Prediction of flow-generated noise produced by in-duct elements

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Prediction of flow-generated noise produced by in-duct elements


Author: Au, Wing-man
Title: Prediction of flow-generated noise produced by in-duct elements
Degree: M.Eng.
Year: 2007
Subject: Hong Kong Polytechnic University -- Dissertations.
Fluid dynamics -- Mathematical models.
Air ducts -- Noise -- Mathematical models.
Department: Dept. of Building Services Engineering
Pages: xvi, 99 leaves : ill. (some col.) ; 30 cm.
Language: English
InnoPac Record:
Abstract: The engineering approach in this study is similar to those used in other research on prediction of flow-generated noise. The objective of the study is to investigate the feasibility of developing an alternative method where information provided by Computational Fluid Dynamics (CFD) can be employed to develop a prediction method for flow-generated noise. The CFD simulation model was based on the experiment of Oldham and Ukpoho [1]. The experimental results obtained by Oldham and Ukpoho were processed and compared with the CFD predictions. The accuracy of the simulation model was also verified. Turbulence-based Prediction Technique for flow-generated noise was further developed for circular duct in this study. It is based on the relationship between the sound power generated and the turbulent kinetic energy in the vicinity of a spoiler. The sound power level of flow-generated noise is related to the total turbulent kinetic energy in the vicinity of spoiler which can be provided by the CFD simulation models. Based on the Oldham and Ukpoho's theory and experimental results, a collapse of the data were obtained form the simulation models. The data collapsed from the simulation models were different to those from the experiment of other investigators. Although the results obtained from the simulation are different from those obtained in other investigators, the trends of those curves were similar. The trend line obtained from the simulation in this study should be applicable to prediction of flow-generated noise of a particular spoiler with different air inlet velocities in circular duct.

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