Prediction of flow noise from multiple spoilers in air ducts

Flow noise is noise produced by the interaction of turbulent air flow and in-duct elements such as dampers, sensors, bends, transition pieces, duct corners, branch points, or even splitter attenuators in ventilation ductwork systems. Accurate prediction of flow noise from these in-duct elements is of importance in the design of ductwork systems. Previous works on flow noise prediction and measurement in air ducts will be reviewed in this paper. Previous works conducted by the author and his co-investigators provides a prediction method based on experimental data. In this paper, Computational Fluid Dynamics (CFD) method will be used to compute the mean pressure drop across spoilers and the fluctuating drag forces acting on induct flow spoilers. A method for the prediction of flow noise from multiple in-duct spoilers using CFD will be proposed.