离心叶轮全三维优化结果的敏感参数分析  

Analysis on Sensitive Parameters of Full-3D Optimization of a Centrifugal Impeller

作　　者：张啸天 姬成 张晨庆 席光[1] ZHANG Xiaotian;JI Cheng;ZHANG Chenqing;XI Guang(School of Energy and Power Engineering,Xi'an Jiaotong University,Xi'an 710049,China)

机构地区：[1]西安交通大学能源与动力工程学院,西安710049

出　　处：《工程热物理学报》2024年第9期2646-2655,共10页Journal of Engineering Thermophysics

基　　金：国家自然科学基金资助项目(No.52130603)。

摘　　要：本文采用Sobol敏感性分析方法提取了114个控制参数下离心叶轮的气动性能敏感参数,通过基线叶轮与优化叶轮内部流场的对比,研究了离心叶轮全三维优化结果流动机理层次的依据及合理性。结果表明:堵塞流量敏感参数位置接近叶轮喉部,说明敏感性分析方法能找到特定气动性能的关键控制参数。压比敏感参数分布在叶片尾缘,优化叶轮对尾缘形状的改变提高了扩压器入口的相对气流角均匀度,同时没有改变叶轮出口沿展向压力相对分布情况;效率敏感参数集中于主叶片前缘,优化叶轮对叶片前缘凹凸的控制减小了冲击损失与二次流损失,实现了效率的提升。进一步研究控制参数高阶交互作用后,敏感性分析方法可用于减少全三维优化方法的控制参数量,提高优化速度。This paper employs the Sobol sensitivity analysis method to extract aerodynamic performance sensitive parameters under 114 control parameters for centrifugal impellers.By comparing the internal flow fields of the baseline and optimized impellers,this research examines the basis and rationality of the flow mechanism hierarchy for the full three-dimensional optimization results of centrifugal impellers.The findings indicate that the sensitive parameters for blockage flow are located near the throat of the impeller,demonstrating that sensitivity analysis methods can identify key control parameters for specific aerodynamic performance.The sensitive parameters for pressure ratio are distributed at the trailing edge of the blades.Modification of the optimized impeller's trailing edge shape has improved the uniformity of the relative flow angle at the diffuser inlet without altering the relative pressure distribution along the span at the impeller outlet;The sensitive parameters for efficiency are concentrated at the leading edge of the main blade.The optimized impeller's control over the convexity and concavity of the blade leading edge has reduced shock and secondary flow losses,achieving an improvement in efficiency.After further research into the high-order interactions of control parameters,sensitivity analysis methods can be used to reduce the number of control parameters and increase the speed of the full three-dimensional optimization approach.

关 键 词：离心叶轮 全三维优化方法 Sobol敏感性分析 优化机制分析 

分 类 号：TH452[机械工程—机械制造及自动化]