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http://dx.doi.org/10.6108/KSPE.2018.22.4.024

Forced Vibration and Structural Response Prediction for Impeller in Resonant Conditions due to Diffuser Vanes  

Kim, Yongse (Department of Mechanical and Aerospace Engineering, Seoul National University)
Kong, Dongjae (Department of Mechanical and Aerospace Engineering, Seoul National University)
Shin, SangJoon (Department of Mechanical and Aerospace Engineering, Seoul National University)
Park, Kihoon (Hanhwa Power Systems Co., Ltd.)
Im, Kangsoo (Hanhwa Power Systems Co., Ltd.)
Publication Information
Journal of the Korean Society of Propulsion Engineers / v.22, no.4, 2018 , pp. 24-35 More about this Journal
Abstract
Impeller blades in the centrifugal compressor are subjected to periodic aerodynamic excitations by interactions between the impeller and the diffuser vanes (DV) in resonant conditions. This may cause high cycle fatigue (HCF) and eventually result in failure of the blades. In order to predict the structural response accurately, the aerodynamic excitation and the major resonant conditions were predicted using unsteady computational fluid dynamics (CFD) and structural analysis. Then, a forced vibration analysis was performed by going through one-way fluid-structure interaction (FSI). A numerical analysis procedure was established to evaluate the structural safety with respect to HCF. The numerical analysis procedure proposed in this paper is expected to contribute toward preventing HCF problems in the initial design stage of an impeller.
Keywords
Impeller; Diffuser Vanes; Aerodynamic Excitation; Forced Vibration; Fluid-structure Interaction;
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