Date on Master's Thesis/Doctoral Dissertation

12-2015

Document Type

Master's Thesis

Degree Name

M.S.

Department

Mechanical Engineering

Degree Program

Mechanical Engineering, MS

Committee Chair

Richards, Chris

Committee Co-Chair (if applicable)

Lian, Yongsheng

Committee Member

Lian, Yongsheng

Committee Member

Berson, Eric

Author's Keywords

CAA; CFD; radial fan; aeroacoustics

Abstract

A study was conducted to investigate the predictive capability of computational aeroacoustics with respect to a shrouded, subsonic, radial fan. A three dimensional unsteady fluid dynamics simulation was conducted to produce aerodynamic data used as the acoustic source for an aeroacoustics simulation. Two acoustic models were developed: one modeling the forces on the rotating fan blades as a set of rotating dipoles located at the center of mass of each fan blade and one modeling the forces on the stationary fan shroud as a field of distributed stationary dipoles. Predicted acoustic response was compared to experimental data. The blade source model predicted overall far field sound power levels within 7 dBA and the shroud model predicted overall far field sound power levels within 14 dBA. Doubling the density of the computational fluids mesh and using a scale adaptive simulation turbulence model increased broadband noise accuracy. However, computation time doubled and the accuracy of the overall sound power level prediction improved by only 1 dBA.

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