Patent
Vortex generators on rotor blades to delay an onset of large oscillatory pitching moments and increase maximum lift
TLDR
In this article, an airborne mobile platform (10) generally includes a plurality of rotating rotor blades operating in an airflow that forms a boundary layer on each of the rotor blades, and at least one of these rotor blades includes a section that encounters the airflow that includes an unsteady subsonic airflow having at least a varying angle of attack.Abstract:
An airborne mobile platform (10) generally includes a plurality of rotating rotor blades (12) operating in an airflow that forms a boundary layer on each of the rotor blades. At least one of the rotor blades includes a section that encounters the airflow that includes an unsteady subsonic airflow having at least a varying angle of attack. At least one of the rotor blades also includes one or more vortex generators (30) on the at least one of the rotor blades that generate a vortex that interacts with the boundary layer to at least delay an.onset of separation of the boundary layer, to increase a value of an unsteady maximum lift coefficient and to reduce a value of an unsteady pitching moment coefficient for the section.read more
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Patent
Energy efficiency improvements for turbomachinery
Peter Ireland,Anthony Ireland +1 more
TL;DR: In this article, a method and apparatus that allow Conformal Vortex Generator art to improve energy efficiency and control capabilities at many points in a turbomachine or device processing aero/hydrodynamic Newtonian fluid-flows is described.
Patent
Blade for a rotor of a wind turbine provided with barrier generating means
Peter Fuglsang,Bove Stefano +1 more
TL;DR: In this article, a wind turbine blade is divided into a root region (30) with a substantially circular profile closest to the hub, an airfoil region (34), with a lift generating profile furthest away from the hub and a transition region (32) between the root region and the air foil region.
Proceedings ArticleDOI
Passive Control of Compressible Dynamic Stall
Preston B. Martin,Jacob Wilson,Aeroflightdynamics Directorate,John D. Berry,Tin-Chee Wong,Marty Moulton,Redstone Arsenal,Michael A. McVeigh +7 more
TL;DR: In this article, a rotorcraft-type airfoil was retrofitted with a leading edge glove and tested with and without integral molded vortex generators, and the combined use of a transonic leading edge gloves and vortex generators led to the alleviation of dynamic stall pitching moments; the two concepts worked together to alleviate the severe pitching moments during stall, even though neither one was successful when used independently.
Patent
Method for determining optimum vortex generator placement for maximum efficiency on a retrofitted wind turbine generator of unknown aerodynamic design
TL;DR: In this article, a method of optimizing performance of a wind turbine electric generator (WTG) comprises the steps of measuring the performance of the WTG, defining an area on a blade of the turbine, placing stall flags within said defined area, monitoring the behavior of the stall flags when the turbine is operating, determining a stall line based upon the stall flag during operation, installing vortex generators on the blade adjacent to and upwind of said stall line, and monitoring the behaviour of the said stall flags during operation with vortex generators installed on all blades.
Patent
Application of elastomeric vortex generators
TL;DR: In this article, a method of improving aerodynamic performance of foils by the application of conformal, elastomeric vortex generators is proposed, which allows for the use of various forms of vortex generators to sections that have been problematic from engineering and cost considerations.
References
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Patent
Method and apparatus for delaying the separation of flow from a solid surface
TL;DR: In this paper, an active perturbation-producing element on the solid surface is driven to induce oscillations in the boundary layer of the fluid stream about an axis substantially perpendicular to the solid surfaces, to enhance the mixing of boundary layer in fluid stream.
Patent
Active blowing system for rotorcraft vortex interaction noise reduction
TL;DR: In this article, an active control of a rotorcraft blade is proposed, which alleviates the aerodynamics of blade vortex interactions (BVI) and thus the impulsive BVI noise levels and signature.
Patent
Deployable flow control device
TL;DR: In this paper, a deployable flow control device for a flow surface over which fluid having a fluid boundary layer flows which fluid boundary layers exhibits certain dynamics is disclosed, and the deployable device comprises a flow effector which is movably attached to a housing which is attachable, either initially or retrofitably, to a flow surfaces.
Patent
Modification of fluid flow about bodies and surfaces through virtual aero-shaping of airfoils with synthetic jet actuators
Ari Glezer,Michael Amitay +1 more
TL;DR: In this paper, the authors present a system for altering the aerodynamic shape and/or fluid flow about a solid body, which involves an obstruction disposed on the solid body and extending outwardly from the object into the fluid flowing over the object and a synthetic jet actuator embedded in the object.
Patent
Flow control device and method of controlling flow
Frederick J. Lisy,Mohammed Modarreszadah,Mehul P. Patel,Jack DiCocco,Reed Carver,Robert Schmidt,Troy S. Prince +6 more
TL;DR: In this article, a reactive modular flow control device with deployable flow effectors is described, where the authors present a method of controlling air flow across a surface of an aircraft under certain flight conditions comprising the steps of sensing fluid separation from the surface by measuring the pressure on the surface, determining a standard deviation of the pressure measurements over a period of time, and deploying a flow of effector in response to the standard deviation.