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

作　　者：常越勇 姜华[1] 宫武旗[2] 张子惠 CHANG Yueyong;JIANG Hua;GONG Wuqi;ZHANG Zihui(School of Energy,Xi'an University of Science and Technology,Xi'an 710054,China;School of Energy and Power Engineering,Xi'an Jiaotong University,Xi'an 710049,China)

机构地区：[1]西安科技大学能源学院,西安710054 [2]西安交通大学能源与动力工程学院,西安710049

出　　处：《机械科学与技术》2024年第8期1333-1340,共8页Mechanical Science and Technology for Aerospace Engineering

基　　金：国家科技重大专项(2017-V-0012-0064);国家重点研发计划(2018YFB0606104)。

摘　　要：为了优化对旋风机的流致振动特性,以某对旋风机叶片为研究对象,通过修改翼型的方式来提出一种性能良好且具有减振功能的新形叶片。比较了两种对旋风机流场性能,采用模态分析法进行了两种叶片的共振预测,以叶片表面非定常压力脉动作为叶片所受流体激振力,采用模态叠加法计算了两种叶片监控点强迫振动响应特性。结果表明:新形叶片具有良好的气动性能,正风性能与原始风机相差不大,反风性能优于原始风机;额定转速下,一级新形叶片相较原始叶片频率余量提高了8.9%,运行更安全;新形叶片监控点振动加速度响应最大峰值均低于原始叶片,新形叶片具有良好的减振效果;相较于一级叶片监控点,二级叶片监控点处两种叶片总振动加速度级差值最大,新形叶片减振效果更明显,且最大差值约为10.83 dB。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 

分 类 号：TH43[机械工程—机械制造及自动化]