Journal ArticleDOI
Indicial lift approximations for two-dimensional subsonic flow as obtained from oscillatory measurements
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This article is published in Journal of Aircraft.The article was published on 1993-05-01. It has received 86 citations till now. The article focuses on the topics: Lift coefficient & Incompressible flow.read more
Citations
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Unsteady lift of a flapped airfoil by indicial concepts
TL;DR: In this paper, a practical method for computing the unsteady lift on an airfoil due to arbitrary motion of a trailing-edge flap was described, and the result for the incompressible case was obtained in state-space form by means of Duhamel superposition and employing an improved exponential approximation to Wagner's indicia! lift function.
Journal ArticleDOI
Unsteady aerodynamics of a flapped airfoil in subsonic flow by indicial concepts
TL;DR: In this article, an approach based on indicial concepts is described to model the unsteady airloads on a thin airfoil in subsonic compressible flow caused by the arbitrary motion of a trailing-edge flap.
Journal ArticleDOI
Reduced order unsteady aerodynamic modeling for stability and control analysis using computational fluid dynamics
TL;DR: In this article, the authors present a review of reduced-order aerodynamic models for aircraft stability and control analysis, including linear and nonlinear indicial response methods, Volterra theory, radial basis functions, and a surrogate-based recurrence framework.
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Indicial Aerodynamics in Compressible Flow-Direct Computational Fluid Dynamic Calculations
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On the Influence of Time-Varying Flow Velocity on Unsteady Aerodynamics.
TL;DR: In this paper, the effects of a periodic free-stream velocity on the aerodynamic properties of an airfoil in incompressible flow are examined, and a new general aerodynamic theory for a combination of harmonic pitching, plunging and fore-aft motion is presented.
References
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Journal ArticleDOI
Airfoil Theory for Non-Uniform Motion
Th. von Kármán,W. R. Sears +1 more
TL;DR: In this paper, the lift and moment acting upon an airfoil in the two-dimensional case may be calculated directly from simple physical considerations of momentum and moment of momentum after a calculation of the induction effects of a wake vortex.
Journal ArticleDOI
State-space representation of unsteady airfoil behavior
J. G. Leishman,K. Q. Nguyen +1 more
TL;DR: In this paper, a method is presented to model the unsteady lift, pitching moment, and drag acting on a two-dimensional airfoil operating under attached-flow conditions in a compressible flow.
Journal ArticleDOI
Validation of approximate indicial aerodynamic functions for two-dimensional subsonic flow
TL;DR: In this paper, the Laplace transform was used to produce explicit solutions for idealized harmonic forcings, which were then compared with experimentally obtained pitch and plunge aerodynamic data in the reduced frequency domain.