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雷诺数的改变会引起涡轮叶片边界层等流态的改变,进而对叶片表面的对流换热产生强烈影响。该文首先结合实验数据对影响流热耦合计算精度的若干因素的敏感性进行了分析;然后在此基础上,针对MarkⅡ叶型分析了雷诺数对涡轮叶片表面换热的影响。结果表明:流热耦合计算时相关参数的选择对模拟的精度有明显影响,该文针对MarkⅡ叶型得到的一套参数是合理的,相关结果与实验吻合良好;雷诺数的变化使得边界层等流动状态发生改变,从而导致涡轮叶片表面对流换热状态和温度分布产生明显的差异。
Reynolds number changes will cause the turbine blade boundary layer and other fluid changes, thus the convection heat transfer on the blade surface have a strong impact. In this paper, the sensitivity of several factors influencing the calculation accuracy of flow-heat coupling is first analyzed based on the experimental data. Then based on this, the influence of Reynolds number on the heat transfer of the turbine blade surface is analyzed for the Mark II leaf type. The results show that the choice of relevant parameters in the calculation of flow-heat coupling has a significant impact on the accuracy of the simulation. A set of parameters obtained from the Mark II leaf model is reasonable and the results are in good agreement with the experimental results. The changes of the Reynolds number make the boundary layer Flow state changes, resulting in a significant difference in the convective heat transfer and temperature distribution on the turbine blade surface.