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将所开发的HIT-3D气热耦合求解器应用于某低压涡轮的数值仿真中,对该涡轮设计简单的内冷结构,比较了不同湍流、转捩模型对叶片温度场预测的影响,初步验证了所开发的耦合求解器的应用能力.由于目前涡轮的冷却结构复杂,数值计算量比较大,为此发展了一种气热耦合与工程设计相结合的方法,以该涡轮为算例初步验证了该方法,并初步模拟了粗糙内壁面对叶片热负荷的影响.计算表明:在层流、转捩流动区域,采用全湍流模型预测的温度要比采用转捩模型的高,同时所发展的气热耦合与工程方法是可行的,可以极大地减少设计中的计算量.
The developed HIT-3D air-heat coupling solver is applied to the numerical simulation of a low-pressure turbine. A simple internal cooling structure is designed for the turbine, and the effects of different turbulence and transition models on the prediction of the blade temperature field are compared. The application ability of the coupled solver was developed.Because the current cooling structure of the turbine is complex and the numerical calculation is relatively large, a method combining air-heat coupling and engineering design has been developed for this purpose, The method is applied to simulate the influence of rough inner wall on the thermal load of the blade.The results show that the temperature predicted by the full turbulence model is higher than that of the transition model in the laminar and turbulent flow regions, Air-heat coupling and engineering methods are feasible and can greatly reduce the computational load in the design.