尾缘劈缝是高温涡轮叶片冷却结构的重要组成部分，准确修正缩放模型试验与实际尺寸部件工况的差异，是评估冷却效果的关键技术。基于共轭传热模型和C3X冷却模型，在叶栅马赫数M1=0.9的条件下，数值模拟研究了缩尺效应在尾缘劈缝模化试验中对冷却效率的影响。基于一维传热分析，建立一种针对几何缩尺效应的综合冷却效率修正方法,在不同缩放比和毕渥数下均表现出良好修正能力，对实际尺寸叶片冷却性能的预测相对误差为1.33% – 6.3%。在缩放模型与基准模型间相似准则失配时，本方法可有效预估并修正冷却效率差异，使缩放模型结果逼近真实性能,提升模型试验的实用价值。

Cutback trailing edge is a critical component of cooling structures in high-temperature turbine blades. It is the key method to correct accurately the model testing results for predicting a real working unit. C3X cooling blade was investigated by a conjugate heat transfer model at the flow Mach number of 0.9. The geometric scale effects on the cooling efficiency of the cutback were obtained. Based on one-dimensional heat transfer analysis, this paper proposes a corrected method for overall cooling efficiency that accounts for geometric scaling. The method demonstrates strong predictive capability under various scaling ratios and Bi conditions, with relative errors ranging from 1.33% to 6.3% in predicting full-scale blade cooling performance. When scaling leads to mismatched similarity parameters between scaled and baseline models, this method can effectively correct the scaled model results to approximate the baseline performance, thereby providing reliable data support for subsequent experimental studies.

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