Proceedings ArticleDOI
A Numerical Study of Tandem Pitching Airfoils
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In this paper, a lumped vortex model coupled with vortex dissipation and vortex core criteria is used to study the unsteady flow past tandem pitching airfoils, which is solved using a combined zero-normal flow boundary condition and Kelvin condition.Abstract:
A lumped vortex model coupled with a vortex dissipation and vortex core criteria is used to study the unsteady flow past tandem pitching airfoils. The unsteady wakes of both airfoils are modeled by discrete vortices and time-stepping is used to predict the individual wake shapes. The coupled flow is solved using a combined “zero-normal flow” boundary condition and Kelvin condition which results in (2N+2)X(2N+2) equations. Commercial software FLUENT is also used to study the flow tandem pitching airfoils. Results are presented showing the effect of airfoil-airfoil and airfoil-wake interaction on the aerodynamic characteristics of the tandem airfoils pitching in or out of phase and also when only the leading airfoil pitches and the trailing airfoil is stationary.read more
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References
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Journal ArticleDOI
Dynamic Stall on Advanced Airfoil Sections
TL;DR: In this paper, the dynamic stall characteristics of eight airfoils have been investigated in sinusoidal pitch oscillations over a wide range of two-dimensional unsteady flow conditions.
Dynamic stall experiments on the NACA 0012 airfoil
TL;DR: In this article, a NACA 0012 airfoil undergoing large oscillations in pitch was experimentally studied at a Reynolds number of and over a range of frequencies and amplitudes.
Low-speed aerodynamic characteristics of NACA 0012 aerofoil section, including the effects of upper-surface roughness simulating hoar frost
N. Gregory,C. L. O'Reilly +1 more
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Object-oriented unsteady vortex lattice method for flapping flight
Tracy E. Fritz,Lyle N. Long +1 more
TL;DR: In this article, the unsteady vortex lattice method is used to model the oscillating plunging, pitching, twisting, and flapping motions of a finite-aspect-ratio wing.
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Linearized Euler predictions of unsteady aerodynamic loads in cascades
Kenneth C. Hall,William S. Clark +1 more
TL;DR: In this paper, a linearized Euler solver for calculating unsteady flows in turbomachinery blade rows due to both incident gusts and vibratory blade motion is presented.
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