Topic
Pitching moment
About: Pitching moment is a research topic. Over the lifetime, 3213 publications have been published within this topic receiving 38721 citations.
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TL;DR: In this paper, large-eddy simulations of flow over a pitching airfoil are conducted to study the effect of freestream turbulence on the aerodynamic characteristics of wind turbines.
66 citations
TL;DR: In this article, the aerodynamic moment is derived and empirically modelled as a generalized Duffing-van-der-Pol nonlinearity, which indicates a dynamically unstable equilibrium point, i.e. negative aerodynamic damping.
65 citations
TL;DR: In this paper, the authors investigated the aerodynamic and performance of a scale OF-VAWT in pitch motion using the computational fluid dynamics (CFD) method with the turbulence model of improved delayed detached eddy simulation (IDDES) and the overset mesh technique.
65 citations
TL;DR: In this article, the aerodynamics of the Stardust Sample Return Capsule were analyzed in the low-density, transitional flow regime using free-molecular, Direct Simulation Monte Carlo, Navier-Stokes, and Newtonian methods to provide inputs for constructing a transitional flow bridging relation.
Abstract: The aerodynamics of the Stardust Sample Return Capsule are analyzed in the low-density, transitional flow regime using free-molecular, Direct Simulation Monte Carlo, Navier-Stokes, and Newtonian methods to provide inputs for constructing a transitional flow bridging relation. The accuracy of this bridging relation in reconstructing the aerodynamic coefficients given by the more exact methods is presented for a range of flight conditions and vehicle attitudes. There is good agreement between the various prediction methods, and a simple sine-squared bridging relation is shown to provide a reasonably good description of the axial force, normal force, and pitching moment over a range of Knudsen numbers from 0.001 to 10. The predictions show a static instability of the Stardust capsule in the free-molecular regime that persists well into the transitional flow. The addition of a thin disk to the base of the capsule is shown to remove this static instability. However, the extremely high entry velocity of 12.6 km/s for the proposed trajectory introduces difficult design issues for incorporating this disk caused by the high aerothermal loads that occur even under relatively rarefied conditions.
65 citations
01 Jan 1930
TL;DR: In this article, the aerodynamic damping moment of an oscillating aerofoil was calculated using a transformation of the fundamental hydrodynamical equations on lines differing from those followed by Dr. Wagner.
Abstract: In an interesting paper1, published early in 1925 in the Zeitschrift fur angewandte Mathematik und Mechanik, Dr. H. Wagner has developed a method of calculating the lift and pitching moment of an aerofoil in accelerated motion. Dr. Wagner’s paper is confined mainly to linear motion at a constant angle of incidence, but towards the end of the paper the analysis is extended to include the effects of an angular velocity also. Towards the end of last year I became interested in the problem of an oscillating aerofoil and wished to calculate the aerodynamic damping moment experienced by the aerofoil, since certain wind tunnel experiments had suggested that this damping moment increased with the frequency of the oscillation. If the amplitude of the oscillation is small, Dr. Wagner’s equations may by applied directly to the problem of the oscillating aerofoil, and the following paper is a brief account of my calculations, full details of which are contained in two reports2 of the R. and M. Series. In passing I may mention that I derived the expressions for the force and moment on the aerofoil by suitable transformations of the fundamental hydrodynamical equations on lines differing from those followed by Dr. Wagner, and so obtained an independent check on his equations.
64 citations