Application of the aeroacoustic analogy to a shrouded, subsonic, radial fan.

CAA;CFD;radial fan;aeroacoustics

Bryan Buccieri

University:University of Louisville

Department:Mechanical Engineering

关键词: CAA;    CFD;    radial fan;    aeroacoustics;   

Others  :  https://ir.library.louisville.edu/cgi/viewcontent.cgi?article=3286&context=etd

美国|英语

来源: The Universite of Louisville's Institutional Repository

【 摘 要 】

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.