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Numerical Simulations of the Steady and Unsteady Aerodynamic Characteristics of a Circulation Control Wing AirfoilThe aerodynamic characteristics of a Circulation Control Wing (CCW) airfoil have been numerically investigated, and comparisons with experimental data have been made. The configuration chosen was a supercritical airfoil with a 30 degree dual-radius CCW flap. Steady and pulsed jet calculations were performed. It was found that the use of steady jets, even at very small mass flow rates, yielded a lift coefficient that is comparable or superior to conventional high-lift systems. The attached flow over the flap also gave rise to lower drag coefficients, and high L/D ratios. Pulsed jets with a 50% duty cycle were also studied. It was found that they were effective in generating lift at lower reduced mass flow rates compared to a steady jet, provided the pulse frequency was sufficiently high. This benefit was attributable to the fact that the momentum coefficient of the pulsed jet, during the portions of the cycle when the jet was on, was typically twice as much as that of a steady jet.
Document ID
20030065822
Acquisition Source
Langley Research Center
Document Type
Other
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)
Date Acquired
August 21, 2013
Publication Date
May 31, 2003
Publication Information
Publication: Application of Circulation Control Technology to Airframe Noise Reduction
Subject Category
Aerodynamics
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.
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