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Showing 1 to 14 of 14 for “"vortex wake"”.
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The structure of a trailing vortex wake
Experiments have been performed in the spiral wake that surrounds the vortex shed from the tip of a rectangular NACA 0012 half wing. Both single-point and simultaneous two-point hot-wire measurements were made ten chord lengths downstream of the wing at a Reynolds number of 320,000. The structure …
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Implicit Euler calculation of supersonic vortex wake/engine plume interaction
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Aeronautics and Astronautics, 1992.
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Helicopter Flight Dynamics Simulation with a Time-Accurate Free-Vortex Wake Model
… simulation model with a time-accurate free-vortex wake model capable of capturing the response to maneuvers of arbitrary amplitude. The resulting model has been used to analyze different flight conditions, including both steady and transient maneuvers. The flight dynamics model is based on a …
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Flowfield measurements in the vortex wake of a missile at high angle of attack in turbulence
… and intensity of the asymmetric vortices in the wake of the VLSAM model at a raised level of freestream turbulence; and to display the asymmetric vortices by velocity mapping and pressure contours. The purpose is to correlate the results with the force measurements of Rabang to provide a greater …
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Computational methods for non-planar vortex wake flow fields with applications to conventional and rotating wings
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Aeronautics and Astronautics, 1982.
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Untersuchung von 4-Wirbelsystemen zur Minimierung von Wirbelschleppen und ihre Realisierung an Transportflugzeugen
… approach for assessing the potential of 4-vortex wakes concerning an alleviation of the wake vortex hazard is presented. The first step of the numerical approach comprises the systematic investigation of 4-vortex topologies representing generic farfield vortex wakes. Once a configuration …
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Vortex-induced vibrations of a non-linearly supported rigid cylinder
Vortex-Induced Vibrations (VIV) are a complex fluid-structure interaction problem.<br/>VIV are particularly strong for low-mass structures subject to a low damping, as<br/>encountered in the offshore industry, in which structures experiencing VIV can also<br/>be subject to strong structural …
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Blade tonal noise reduction using tail articulation at high Reynolds number
… means of reducing tonal noise due to the stator wake blade interaction in underwater vehicles. This work is experimental in nature and conducted in the closed channel water tunnel at Naval Undersea Warfare Center in Newport, Rhode Island. Tail articulation is carried out with a life scale stator …
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Supermaneuverable perching
… were able to capture real images of the dominant vortex wake dynamics. We describe the application of these results to the synthesis of higher fidelity aerodynamic models. We also demonstrate our initial perching experiments with flapping wings, using a flapping-wing version of our glider as well …
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An improved panel method for the prediction of performance of ducted propellers
… of this method is the application of full wake alignment scheme in which the trailing vortex wake sheets of the blades are aligned with the local flow velocity by also considering the effects of duct and duct wake. A process of repaneling the duct is simultaneously introduced to improve the …
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Dual Solver Computational Modeling of Ship-Helicopter Dynamic Interface Aeromechanics
… aerodynamic interactions between the ship airwake and the helicopter aerodynamics, known as the dynamic interface (DI). As such, detailed analysis and testing must be done to establish the range of safe conditions at which these maneuvers can be performed, as well as to train pilots to perform …
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Turbulent flowfield downstream of a perpendicular airfoil--vortex interaction
… of an airfoil encountering an intense streamwise vortex. This type of perpendicular airfoil--vortex interaction commonly occurs in helicopter rotor flows. The experiments presented here thus provide useful information for the prediction of helicopter noise, particularly BWI noise. Three-component …
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The Near Wake of a European Starling
The wake of a freely flying European starling (Sturnus vulgaris) was measured using high speed, time-resolved, particle image velocimetry, simultaneously with high speed cameras which imaged the bird. These measurements have been used to generate vector maps in the near wake that can be associated …
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Dynamics of longitudinal wake vortices
In the present study, the mid-field vortex wake is investigated. For the most part, the results focus on the motion of a pair of co-rotating vortices prior to merger, both in and out of ground effect. However, in order to verify the experimental and computational methods, results for single …