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三维气热耦合数值模拟是涡轮叶片冷却结构详细设计中应用的热分析方法。三维气热耦合数值模拟的计算域实体模型建立借助于参数化方法,模型包括冷却结构尽可能多的细节、并保证足够高的模型精度。网格生成时,流体域采用结构化网格,并且需要在换热壁面上根据湍流模型的要求进行加密。将管网计算结果与三维数值模拟结果进行对比,发现管网计算的精度有限,而气热耦合计算方法能够捕捉更多流动换热现象,计算结果相对可信。对单个冷却结构方案进行三维数值计算的周期为5～15天,基本满足工程设计要求。
Three-dimensional numerical simulation of air-heat coupling is a thermal analysis method used in the detailed design of turbine blade cooling structure. Computation domain solid model for 3D numerical simulation of gas-heat coupling With the aid of parametric method, the model includes as many details as possible for the cooling structure and ensures a sufficiently high model accuracy. When the mesh is generated, the fluid domain uses a structured grid and needs to be encrypted on the heat exchange wall according to the turbulence model requirements. Comparing the result of pipe network with the result of three-dimensional numerical simulation, it is found that the accuracy of pipe network calculation is limited, while the calculation method of heat and air coupling can capture more heat and fluid flow, and the calculation result is relatively credible. The cycle of three-dimensional numerical calculation of a single cooling structure scheme is 5 to 15 days, basically meeting the engineering design requirements.