斜流扩压器任意中弧线造型3维弯扭叶片设计  

Design of Mixed-flow Diffuser 3D Skewed and Twisted Blade Based on Arbitrary Mean Camber Lines

作　　者：杨元英 安志强 李杜 黄生勤 YANG Yuan-ying;AN Zhi-qiang;LI Du;HUANG Sheng-qin(AECC Hunan Aviation Powerplant Research Institute,Zhuzhou Hunan 412002,China;Hunan Key Laboratory of Turbomachin-ery on Small and Medium Aero-Engine,Zhuzhou Hunan 412002,China)

机构地区：[1]中国航发湖南动力机械研究所,湖南株洲412002 [2]中小型航空发动机叶轮机械湖南省重点实验室,湖南株洲412002

出　　处：《航空发动机》2021年第3期23-28,共6页Aeroengine

基　　金：湖南省科技创新人才计划科技领军人才项目(2020RC4035)资助。

摘　　要：为了改善扩压器与叶轮之间的气动匹配,针对斜流/离心叶轮出口复杂的3维流动,以及扩压器叶片不同展向位置气动负荷分布特征,提出基于任意中弧线造型的扩压器3维弯扭叶片设计方法。该方法在根据叶轮出口流场优化扩压器叶片攻角的同时,通过对造型截面中弧线任意调整实现扩压器叶片载荷分布和局部流场细节的优化。以某高压比斜流压气机为平台,采用上述方法完成了对其斜流扩压器的改进设计。3维数值模拟结果表明:与原方案相比,扩压器改进后斜流压气机设计点至近喘点范围内效率提升约0.3个百分点,设计点流量基本不变,设计转速喘振裕度增大1.0个百分点,在设计点及近喘点状态下扩压器通道流场均得到了改善,同时改进后扩压器的叶片数由21片减少至19片。In order to improve the aerodynamic matching between diffuser and impeller,a design method of diffuser 3D skewed and twisted blade based on arbitrary mean camber lines was proposed according to the complex 3D flow at the outlet of mixed-flow/centrifugal impeller and the characteristics of aerodynamic load distributions at the different spanwise positions of diffuser blade.The incidence angle of the diffuser blade was optimized according to the flow from the impeller outlet,meanwhile,the aerodynamic load distributions of and the detailed flow field was improved through arbitrary adjustment of the mean camber lines at the profile design sections.Based on a high pres⁃sure mixed-flow compressor,the method was applied to improve the aerodynamic performance of mixed-flow diffuser.The results of 3D nu⁃merical simulation show that compared with the original scheme,the efficiency of the improved compressor from design point to near surge point is increased by 0.3%,the flow rate at design point is basically unchanged,the surge margin at design speed is increased by 1.0%and the flow field of diffuser channel at design point and near surge point is improved.At the same time,the number of vanes is reduced from 21 to 19.

关 键 词：斜流扩压器 3维弯扭叶片 数值模拟 任意中弧线 航空发动机 

分 类 号：V241.06[航空宇航科学与技术—飞行器设计]