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    王跃方

    • 教授     博士生导师   硕士生导师
    • 性别:男
    • 毕业院校:大连理工大学
    • 学位:博士
    • 所在单位:力学与航空航天学院
    • 学科:动力学与控制. 工程力学. 计算力学
    • 办公地点:大连理工大学,力学楼505室。
    • 联系方式:电子邮件:yfwang@dlut.edu.cn,QQ号:1043160457。
    • 电子邮箱:yfwang@dlut.edu.cn

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    RANDOM VIBRATION ANALYSIS FOR CENTRIFUGAL COMPRESSOR IMPELLERS WITH UNSTEADY AERODYNAMIC EXCITATIONS

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    论文类型:会议论文

    发表时间:2016-06-13

    收录刊物:EI、CPCI-S、SCIE

    卷号:7B-2016

    关键字:Impeller; Compressor; Unsteady flow; Random vibration; Power spectrum

    摘要:Dynamic response of impeller of centrifugal compressor is studied considering pulsating pressure field on blades due to unsteady flow conditions. The aerodynamic forces on the blades are modeled as random load whose spectral characteristics are determined through computational fluid dynamic simulations in the time domain. The dynamical response in the unsteady case is solved as a random vibration problem in the frequency domain which provides useful power spectral density displacement and stress for early stage of impeller design. A semi-open impeller mounted with 19 blades is modeled using three dimensional solid finite elements. The random vibration problem of the impeller is solved through the Pseudo-Excitation Method considering spatial variance of the pressure field. A user-defined module is developed based on harmonic analysis to generate the auto power spectral density and variance of displacement and stress at 200 nodes. It is demonstrated that solving a random vibration problem through the Pseudo-Excitation Method is faster than the commonly adopted multiple-step transient analysis. It is concluded that evaluating the structural integrity of impeller solids in the regime of random vibration is a feasible and efficient approach at the early design stage of compressors.