Proceedings ArticleDOI
Analytical prediction of vortex lift
TLDR
In this article, general integral expressions are derived for the nonlinear lift and pitching moment of arbitrary wing planforms in subsonic flow. The analysis uses the suction analogy and an assumed pressure distribution based on classical linear theory results.Abstract:
General integral expressions are derived for the nonlinear lift and pitching moment of arbitrary wing planforms in subsonic flow. The analysis uses the suction analogy and an assumed pressure distribution based on classical linear theory results. The potential flow lift constant and certain wing geometric parameters are the only unknowns in the integral expressions. Results of the analysis are compared with experimental data and other numerical methods for several representative wings, including ogee and double-delta planforms. The present method is shown to be as accurate as other numerical schemes for predicting total lift, induced drag, and pitching moment. b c c CL CD Cm CT Cs cc, ccd E2 Nomenclature = aspect ratio = wing span =chord = reference length = lift coefficient = drag coefficient = pitching moment coefficient = thrust coefficient = suction coefficient = section lift coefficient = section induced drag coefficient = section suction coefficient = pressure loading coefficient = drag = proportionality constant, Eq. (32) = proportionality constant, Eq. (53) = chordwise function, Eq. (44) ff(rj) = span wise f unction, Eq. (28) K = potential constant L =lift loading constant, Eq. (5) S = suction force SR = reference area s = suction force per unit length T = leading edge thrust, Eq. (7) T' = leading edge thrust per unit length V = freestream speed Wj = downwash velocity component, Eq. (11) a. = angle of attack F = vorticity p = freestream density £ = nondimensional chordwise coordinate 77 = nondimensional spanwise coordinate A = leading edge sweep angle Subscripts P = potential flow E =edge / = induced VLE = leading edge vortex VSE = side edge vortexread more
Citations
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Journal ArticleDOI
On aerodynamic modelling of an insect–like flapping wing in hover for micro air vehicles
TL;DR: A new conceptual framework is proposed and, within this framework, two analytic approaches to aerodynamic modelling of an insect–like flapping wing in hover in the context of MAVs are proposed.
Journal ArticleDOI
An overview of research on wide-speed range waverider configuration
TL;DR: This paper reviews and classifiesWide-speed-range waverider design methodologies developed up until 2019, including the “combined” wide-speed range waveriders, the variable Mach number waveriding, the vortex lift waverIDER, the dual/multistage waveride, the morphing waverided, and some other wide- speed-range Waverider designs.
Proceedings ArticleDOI
Simplified solution of the compressible lifting surface problem
TL;DR: In this article, a simplified application of planar lifting surface theory is presented for determining the load (distribution on finite wings in compressible subsonic flow) of a single wing.
Journal ArticleDOI
Examination and Prediction of the Lift Components of Low Aspect Ratio Rectangular Flat Plate Wings
TL;DR: In this article , an investigation of the lift components present over low aspect ratio rectangular wings is presented. And the analysis suggests a low sensitivity to Reynolds numbers spanning three orders of magnitude and brings into doubt the realization of a leading edge vortex lift component for wings with unswept leading edges under steady state conditions.
An approximate analytical method for vortex-lift and center of pressure on the slender wing
TL;DR: In this article, a simplified approximate analytical method for predicting vortex lift and center of pressure on slender wings is presented, which is compared with experimental data and gives accurate estimates, and two empirical corrections are proposed.
References
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Journal ArticleDOI
Augmentation of Vortex Lift by Spanwise Blowing
TL;DR: In this paper, an investigation has been conducted to evaluate the aerodynamic effects associated with blowing a jet spanwise over a wing's upper surface in a direction parallel to the leading edge.
Journal ArticleDOI
Leading-Edge-Vortex Augmentation in Compressible Flow
TL;DR: In this article, a wing-body-tail configuration with a cambered and twisted wing with leadingedge flaps was used for vortex augmentation to improve both lift and drag due to lift at high angle of attack for the Mach numbers tested.
Proceedings ArticleDOI
Nonlinear slender wing aerodynamics
L. E. Ericsson,J. P. Reding +1 more
TL;DR: In this paper, the effects of leading edge roundness and trailing edge sweep on the aerodynamic characteristics of delta wings were analyzed and the results indicated that simple analytic tools can be developed to predict the aeroelastic characteristics of the space shuttle ascent configuration with its complicated flow field and aero-elastic cross-couplings.