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Numerical Studies on Fan Casing Vibration and Noise Radiation

[+] Author Affiliations
Jian-Cheng Cai, Da-Tong Qi, Fu-An Lu

Xi’an JiaoTong University, Xi’an, Shaanxi, China

Paper No. GT2009-59225, pp. 255-264; 10 pages
doi:10.1115/GT2009-59225
From:
  • ASME Turbo Expo 2009: Power for Land, Sea, and Air
  • Volume 6: Structures and Dynamics, Parts A and B
  • Orlando, Florida, USA, June 8–12, 2009
  • Conference Sponsors: International Gas Turbine Institute
  • ISBN: 978-0-7918-4887-6 | eISBN: 978-0-7918-3849-5
  • Copyright © 2009 by ASME

abstract

This paper presents a method for predicting casing vibration and noise radiation of a centrifugal fan due to internal fluctuating pressure fields at the blade passing frequency (BPF). Using computational fluid dynamics (CFD) technique based on the finite volume method (FVM), a three-dimensional unsteady simulation of internal flow was carried out by solving the Reynolds averaged Navier-Stokes equations. The oscillating pressure distribution at the volute casing was taken as the excitation of the finite element analysis (FEA) model of the casing structure. Time-domain nodal forces on the casing were obtained by integrating the pressure and viscous stress over the element surfaces. Fast Fourier transform (FFT) was applied to these time series of nodal forces in order to extract the BPF components. Harmonic response analysis was carried out to the casing structure. Sound radiation was finally calculated by the indirect boundary element method (IBEM) with the vibration results as velocity boundary condition. This study shows that it is feasible to use fluid-structure weakly coupled simulations for the prediction of flow-induced casing vibration and noise radiation of centrifugal turbomachinary.

Copyright © 2009 by ASME

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