叶身融合在径向扩压器中的应用初探  

Investigation on Application of Blended Blade and Endwall Technique on Radial Diffuser

作　　者：伊卫林[1] 陈志民[1] 马季[1] 季路成[1] 

机构地区：[1]北京理工大学机械与车辆学院,北京100081

出　　处：《工程热物理学报》2015年第6期1213-1217,共5页Journal of Engineering Thermophysics

基　　金：国家自然科学基金项目(No.51476010;No.51176012)

摘　　要：离心压气机负荷能力持续提升,进一步加重了径向扩压器的工作负担,流道内角区分离是径向扩压器高性能工作的关键制约因素。叶身融合是针对组织与控制角区流动而提出的一项新技术。本文针对一带叶片式扩压器的高压比离心压气机级展开数值模拟,在对原型流动细致分析的基础上,实施吸力面叶身融合设计,在一定程度上推迟和减弱了角区分离,使得峰值效率提高近0.4%,近阻塞点效率提升近0.7%,压比略有提升而喘振裕度未受影响。对比分析了叶身融合设计对流场结构影响,给出了性能改善原因。The corner flow separations in radial diffusers are more and more serious.So they have become the key restrict factors for higher efficiency and wider surge margin designs.Blended blade and endwall is a new technology for organizing and controlling the corner flow separations.Firstly,numerical simulation was carried out on a high pressure ratio centrifugal compressor stage with radial airfoil diffuser and the detail flow field analysis was conducted.Secondly,based on the performance results,it can be found that the BBEW design applied on suction side of diffuser delays and reduces the corner separations and improves the peak efficiency 0.4%,the near choked efficiency0.7%.The pressure ratio increases slightly and the surge margin is not affected.Last,the varieties of corner flow structure under the action of BBEW are demonstrated and the action mechanisms are given.

关 键 词：离心压气机 叶型扩压器 角区分离 吸力面叶身融合 

分 类 号：TH452[机械工程—机械制造及自动化]