Investigation on the forced response of a radial turbine under aerodynamic excitations

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• 作者：Chaochen Ma ; Zhi Huang ; Mingxu Qi
• 刊名：Journal of Thermal Science
• 出版年：2016
• 出版时间：April 2016
• 年：2016
• 卷：25
• 期：2
• 页码：130-137
• 全文大小：2,255 KB
• 刊物类别：Physics and Astronomy
• 刊物主题：Physics
  Mechanics, Fluids and Thermodynamics
  Engineering Fluid Dynamics
  Engineering Thermodynamics and Transport Phenomena
  Chinese Library of Science
  
• 出版者：Science Press, co-published with Springer-Verlag GmbH
• ISSN：1993-033X
• 卷排序：25

文摘

Rotor blades in a radial turbine with nozzle guide vanes typically experience harmonic aerodynamic excitations due to the rotor stator interaction. Dynamic stresses induced by the harmonic excitations can result in high cycle fatigue (HCF) of the blades. A reliable prediction method for forced response issue is essential to avoid the HCF problem. In this work, the forced response mechanisms were investigated based on a fluid structure interaction (FSI) method. Aerodynamic excitations were obtained by three-dimensional unsteady computational fluid dynamics (CFD) simulation with phase shifted periodic boundary conditions. The first two harmonic pressures were determined as the primary components of the excitation and applied to finite element (FE) model to conduct the computational structural dynamics (CSD) simulation. The computed results from the harmonic forced response analysis show good agreement with the predictions of Singh's advanced frequency evaluation (SAFE) diagram. Moreover, the mode superposition method used in FE simulation offers an efficient way to provide quantitative assessments of mode response levels and resonant strength.Keywordsradial turbineforced responseaerodynamic excitationFSISAFE diagram