涡轮叶片气热耦合数值模拟方法

研究了气热耦合计算模型,建立了采用有限差分方法进行涡轮气热耦合计算的数值仿真平台,并利用该平台采用考虑转捩和不考虑转捩两类湍流模型对具有径向冷却通道的MARK II型叶片进行数值模拟,同时将结果与实验值进行比较,对比表明:考虑转捩的湍流模型能够准确的反映出边界层内的流态和热传导情况,因此壁面处温度和换热系数更接近于实验值,与实验值吻合较好。

Conjugate heat transfer technique applied to a turbine blade

The numerical model for conjugate heat transfer(CHT) simulation was studied,and a finite difference platform of CHT calculations for air-cooled turbines was constructed.The platform,with flow model considering laminar-turbulent transition and full turbulence models,was applied to simulate the MARKII turbine guide vane,which was cooled internally by flowing through 10 radial round pipes.The numerical results were compared with experimental data.It indicated that the simulation considering transition was able to predict flow and thermal conditions inside the boundary layer correctly,thus it led to good match between the predicted distributions of vane temperature and heat transfer coefficient and the measured data.