叶轮倒角尺度对大流量离心压缩机气动和疲劳寿命的影响分析  

Analysis for the Influence of Impeller Fillet Size on Aerodynamic and Fatigue Life of High-flow Centrifugal Compressor

作　　者：朱亚迪 陈洪粉 冀春俊[1] 鲁业明 ZHU Ya-di;CHEN Hong-fen;JI Chun-jun;LU Ye-ming(College of Energy and Power Engineering,Dalian University of Technology,Dalian,China,Post Code:116024;Dongfang Turbine Co.,Ltd.,Dongfang Electric Corporation,Deyang,China,Post Code:618000)

机构地区：[1]大连理工大学能源与动力工程学院,辽宁大连116024 [2]东方电气集团东方汽轮机有限公司,四川德阳618000

出　　处：《热能动力工程》2024年第1期59-67,78,共10页Journal of Engineering for Thermal Energy and Power

基　　金：国家自然科学基金(52005073);中央高校基本科研业务费(DUT22RC(3)041)。

摘　　要：为了分析不同倒角尺度对压缩机气动性能及疲劳寿命的影响,首先在控制离心叶轮主要结构参数不变的前提下,通过调整叶片根部及顶部倒角尺度得到一系列设计模型,其次通过数值模拟方法对不同设计模型的离心压缩机整级进行全三维稳态模拟并在设计转速下对离心叶轮进行强度计算,最后联合估算法及材料曲线计算叶轮部件疲劳寿命。结果表明:与倒角半径相比,倒角角度对气动性能的影响更加显著,在大流量点倒角角度造成等熵效率减小幅度达5%左右,总压比减小幅度达0.07左右;与倒角角度相比,倒角半径更有利于减小应力值;选取经验参数对不同倒角尺度的离心叶轮进行估算得到的疲劳寿命值与实验值偏差最大为3%,最小仅为0.09%。For the purpose of analyzing the influence of different fillet sizes on the aerodynamic performance and fatigue life of the compressor,firstly,a series of design models were obtained by adjusting the fillet size of the root and top of the blade under the premise that the main structural parameters of the centrifugal impeller remained unchanged;secondly,the full three-dimensional steady-state simulation of the whole stage of the centrifugal compressor of different design models was carried out by numerical simulation method,and the strength of the centrifugal impeller was calculated at the design speed;and finally the fatigue life of the impeller components was calculated by the estimation method and the material S-N curve.The results show that compared with the fillet radius,the influence of the fillet angle on the aerodynamic performance is more significant,the isentropic efficiency is reduced by about 5% and the total pressure ratio is reduced by about 0.07 caused by fillet angle at the large flow point;compared with the fillet angle,the fillet radius is more conducive to reducing the stress value;and the fatigue life value estimated by empirical parameters for the centrifugal impeller with different fillet sizes deviates from the experimental value by 3% at the maximum and 0.09% at the minimum.

关 键 词：离心叶轮 倒角 气动性能 强度 疲劳寿命 

分 类 号：TH452[机械工程—机械制造及自动化]