基于热流固耦合分析的重型燃气轮机透平高压叶片寿命研究

Study on Life Prediction for HP Turbine Blade of Heavy-Duty Gas Turbine Based on Analysis of Multi-Factor Coupling Physical Fields

先进高效的重型燃气轮机透平高压叶片工作在高温、高压、高转速的严苛环境中,为了评估其安全可靠性,本文基于三维稳态粘性Navier-Stokes方程,考虑气动与热物理场的耦合,运用共轭计算技术和SST湍流模型建立了具有完整内外冷却结构的某燃气轮机高压透平叶片热流固耦合分析模型和寿命分析模型,获得了叶片温度分布及相应的应变应力场,并详细分析了叶片上热障涂层和金属基底的寿命状况。研究结果对理解和掌握先进的燃气轮机透平叶片设计技术具有重要参考意义。

The high pressure turbine blade is operated under high temperature,high pressure and high rotating speed in heavy-duty gas turbine.In this study,life model for evaluating the safety of a high pressure turbine blade of a gas turbine has been developed by applying conjugate calculation technique and SST turbulence model with the coupling computation of aerodynamics and thermophysics fields based on three-dimensional steady viscous Navier-Stokes equations.The temperature distribution and corresponding strain and stress field of the blade were obtained,and the life prediction for thermal barrier coatings and metal base of blade was pursued too.The numerical results can provide usable data for understanding and mastering advanced design technique of turbine blade for heavy-duty gas turbine.