基于参数化造型的气膜冷却优化方法

Optimization Method for Air Film Cooling based on Parametric Modeling

为了探究气膜冷却的优化设计方法,研究并搭建了气膜冷却优化设计平台。利用该优化设计平台能够实现气膜冷却结构的参数化设计、网格自动生成、自动CFD计算及后处理和自动优化寻优过程。同时在该优化平台下,利用试验设计(DOE)方法挑选出了对目标函数影响最大的几个变量。最后利用该优化平台,实现了对某型高压涡轮第一级导叶前缘气膜孔的单目标优化,优化后叶片综合平均冷却效率提高了18.8%,叶片前缘的平均温度降低了40 K。

In order to explore the optimal design method of air film cooling, an optimal design platform of air film cooling is studied and built.The platform can realize the parametric design, automatic grid generation, automatic CFD calculation, post-processing and automatic optimization process of film cooling structure.At the same time, the design of experiment(DOE) method on the optimization platform is used to select the variables that have the greatest influence on the objective function.The optimization platform is used to realize the single objective optimization for the leading edge film hole of the first stage guide blade of a certain high-pressure turbine.After the optimization, the integrated average cooling efficiency of the blade is increased by 18.8%,and the average temperature of the leading edge of the blade is reduced by 40 K.