带曲率气膜孔的设计参数敏感性分析及多目标优化

Based on the response surface method, the surrogate models with comprehensive cooling effectiveness and maximum equivalent thermal stress as responses were constructed respectively. The effects of blow ratio and structural parameters (curvature radius, incidence angle, aspect ratio, splay angle) on the cooling and strength of curved fan-shaped film holes were analyzed. The optimization design was carried out to maximize the comprehensive cooling effectiveness and minimize the maximum equivalent thermal stress. Results indicated that the blowing ratio served as the primary factor affecting the average comprehensive cooling effectiveness of curved film holes. When the blowing ratio increased from 0.5 to 1.5, the comprehensive cooling effectiveness increased by more than 43%. And the curvature radius was the main factor influencing the maximum equivalent thermal stress. Specifically, these factors can affect up to 43.15% (concave model) and 48.35% (convex model). Through multi-objective optimization, compared with the reference model, the comprehensive cooling effectiveness of the concave and convex models with the curvature radius of 40 increased by 10.11% and 17.19%, respectively, and the maximum equivalent thermal stress decreased by 26.78% and 9.62%, respectively.