摘要
气膜冷却作为涡轮叶片中一种行之有效的冷却技术,其中气膜冷却孔的出口孔形对气膜冷却效率的提升具有重要影响。采用B样条曲线对气膜冷却孔进行参数化建模,设计了由11个控制变量定义的B样条曲线来精确调控孔形结构,并结合CFD数值模拟和优化算法进行全局优化。研究结果表明,最优孔形相比于扇形孔在前缘区域表现出向内收缩并展向扩张的特征,后缘则呈现类似于心形孔的内凹特征。该孔形结合了心形孔与扇形孔在气膜冷却性能上的优势,在流向方向上提高了中心气膜冷却强度,在展向方向的覆盖能力得以加强,表现出优异的气膜冷却性能。在吹风比M=1条件下,与扇形孔相比,最优孔形的气膜冷却效率提高了13.6%,均匀性指数提升了5.11%。研究提出B样条参数化与优化算法全局寻优的气膜冷却孔形设计方法,为涡轮叶片气膜冷却优化设计提供了有价值的参考。
Film cooling is an effective cooling technique for cooling turbine blades,where the shape of the outlet holes plays a critical role in enhancing cooling efficiency.Parametric modeling of the film cooling holes is performed using B-spline curves,which are defined by 11 control variables to precisely control the hole shape.This is combined with CFD numerical simulation and optimization algorithm for global optimization.The results show that the optimized hole shape exhibits inward contraction and outward expansion at the leading edge compared to the fan-shaped hole,while the trailing edge shows a concave feature similar to the heart-shaped hole.This hole shape combines the advantages of both heart-shaped and fan-shaped holes with respect to film cooling performance.It increases the cooling intensity at the center along the flow direction and improves coverage in the spanwise direction,demonstrating excellent film cooling performance.Under a blowing ratio of M=1,the film cooling efficiency of the optimal hole shape increases by 13.6%compared to the fan-shaped hole,while the uniformity index improves by 5.11%.The study proposes a B-spline parameterization and optimization algorithm for the global optimization of film cooling hole designs,providing valuable insights for the optimization design of turbine blade film cooling.
作者
张传亮
刘瑞
宋权斌
王子艺
ZHANG Chuanliang;LIU Rui;SONG Quanbin;WANG Ziyi(College of Energy and Power Engineering,Changsha University of Science&Technology,Changsha 410114)
出处
《机械工程学报》
北大核心
2025年第20期165-173,共9页
Journal of Mechanical Engineering
基金
湖南省自然科学基金(2024JJ9177)资助项目。
关键词
气膜冷却
B样条曲线
最优孔形
优化算法
均匀性指数
film cooling
B-spline curves
optimal hole shape
optimization algorithm
uniformity index
