基于某F级燃气轮机第一级动叶栅的数值模拟，以实现动叶端壁气膜冷却全覆盖为目标，分析定常下动叶端壁的流动与传热特征，拟综合考虑端壁二次流结构特征与级间封严冷气泄漏流的影响，将端壁划分为四个具有不同流动传热特征的区域，并据此设计了叶根端壁仅13孔数的离散气膜孔布置方案各区域采取不同的冷却方式根据不同吹风比下的研究结果发现：吹风比为0.75时端壁冷却有效度均值在0.2以上，实现了全端壁冷却的目标；前缘附近端壁冷却效果受吹风比影响显著，吹风比在0.75以上时冷却有效度达到0.5以上；除近压力面区域，气膜冷却效果随吹风比的增大而提高。

Based on the simulation of the first stage rotor of a gas turbine,the characteristics of rotor endwall flow and heat transfer are analyzed.Considering the influence of the secondary flow and rotor-stator purge flow,the endwall is divided into 4 sub-regions with different flow and heat transfer characteristics,and a layout scheme of discrete film hole with 13 holes is designed to achieve full rotor endwall coverage with film.With respect to the flow patterns,different film cooling arrangements are applied.According to the result under different blowing ratio,the mean cooling effectiveness is above 0.2 with blowing ratio of 0.75,and the goal of full endwall coverage is achieved.In the region near leading edge,the cooling effectiveness is significantly affected by the blow ratio; it is above 0.5 when the blow ratio is above 0.75.Additionally,the film cooling effectiveness increases with blow ratio,except the area close to pressure surface.

TK263.3