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Title: Aeroacoustics of flow merging at duct junction
Authors: Lam, GCY
Tang, SK 
Leung, RCK 
Issue Date: 2012
Publisher: Acoustical Society of America
Source: Journal of the Acoustical Society of America, 2012, v. 131, no. 4, p. 3467-3467 How to cite?
Journal: Journal of the Acoustical Society of America 
Abstract: Although merging flow at duct junction is always encountered in fluid-transporting systems, previous works were mainly devoted to study the acoustics of duct junction but the aeroacoustics of flow merging has received little attention. Therefore, this paper aims at revealing the mechanism of sound generation by a merging flow at a 30-degree duct junction. The flow problem is investigated numerically by solving the unsteady compressible Navier-Stokes equations and the gas equation of state simultaneously, thus allowing the acoustic field and the aerodynamic field to be determined without modelling the source terms in the wave equation. The Conservation Element and Solution Element (CE/SE) method is chosen as the solver, which has been successfully applied in tackling many aeroacoustic problems. The results show that a shear layer is created between the two flows at duct junction due to the velocity gradient across the flow. Furthermore, another shear layer is also formed at downstream to the edge of duct junction. However, only the latter one rolls up to form vortices, which are believed to be the acoustic source. The contributions of these flow dynamical processes to sound generation and the identification of dominant sources will be discussed.
Description: The Acoustics 2012 Hong Kong: conference and exhibition, a joint meeting of the 163rd meeting of the Acoustical Society of America (ASA), the 8th meeting of the Acoustical Society of China (ASC), the 11th Western Pacific Acoustics Conference (WESPAC) and the Hong Kong Institute of Acoustics (HKIOA), Hong Kong Convention and Exhibition Centre, the People's Republic of China, 13-18 May, 2012
ISSN: 0001-4966
EISSN: 1520-8524
DOI: 10.1121/1.4709071
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