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以MarkII气冷涡轮叶片为研究对象,考察了换热系数分布对叶片外表面温度分布的影响。首先分别以温度和换热系数实验值作为热边界条件验证了固体导热计算方法和CFD程序的有效性,然后分析了6种典型热边界条件下的叶片外表面温度分布,并与实验值进行对比。由分析结果可知:叶片外表面温度与换热系数紧密关联,经验关联式(层流、湍流)条件下预测得到的温度偏差较大,当换热系数由能考虑边界层转捩影响的CFD计算得到时,预测得到的温度与实验值较为接近。
Taking MarkII air-cooled turbine blade as the research object, the influence of the heat transfer coefficient distribution on the temperature distribution of the outer surface of the blade was investigated. First of all, the thermal conductivity calculation method and the CFD program are validated by using the experimental values of the temperature and the heat transfer coefficient respectively as the thermal boundary conditions. Then the temperature distribution of the outer surface of the blade under six typical thermal boundary conditions is analyzed and compared with the experimental values . From the analysis results, it is known that the temperature of the outer surface of the blade is closely related to the heat transfer coefficient, and the temperature deviation predicted by the empirical correlation (laminar and turbulent flow) is large. When the heat transfer coefficient is calculated by the CFD which can consider the influence of boundary layer transition When obtained, the predicted temperature is close to the experimental value.