0商用软件对气冷涡轮叶片气热耦合温度场结果进行热应力计算。结果表明,涡轮叶片温度场求解结果对叶片内部热应力分布具有显著影响。

The commercial code CFX is used to simulate NASA-MarkII high pressure gas air-cooled turbine. Three turbulence models are adopted to solve conjugate heat transfer problem of this three-dimensional turbine blade. The flow and heat transfer characteristic of turbine are researched. Comparing to the experimental results, k-ω- SST-GammaTheta turbulence model results are more accurate. ANSYS11.0 is applied to analysis the thermal stress of solid blade and the results of Von Mises stress show that the temperature results have a great effect on the results of blade thermal stress.