机械科学与技术2024，Vol.43Issue(8)：1333-1340,8.DOI:10.13433/j.cnki.1003-8728.20230002
对旋风机新形叶片流致振动特性
Flow-induced Vibration Characteristics of New Shape Blade of Contra-rotating Fan
摘要
Abstract
In order to optimize the fluid-induced vibration characteristics of contra-rotating fan,a new shape blade with good performance and vibration reduction function was proposed by modifying the airfoil.The flow field performance of two contra-rotating fans were compared.The modal analysis was used to predict the resonance of two blades.With the unsteady pressure pulsation on the blade surface as fluid exciting force,andthe forced vibration response of blade monitoring point was calculated by using the modal superposition method.The results show that the new blade has a good aerodynamic performance,the forward aerodynamic performance is similar to that of the original fan,and the reverseaerodynamic performance is better than that of the original fan.At the rated speed,the frequency margin of the first stage new blade is 8.9%higher than that of the original blade,and the operation is safer.The maximum peak vibration acceleration response of the new blade monitoring point is lower than that of the original blade,and the new blade has a good damping effect.Comparing with the monitoring point of first-stage blade,the total vibration acceleration difference of the two blades at the second-stage blade monitoring point is the largest andthe damping effect of the new blade is more obvious,and the maximum difference is about 10.83 dB.关键词
对旋风机/新形叶片/激振力/模态/流致振动Key words
contra-rotating fan/new shape blade/exciting force/mode/flow-induced vibration分类
机械工程引用本文复制引用
常越勇,姜华,宫武旗,张子惠..对旋风机新形叶片流致振动特性[J].机械科学与技术,2024,43(8):1333-1340,8.基金项目
国家科技重大专项(2017-V-0012-0064)与国家重点研发计划(2018YFB0606104) （2017-V-0012-0064）
