Results 241 to 250 of about 31,802 (273)

Reduced-Order Models for Nonlinear Unsteady Aerodynamics

AIAA Journal, 2000
Two reduced-order modeling approaches for the evaluation of nonlinear aerodynamic forces based on CFD computations are presented. These reducedorder models (ROMs) provide a means for rapid calculation of frequency-domain generalized aerodynamic forces, which can be used in traditional flutter analysis scheme, to calculate flutter characteristics about ...
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Unsteady Aerodynamics of Membrane Airfoils

46th AIAA Aerospace Sciences Meeting and Exhibit, 2008
An experimental study of unsteady aerodynamics of two-dimensional membrane airfoils has been conducted. Measurements of membrane shape with a high-speed camera were complemented with the measurements of unsteady velocity field with a Particle Image Velocimetry (PIV) system and flow visualization.
Pinunta Rojratsirikul, Zhijin Wang, Ismet Gursul   +2 more
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Unsteady aerodynamics: retrospect and prospect

The Aeronautical Journal, 1999
AbstractThis paper reviews some current problems in unsteady aerodynamics and discusses some future challenges. The emphasis is on problems associated with separated flows, such as buffeting and limit cycle oscillations. Suggestions are made to indicate how experimental facilities (such as cryogenic windtunnels) and computational fluid dynamics might ...
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Separated flow unsteady aerodynamic theory

Journal of Aircraft, 1985
A relatively simple two-dimensional subsonic unsteady aerodynamic theory has been developed to take into account approximately the effect of flow separation on unsteady airloads for high incidence angles of thin airfoil sections. The theory is an extension of the classical linear potential flow theory for thin airfoils with proper boundary conditions ...
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Unsteady aerodynamics in ornithopter flight

SPIE Proceedings, 2013
The investigation of unsteady aerodynamics is becoming a more attractive topic of research in enhancing flight capabilities. Natural flyers such as birds and insects can undergo flight maneuvers that are very difficult or impossible to accomplish with man-made flyers and current classical aerodynamic theory.
Juan C. Gomez, Matthew J. Bryant, Ephrahim Garcia   +2 more
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Studies in Non-Linear Unsteady Aerodynamics

1986
Abstract : A research program in non-linear unsteady aerodynamics is summarized. New computational and theoretical methods ideally suited for viscous unsteady aerodynamic problems are described. Improved understanding of important physical processes involved in non-linear unsteady aerodynamics are discussed.
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Cobra maneuver unsteady aerodynamic considerations

Journal of Aircraft, 1995
Introduction T HE "COBRA" maneuver, performed by Pougachev at the 1989 Paris air show with the Soviet Su-27 "Flanker," ' and later performed also with a MiG-29 at the Canadian National Air Show in Ottawa, requires lateral high-alpha stability superior to what until then had been demonstrated by other aircraft. One conclusion that has been drawn is that
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Control of Unsteady Aerodynamic Forces

1990
Abstract : The aerodynamic properties of an airfoil under unsteady conditions are very different from ones in steady conditions because the vortex generated by unsteady separation greatly modifies the loading on the wing. In this study, a fundamental approach was taken to investigate the lift and the velocity field of unsteady airfoils.
Mario Lee, Hank Lin, Chiang Shih, Ismet Gursul, Chih-Ming Ho   +4 more
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Fundamentals of Modern Unsteady Aerodynamics

2011
INTRODUCTION.- FUNDAMENTAL EQUATIONS.- INCOMPRESSIBLE FLOW ABOUT AN AIRFOIL.- INCOMPRESSIBLE FLOW ABOUT THIN WINGS.- SUBSONIC and SUPERSONIC FLOWS.- TRANSONIC FLOW.- HYPERSONIC FLOW.- MODERN SUBJECTS.- AERODYNAMICS: The OUTLOOK for the ...
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Unsteady Aerodynamics

2023
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