基于循环平稳分析的混流风机流致激励特性研究  

The Study of Flow-induced Excitation Characteristics of Mixed-flow Fan Based on Cyclostationary Analysis

作　　者：张钧[1] 李诗徉 戴美军 吴少文 吴大转[1] Jun Zhang;Shi-yang Li;Mei-jun Dai;Shao-wen Wu;Da-zhuan Wu(College of Energy Engineering,Zhejiang University;Hangzhou Zhixin Electromechanical Design Co.,Ltd.;Zhejiang Jindun Fan Co.,Ltd.)

机构地区：[1]浙江大学能源工程学院 [2]杭州智新机电设计有限公司 [3]浙江金盾风机股份有限公司

出　　处：《风机技术》2024年第6期14-18,共5页Chinese Journal of Turbomachinery

基　　金：核技术研发科研项目。

摘　　要：本文将CFD数值模拟分析和循环平稳分析相结合,研究混流风机内部流致激励源对声振信号的幅值调制作用。对混流风机声振信号进行建模,分析声振信号中的信号组分,基于二阶循环平稳统计量和声振信号的二阶统计特性,对混流风机不同流量下声振信号进行解调分析和特征频率提取,与数值模拟得到的压力脉动频谱相互验证,揭示了混流风机内部流致激励源对声振信号的调制机理,对混流风机的低噪声和低振动设计具有指导意义。This paper combines CFD numerical simulation analysis with cyclostationary analysis to study the effect of flow-induced excitation sources inside mixed-flow fan on the modulation of acoustic vibration signal.By modeling the acoustic vibration signal of mixed-flow fan and analyzing the signal components,demodulation analysis and feature frequency extraction of acoustic vibration signal under different flow rates of mixed-flow fan are conducted based on second-order cyclostationary statistics and the second-order statistical characteristics of acoustic vibration signal.The results are cross-validated with the pressure pulsation spectra obtained from numerical simulation,revealing the modulation mechanism of flow-induced excitation sources on acoustic vibration signal within mixed-flow fan.This research has significant guiding implications for the low-noise and low-vibration design of mixed-flow fan.

关 键 词：循环平稳 混流风机 声振信号 流致激励 压力脉动 数值模拟 

分 类 号：TH432.2[机械工程—机械制造及自动化]