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一种新颖的离心叶轮多工况气动优化设计方法
刘基盛1,李威1,计良2,刘漫贤3,贺可太1,方鹏程4
1.北京科技大学 机械工程学院,北京 100083;2.北京航天新立科技有限公司,北京 100074;3.中国科学院自动化研究所,北京 100190;4.清华大学 工业工程系,北京 100084
摘要:
为了改善离心叶轮多工况的气动性能,提出了一种基于切比雪夫算子排序的改进NSGA-II算法,结合新颖的基于计算机图形学的双Bezier曲面参数化设计方法,并利用全三维流体动力学数值计算得到最优性能的叶轮。以某一燃料电池中的离心叶轮为研究对象,对额定工况和常用工况的等熵效率进行全局多目标寻优。优化结果表明,额定工况点等熵效率提高1.13%,质量流量提高5.47%,总压比提高1.4%。常用工况点等熵效率提高1.07%,质量流量提高8.3%,总压比提高0.35%,优化效果较为明显。
关键词:  离心叶轮  多工况优化  改进NSGA-II算法  曲面参数化  种群多样性
DOI:10.13675/j.cnki.tjjs.210638
分类号:V231.1
基金项目:国家重点研发计划(2020YFB1709101)。
A Novel Multi-Condition Aerodynamic Optimization Design Method for Centrifugal Impeller
LIU Ji-sheng1, LI Wei1, JI Liang2, LIU Man-xian3, HE Ke-tai1, FANG Peng-cheng4
1.School of Mechanical Engineering,University of Science and Technology Beijing,Beijing 100083,China;2.Beijing Shiny Technology Co.,Ltd,Beijing 100074,China;3.Institute of Automation,Chinese Academy of Sciences,Beijing 100190,China;4.Department of Industrial Engineering,Tsinghua University,Beijing 100084,China
Abstract:
In order to improve the aerodynamic performance of centrifugal impeller under multiple operating conditions, an improved NSGA-II algorithm based on Chebyshev operator ordering is proposed, combined with a novel computer graphics-based dual Bezier surface parametric design method and full three-dimension CFD numerical calculations to obtain the impeller with optimal performance. A centrifugal impeller in a fuel cell is used as the object of study, and the global multi-objective search for the isentropic efficiency of the rated operating condition point and normal operating condition point is performed. The optimization results show that the efficiency of rated operating conditions had an increase of 1.13%, mass flow increase of 5.47% and total pressure ratio increase of 1.4%. The efficiency of normal operating conditions had an increase of 1.07%, mass flow increase of 8.3%, and total pressure ratio increase of 0.35%, and the optimization effect is more obvious.
Key words:  Centrifugal impeller  Multi-condition optimization  Improved NSGA-II algorithm  Surface parameterization  Population diversity