Investigation of the discrete effects of suction in large scale arrays for Laminar flow control

Crowley, B.J. & Atkin, C.J. (2016). Investigation of the discrete effects of suction in large scale arrays for Laminar flow control. In: 34th AIAA Applied Aerodynamics Conference. . Reston, VA, United States: American Institute of Aeronautics and Astronautics. ISBN 9781624104374

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Abstract

An experimental investigation of the destabilising effects of discrete suction perforations for laminar flow control applications was performed. This research was aimed at investigation of the flow physics of large arrays of discrete perforated suction arrays in globally two-dimensional flows. This research also investigated the effect of varying perforation size, free-stream velocity and suction volume flow rate on the amplification and attenuation of excited travelling waves in a two-dimensional laminar flow. It was found that instead of creating local instabilities that destabilise all frequencies, strong suction had the effect of introducing low frequency disturbances while attenuating naturally produced and excited travelling waves for all test cases considered. If the suction was sufficiently strong these low frequency disturbances would appear to dominate over the stabilising effect of suction (on the natural and excited modes). Possible explanations for these disturbances include viscous or acoustic disturbances located within the suction system. Future experiments will attempt to isolate the effect of the plenums to determine if this is the source of these low frequency disturbances.

Item Type: Book Section
Additional Information: Copyright © 2016 by City University London. Published by the American Institute of Aeronautics and Astronautics, Inc.
Subjects: T Technology > TL Motor vehicles. Aeronautics. Astronautics
Divisions: School of Engineering & Mathematical Sciences > Engineering
URI: http://openaccess.city.ac.uk/id/eprint/16586

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