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7331752 |
Method of conversion of continuous medium flow energy and device for conversion of continuous medium flow energy
A device and method for conversion of the energy of medium flows are provided. The proposed device and method ensure suppression of the vortex streams in the flow on the leg of its motion along the...
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7255309 |
Vernier active flow control effector
Methods and apparatus for controlling the attitude of a mobile platform with a resolution suitable for vernier attitude control. In a preferred embodiment, a method includes flowing fluid through...
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7143983 |
Passive jet spoiler for yaw control of an aircraft
A wing for an aircraft has a passive jet spoiler for providing yaw control by increasing drag on the wing. The spoiler comprises an inlet located near the leading edge of a lower surface of the...
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7048230 |
Laminar flow nacelle for an aircraft engine
A laminar flow nacelle for an aircraft engine ( 10 ) has an outer member ( 26 ) defining an aerodynamic shape. The nacelle ( 24 ) has an inner member ( 28 ) defining a chamber ( 30 ) with the outer...
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6899302 |
Method and device for altering the separation characteristics of flow over an aerodynamic surface via hybrid intermittent blowing and suction
An active flow control device and method for improving the aerodynamic efficiency of airfoils. The device and method pertain to the application of hybrid intermittent suction or intake of...
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6821090 |
Gust alleviation/flutter suppression device
An active control device is disclosed comprising an array of actively controlled oscillating air jets disposed on an aircraft structure. In a preferred embodiment, the device senses parameters...
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6796533 |
Method and apparatus for boundary layer reattachment using piezoelectric synthetic jet actuators
A method and apparatus for active boundary layer control on an aerodynamic surface. One or more piezoelectric synthetic jet actuators operate as a boundary layer pump to ingest fluid along the...
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6752358 |
Laminar flow control system and suction panel for use therewith
A laminar flow control system for incorporation in, for example, an aircraft flying surface includes a suction panel comprising a perforated skin ( 20, 40 ) mounted on a base member ( 60 ), a...
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6668638 |
Active vortex control with moveable jet
In a method of controlling vortex breakdown on an aerodynamic surface, a vortex generated by the aerodynamic surface is continually monitored to identify a non-linear region where vortex breakdown...
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6644598 |
Modification of fluid flow about bodies and surfaces through virtual aero-shaping of airfoils with synthetic jet actuators
The present invention involves a system for altering the aerodynamic shape and/or fluid flow about a solid body. The preferred embodiment comprises an obstruction disposed on the solid body and...
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6612524 |
Forebody vortex alleviation device
A forebody 10 for an aeronautical vehicle 12 is provided. The forebody 10 includes an exterior wall 14 having a first half 16 and a second half 18 . The first half 16 has a first...
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6543719 |
Oscillating air jets for implementing blade variable twist, enhancing engine and blade efficiency, and reducing drag, vibration, download and ir signature
A porous surface on an aircraft structure driven with oscillating positive and negative pressures is used as an active control device for attenuating negative aerodynamic interactions. The porous...
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6412732 |
Apparatus and method for enhancement of aerodynamic performance by using pulse excitation control
One aspect of the apparatus disclosed herein is a system for modifying an aerodynamic property of an aerodynamic surface in a fluid flow. The fluid flow could comprise a free stream fluid flow, or...
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6390418 |
Tangentially directed acoustic jet controlling boundary layer
The nozzle of an acoustic jet directs high momentum flux gas particles essentially tangentially into the boundary layer of the flow in a diffuser, an engine air inlet, a jet engine gas flow path or...
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6302360 |
Vortex generation for control of the air flow along the surface of an airfoil
Apparatus for generating vortices to control the flow of air across a airfoil of an aircraft includes a series of pressure active regions arranged along the leading edge of the airfoil. The...
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6267331 |
Airfoil with dynamic stall control by oscillatory forcing
A method for inhibiting dynamic stall of an airfoil by causing a fluid to flow out of at least one location on the airfoil. This location may be anywhere on the airfoil; but if the location is...
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6234751 |
Oscillating air jets for reducing HSI noise
Porous surfaces on an aerodynamic structure driven with positive and negative pressures are used in an active control system for attenuating shock waves responsible for high-speed impulsive (HSI)...
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6216982 |
Suction device for boundary layer control in an aircraft
A system for achieving a boundary layer control by sucking at least a portion of the boundary layer air flow through perforated or porous suction areas on the outer skin of the wings or other areas...
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6176454 |
Apparatus for influencing the flow separation from a body immersed in the flow
An apparatus serves for influencing the separation of a flow 2 from a body 1 immersed in the flow. The apparatus excites a shear layer 11 of the flow 2 at the immersed body 1 by periodic blowing...
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6135395 |
Aircraft wing leading edge high lift device with suction
An aircraft wing, wing assembly and method of reducing drag are provided. The wing asembly includes a main wing portion (10) and a leading edge high lift portion (12). The high lift portion is...
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6119987 |
Method and apparatus for controlling the boundary or wall layer of a continuous medium
The present invention relates to the field of aerohydrodynamics and heat and mass transfer and especially relates to a method and an apparatus for controlling the boundary layer or the wall layer...
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6094907 |
Jet engine and method for reducing jet engine noise by reducing nacelle boundary layer thickness
A jet engine has a noise reduction system which reduces the boundary layer located on the outer surface of the nacelle. The noise reduction system includes a plurality of openings located in the...
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6079671 |
Passive porosity airfoil management device
A passive porosity management device and process for an airfoil which provides a mechanism and method for controlling and modifying the lift, drag and flow field characteristics on an airfoil...
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6068328 |
Vehicular boundary layer control system and method
A vehicular boundary layer control system utilizing a series of external perforation arrays and suction sources controlled by a digital signal processor or microprocessor. Each array of...
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5971327 |
Mesoflap passive transpiration system and method for shock/boundary layer interaction control
A passive transpiration system for controlling interaction between turbulent boundary layer air and an impinging shock during supersonic airflow by application of a panel including passively...
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5957413 |
Modifications of fluid flow about bodies and surfaces with synthetic jet actuators
The present invention involves a system for altering the aerodynamic shape and/or fluid flow field about a solid body. The preferred embodiment comprises a synthetic jet actuator embedded in a...
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5884873 |
Suction generator system in an aircraft for maintaining a laminar boundary flow
Boundary layer air on the skin structure of an aircraft is sucked off through suction holes in the aircraft skin structure by a least one ejector pump. The ejector pump is operated by at least one...
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5806808 |
Airfoil lift management device
A passive porosity airfoil lift management device employed on a leading edge region of said airfoil whereby the lift on said airfoil may be varied and controlled by passively transferring air...
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5803410 |
Skin friction reduction by micro-blowing technique
A system and method for reducing skin friction of an object in relative motion to a fluid. A skin forming a boundary between the object and the fluid, the skin having holes through which...
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5798465 |
Method for actively damping global flow oscillations in separated unstable flows and an apparatus for performing the method
The method for damping global flow oscillations (20a.x, 20b.x) in a flowing medium in the region of an unstable flow (10) separating itself from at least one boundary surface (11, 12) is comprised...
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5772156 |
Aircraft boundary layer control system with discharge transpiration panel
An improvement to boundary layer control system, including a transpiration panel (58) for transpiring suction air in a distributed manner, is provided. The transpiration panel (58) replaces the...
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5743493 |
Boundary layer control in aerodynamic low drag structures
An aerodynamic low drag structure (12) has a skin (18, 19, 20) which in movement of the structure (12) relative to a surrounding gaseous fluid medium produces at a flow control region of the skin...
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5687934 |
V/STOL aircraft and method
Aircraft apparatus and method capable of V/STOL (vertical, short takeoff and landing) in addition to conventional flight. For V/STOL operation, induced lift is provided by blowing air over the...
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5618363 |
Method of manufacturing a porous material
A porous material is manufactured by weaving polycarbonate fibres through a tow of carbon fibres which has been pre-impregnated with an epoxy resin. A second layer of pre-impregnated carbon fibres...
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5591511 |
Superplastically formed structure having a perforated skin
A perforated sheet is diffusion bonded to a thin solid sheet. Each of the perforations of the perforated sheet is tapered, having a maximum diameter at the surface that is not bonded to the thin...
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5531406 |
Flow-vectored trailing-edge for airfoils and jets
Apparatus and method for airflow vectoring control for an airfoil, a two dimensional jet, and the like. An airfoil or jet with a blunt open edge and a suction system for sucking air into the open...
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5417391 |
Method for control of the boundary layer on the aerodynamic surface of an aircraft, and the aircraft provided with the boundary layer control system
A method and apparatus for boundary layer control by sucking air off the vortex chambers established in the trailing-edge portion of an aircraft aerodynamic surface. The rate of air bleed is...
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5409182 |
Flight vehicle
A flight vehicle includes a base frame in which an accumulating tank is mounted for receiving air. An air entrance device is mounted on the first end of the base frame for introducing air to enter...
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5348256 |
Supersonic aircraft and method
A supersonic aircraft having highly swept subsonic leading edge portions of the wings provided with boundary layer control suction slots. When the airplane is operating at high angles of attack...
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5335885 |
Aircraft wing having a super critical profile and a venting device for reducing compression shock
An aircraft wing having a super critical profile is equipped with a venting device extending in the direction of the span width along the upper side of the wing. The ventilating device includes a...
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5297765 |
Turbine engine nacelle laminar flow control arrangement
A laminar flow control arrangement for use in a nacelle for an aircraft turbine engine. The nacelle has a microporous outer skin in the area where air flow over the skin is to be maintained in...
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5236155 |
Method of reducing drag in aerodynamic systems
In the present method boundary layer thickening is combined with laminar flow control to reduce drag. An aerodynamic body is accelerated enabling a ram turbine on the body to receive air at...
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5016837 |
Venturi enhanced airfoil
A basic airfoil has its operating performance improved by incorporating one or more apertures in the airfoil adjacent its trailing edge. These apertures extend from the upper surface of the airfoil...
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4993663 |
Hybrid laminar flow nacelle
A hybrid laminar flow nacelle for housing an engine of an aircraft includes an outer annular cowl having a leading lip and radially spaced and axially extending annular outer and inner forward...
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4989810 |
Method and apparatus for influencing a laminar turbulent boundary layer transition on bodies in flow
A method and an apparatus for influencing a laminar-turbulent boundary layer transition on bodies in flow is indicated. The disturbances are in this case introduced into the boundary layer in an...
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4932612 |
Method and apparatus for reducing turbulent skin friction
A method and apparatus for reducing the skin friction on objects in relative motion to a field of fluid. The areas of relative low speed motion are fixed to align with a series of ridges on the...
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4771967 |
Rotor aircraft
A rotorcraft is provided with laterally placed dual rotors which rotate in opposite directions with the axis through the center of the rotors being transverse to the longitudinal axis of the...
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4709879 |
Controlled air-flow aircraft capable of vertical flight
By controlling the flow of the air over an airfoil, a lifting force can be achieved even in the absence of forward motion by the aircraft. The air flowing over the airfoil is forced into a chamber...
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4693201 |
Low drag surface construction
A low drag surface construction utilizes a plurality of longitudinally extending, parallel, spaced apart linear vortices extending transversely of the free stream to reduce drag between the free...
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4664345 |
Method for stabilizing laminar separated boundary layers
Separated laminar flow boundary layers are stabilized by delaying a transition into a turbulent flow and by reducing the size of the laminar boundary layer separation zone downstream of a...
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