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International Journal of Aerospace Engineering
Volume 2017, Article ID 8253264, 24 pages
https://doi.org/10.1155/2017/8253264
Research Article

Effects of Active and Passive Control Techniques on Mach 1.5 Cavity Flow Dynamics

Department of Mechanical Engineering, TOBB University of Economics and Technology, Sogutozu Cad. No. 43, 06560 Ankara, Turkey

Correspondence should be addressed to Selin Aradag; moc.liamg@gadaraniles

Received 27 December 2016; Revised 30 March 2017; Accepted 20 April 2017; Published 25 May 2017

Academic Editor: Mahmut Reyhanoglu

Copyright © 2017 Selin Aradag et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

Supersonic flow over cavities has been of interest since 1960s because cavities represent the bomb bays of aircraft. The flow is transient, turbulent, and complicated. Pressure fluctuations inside the cavity can impede successful weapon release. The objective of this study is to use active and passive control methods on supersonic cavity flow numerically to decrease or eliminate pressure oscillations. Jet blowing at several locations on the front and aft walls of the cavity configuration is used as an active control method. Several techniques are used for passive control including using a cover plate to separate the flow dynamics inside and outside of the cavity, trailing edge wall modifications, such as inclination of the trailing edge, and providing curvature to the trailing edge wall. The results of active and passive control techniques are compared with the baseline case in terms of pressure fluctuations, sound pressure levels at the leading edge, trailing edge walls, and cavity floor and in terms of formation of the flow structures and the results are presented. It is observed from the results that modification of the trailing edge wall is the most effective of the control methods tested leading to up to 40 dB reductions in cavity tones.