The influence of the braided structure on the film cooling performance over a ceramic matrix composite plate was numerically and experimentally investigated. The model based on the effective thermal conductivity and the model based on the internal micro braided structures were both built to demonstrate the effects of the braided structure on the cooling performance. Firstly, the experiment of the film cooling efficiency on the braided plate was carried out, to validate the numerical method, which presented good accuracy. Then, the temperature and cooling efficiency distributions were compared between the results based on these two models. Additionally, the braided angle of the internal structure and the relative position between the holes and the braided yarns were changed to investigate their influence on the cooling efficiency and the internal temperature filed. The results show that, the internal braided structure has obvious influence on the cooling effect and the heat conduction inside the composite plate, leading to the non-uniform variation of the cooling efficiency and the temperature. The relative variation between the average cooling efficiencies based on these two models reaches 10.4%. Additionally, the relative position between the film hole and the braided yarns would affect the phase of the cooling efficiency's non-uniform variation. The relative variation among the maximum cooling efficiencies with different relative positions could reach 10.73%, and the cooling performance is best when the hole is located on the horizontal braid yarns. The braided angle would affect the periodic length of the temperature's non-uniform variation inside the plate. The cooling performance is better with smaller braided angle, but the influence is not significant.

通过数值和实验研究了编织结构对陶瓷基复合板薄膜冷却性能的影响。建立了基于有效导热系数的模型和基于内部微编织结构的模型，以证明编织结构对冷却性能的影响。首先对编织板进行了薄膜冷却效率实验，验证了数值方法的准确性，该方法具有良好的精度。然后，比较基于这两种模型的结果之间的温度和冷却效率分布。此外，改变内部结构的编织角度以及孔与编织线之间的相对位置，以研究它们对冷却效率和内部温度场的影响。结果表明，内部编织结构对复合板内部的冷却效果和热传导有明显影响，导致冷却效率和温度的不均匀变化。基于这两种模型的平均冷却效率之间的相对差异达到 10.4%。此外，薄膜孔与编织纱之间的相对位置会影响冷却效率非均匀变化的相位。不同相对位置的最大冷却效率之间的相对变化可达10.73%，孔位于横向编织纱线上时冷却性能最佳。编织角会影响板内温度不均匀变化的周期长度。编织角越小冷却性能越好，但影响不显着。