【摘要】 为解决在涡轮叶片冷却实验中因采用几何缩比模型而导致的冷却效率偏差问题，针对尾缘劈缝这一关键冷却结构在缩放过程中冷却效率差异进行研究和修正。本文基于C3X叶片构建了尾缘劈缝冷却结构，采用共轭传热方法，在RUN 112工况下研究了几何缩尺比例X对劈缝区域综合冷却效率的影响。基于一维传热解析，明确了对流换热系数h与毕渥数Bi为影响缩尺效应的关键参数，进而提出了以对流换热系数修正因子为核心的效率修正方法。结果表明：该方法在缩放比0.5和1.5及不同毕渥数条件下，均能有效将冷却效率修正至基准工况，预测相对误差为1.33%～6.3%。在相似准则失配的情况下，该方法能够准确修正效率偏差，使缩放模型结果更逼近真实叶片性能，提升了模型试验的实用价值。更多还原

【Abstract】 Addressing the issues that geometrical scaled models were used to cause the cooling effective-ness deviation in turbine blade cooling experiment, the study and correction were conducted on the cooling effectiveness deviation for trailing edge cutback structure during the scaling process. A trailing edge cutback structure was constructed based on the C3X blade in this study. Utilizing a conjugate heat transfer methodology, the influence of the geometric scaling ratio X on the overall cooling effectiveness of the cutback region was investigated under RUN 112 operating conditions. Through one-dimensional heat transfer analysis, the convective heat transfer coefficient h and the Biot number Bi were identified as the key parameters governing the scaling effect. Consequently, a efficiency correction method centered on a convective heat transfer coefficient correction factor was proposed. Rsearch result shows that this method effectively corrected the cooling effectiveness to the baseline condition across scaling ratios of 0.5 and 1.5 and different Biot numbers, with a prediction relative error ranging from 1.33% to 6.3%. When similarity criteria were mismatched, the method can accurately correct the efficiency deviation, enabling results from scaled models to closely approximate real blade performance, thereby enhancing the practical value of model testing.更多还原