摘要
针对带曲率的气膜孔结构构建了以综合冷效和最大等效热应力为响应的代理模型,研究了吹风比及结构参数(曲率半径、入射角、长径比、展向倾角)对带曲率扇形气膜孔冷却及强度特性的影响规律,并以最大化综合冷效和最小化最大等效热应力为优化目标开展了优化设计及分析。结果表明:相对于结构参数,吹风比是带曲率气膜孔面平均综合冷效的主要影响因素,当吹风比从0.5增大至1.5,综合冷效提高43%以上;曲率半径是最大等效热应力的主要影响因素,其对最大等效热应力影响率可达43.15%(凹面模型)和48.35%(凸面模型),且位于曲率半径小的一侧应力集中更显著。相对于基准模型,通过多目标优化使得曲率半径为40的凹面模型和凸面模型综合冷效分别提高10.11%和17.19%,最大等效热应力分别降低26.78%和9.62%。
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.
作者
任书锐
朱剑琴
程泽源
伏蓉
REN Shurui;ZHU Jianqin;CHENG Zeyuan;FU Rong(School of Energy and Power Engineering,Beihang University,Beijing 100191,China;Tianmushan Laboratory,Hangzhou 310023,China)
出处
《航空动力学报》
北大核心
2025年第7期157-168,共12页
Journal of Aerospace Power
基金
国家科技重大专项(Y2022-Ⅲ-0002-0011)
国家自然科学基金(52122604)。
关键词
曲率
扇形气膜孔
响应面设计
综合冷效
热应力
敏感性分析
多目标优化
curvature
fan-shaped film hole
response surface design
comprehensive cooling effectiveness
thermal stress
sensitivity analysis
multi-objective optimization
