Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/36098
Title: Aeroacoustics of duct junction flows merging at different angles
Authors: Lam, GCY
Leung, RCK 
Tang, SK 
Issue Date: 2014
Source: Journal of sound and vibration, 2014, v. 333, no. 18, p. 4187-4202
Abstract: This paper reports an exploratory study of the aeroacoustics of a merging flow at a duct junction with the same width in all branches and different merging angles. The focus is put on the acoustic generation due to the flow unsteadiness. The study is carried out by the direct aeroacoustic simulation (DAS) approach, which solves the unsteady compressible Navier-Stokes equations and the perfect gas equation of state simultaneously using the conservation element and solution element (CE/SE) method. The Mach number based on the maximum inlet velocity of side branch is 0.1 and the Reynolds number of the flow based on duct width and this velocity is 2.3 x 10(5). The numerical simulations are performed in two dimensions and the aeroacoustics at different merging angles (30 degrees, 45 degrees, 60 degrees and 90 degrees) are studied. Both the levels of unsteady interactions of merging flow structures and the efficiency of the acoustic generation are observed to increase with the merging angles, where the increase in acoustic efficiency can be up to three orders of magnitude. The major acoustic source is found to be the fluctuating wall pressure induced by the flow unsteadiness in the downstream branch. A scaling law between the wall fluctuating force and the acoustic efficiency is also derived.
Publisher: Academic Press
Journal: Journal of sound and vibration 
ISSN: 0022-460X
EISSN: 1095-8568
DOI: 10.1016/j.jsv.2014.04.045
Appears in Collections:Journal/Magazine Article

Access
View full-text via PolyU eLinks SFX Query
Show full item record

SCOPUSTM   
Citations

7
Last Week
0
Last month
Citations as of Feb 16, 2020

WEB OF SCIENCETM
Citations

4
Last Week
0
Last month
Citations as of Sep 26, 2020

Page view(s)

178
Last Week
0
Last month
Citations as of Sep 29, 2020

Google ScholarTM

Check

Altmetric


Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.