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Computational Evaluation of the Steady and Pulsed Jet Effects on the Performance of a Circulation Control Wing SectionCirculation Control technology is a very effective way of achieving high lift forces required by aircraft during take-off and landing. This technology can also directly control the flow field over the wing. Compared to a conventional high-lift system, a Circulation Control Wing (CCW) can generate comparable or higher lift forces during take-off/landing with fewer or no moving parts and much less complexity. In this work, an unsteady three-dimensional Navier-Stokes analysis procedure has been developed and applied to Circulation Control Wing configurations. The effects of 2-D steady jets and 2-D pulsed jets on the aerodynamic performance of CCW airfoils have been investigated. It is found that a steady jet can generate very high lift at zero angle of attack without stall, and that a small amount of blowing can eliminate vortex shedding at the trailing edge, a potential noise source. It is also found that a pulsed jet can achieve the same high lift as a steady jet at lower mass flow rates, especially at a high frequency, and that the Strouhal number has a more dominant effect on the pulsed jet performance than just the frequency or the free-stream velocity.
Document ID
20050192630
Acquisition Source
Langley Research Center
Document Type
Conference Paper
Authors
Liu, Yi
(Georgia Inst. of Tech. Atlanta, GA, United States)
Sankar, Lakshmi N.
(Georgia Inst. of Tech. Atlanta, GA, United States)
Englar, Robert J.
(Georgia Inst. of Tech. Atlanta, GA, United States)
Ahuja, Krishan K.
(Georgia Inst. of Tech. Atlanta, GA, United States)
Gaeta, R.
(Georgia Inst. of Tech. Atlanta, GA, United States)
Date Acquired
September 7, 2013
Publication Date
June 1, 2005
Publication Information
Publication: Proceedings of the 2004 NASA/ONR Circulation Control Workshop, Part 1
Subject Category
Fluid Mechanics And Thermodynamics
Funding Number(s)
CONTRACT_GRANT: NAG1-2146
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.
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