涡轮动叶冷却结构设计方法Ⅲ:气热耦合计算

Cooling Structure Design for Turbine BladesⅢ:Conjugate Heat Transfer Analysis

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 conjugated heat transfer analysis is applied during detailed design of blade cooling structure. The calculate domain 3-D models are built with the help of parameterized design method so that models contain detailed geometrical feature and of high accuracy. Structured meshes are generated in fluid domains, with special treats on fluid-solid walls with heat transfer according to the requirements of turbulence model. The results of pipe-net calculation and conjugate heat transfer analysis are compared, discovering that the flow-net calculation is of lower accuracy and the results of conjugate heat transfer analysis are relatively reliable. One conjugated heat transfer analysis of a certain cooling structure of a blade requires 5 to 15 days, which generally meets the needs of engineering design.