Please use this identifier to cite or link to this item: https://doi.org/10.2514/1.J050135
Title: Three techniques to control flow separation in an S-shaped duct
Authors: Ng, Y.T.
Luo, S.C. 
Lim, T.T. 
Ho, Q.W.
Issue Date: Sep-2011
Source: Ng, Y.T., Luo, S.C., Lim, T.T., Ho, Q.W. (2011-09). Three techniques to control flow separation in an S-shaped duct. AIAA Journal 49 (9) : 1825-1832. ScholarBank@NUS Repository. https://doi.org/10.2514/1.J050135
Abstract: The optimum aerodynamic performance of an S-shaped duct (or, more specifically, aircraft air-intake duct) demands relatively uniform flow in the duct with minimal swirl at the exit. Here, three different flow control methods are examined for a large curvature S-shaped duct of uniform square cross section; they are vortex generators, variable directional tangential blowing, and vortex generator jets. The flow control devices were implemented on a common test rig with the same test parameters and hence provide a more accurate comparison of their performance. While these devices are effective at suppressing flow separation at the inside wall of the first bend and reducing total pressure loss, it is shown that this happens at the expense of higher swirl at the duct exit. The increase in the swirl can be attributed partly to the increase in the radial pressure difference (or imbalance) between the side walls and partly to changes in the configuration and position of streamwise vortices near the outside wall of the second bend. The investigation thus illustrates competing aerodynamic performance when flow control devices are implemented in an S-shaped duct. Copyright © 2011 by the American Institute of Aeronautics and Astronautics, Inc.
Source Title: AIAA Journal
URI: http://scholarbank.nus.edu.sg/handle/10635/61571
ISSN: 00011452
DOI: 10.2514/1.J050135
Appears in Collections:Staff Publications

Show full item record
Files in This Item:
There are no files associated with this item.

SCOPUSTM   
Citations

5
checked on Dec 7, 2017

WEB OF SCIENCETM
Citations

3
checked on Nov 23, 2017

Page view(s)

36
checked on Dec 11, 2017

Google ScholarTM

Check

Altmetric


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