US20010020666A1 - Airfoil with dynamic stall control by oscillatory forcing - Google Patents

Airfoil with dynamic stall control by oscillatory forcing Download PDF

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Publication number
US20010020666A1
US20010020666A1 US9227198A US2001020666A1 US 20010020666 A1 US20010020666 A1 US 20010020666A1 US 9227198 A US9227198 A US 9227198A US 2001020666 A1 US2001020666 A1 US 2001020666A1
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Prior art keywords
airfoil
dynamic stall
stall control
location
oscillatory forcing
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Israel Wygnanski
David Greenblatt
Avi Seifert
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B64—AIRCRAFT; AVIATION; COSMONAUTICS
    • B64C—AEROPLANES; HELICOPTERS
    • B64C23/00—Influencing air flow over aircraft surfaces, not otherwise provided for
    • B64C23/04—Influencing air flow over aircraft surfaces, not otherwise provided for by generating shock waves
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B64—AIRCRAFT; AVIATION; COSMONAUTICS
    • B64C—AEROPLANES; HELICOPTERS
    • B64C21/00—Influencing air flow over aircraft surfaces by affecting boundary layer flow
    • B64C21/02—Influencing air flow over aircraft surfaces by affecting boundary layer flow by use of slot, ducts, porous areas or the like
    • B64C21/04—Influencing air flow over aircraft surfaces by affecting boundary layer flow by use of slot, ducts, porous areas or the like for blowing
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B64—AIRCRAFT; AVIATION; COSMONAUTICS
    • B64C—AEROPLANES; HELICOPTERS
    • B64C21/00—Influencing air flow over aircraft surfaces by affecting boundary layer flow
    • B64C21/02—Influencing air flow over aircraft surfaces by affecting boundary layer flow by use of slot, ducts, porous areas or the like
    • B64C21/08—Influencing air flow over aircraft surfaces by affecting boundary layer flow by use of slot, ducts, porous areas or the like adjustable
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B64—AIRCRAFT; AVIATION; COSMONAUTICS
    • B64C—AEROPLANES; HELICOPTERS
    • B64C27/00—Rotorcraft; Rotors peculiar thereto
    • B64C27/32—Rotors
    • B64C27/46—Blades
    • B64C27/467—Aerodynamic features
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B64—AIRCRAFT; AVIATION; COSMONAUTICS
    • B64C—AEROPLANES; HELICOPTERS
    • B64C2230/00—Boundary layer controls
    • B64C2230/02—Boundary layer controls by using acoustic waves generated by transducers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B64—AIRCRAFT; AVIATION; COSMONAUTICS
    • B64C—AEROPLANES; HELICOPTERS
    • B64C2230/00—Boundary layer controls
    • B64C2230/04—Boundary layer controls by actively generating fluid flow
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B64—AIRCRAFT; AVIATION; COSMONAUTICS
    • B64C—AEROPLANES; HELICOPTERS
    • B64C2230/00—Boundary layer controls
    • B64C2230/06—Boundary layer controls by explicitly adjusting fluid flow, e.g. by using valves, variable aperture or slot areas, variable pump action or variable fluid pressure
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T50/00—Aeronautics or air transport
    • Y02T50/10—Drag reduction

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  • Engineering & Computer Science (AREA)
  • Aviation & Aerospace Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Mechanical Engineering (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)

Abstract

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 within one-quarter of the airfoil chord from the leading edge and the fluid flow has non-zero net mass flux, then the fluid flow is modulated at a frequency described by a Strouhal ratio greater than one.
US09/092,271 1997-06-26 1998-06-05 Airfoil with dynamic stall control by oscillatory forcing Expired - Fee Related US6267331B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IL121164 1997-06-26
IL12116497A IL121164A (en) 1997-06-26 1997-06-26 Airfoil with dynamic stall control by oscillatory forcing

Publications (2)

Publication Number Publication Date
US6267331B1 US6267331B1 (en) 2001-07-31
US20010020666A1 true US20010020666A1 (en) 2001-09-13

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ID=11070307

Family Applications (1)

Application Number Title Priority Date Filing Date
US09/092,271 Expired - Fee Related US6267331B1 (en) 1997-06-26 1998-06-05 Airfoil with dynamic stall control by oscillatory forcing

Country Status (4)

Country Link
US (1) US6267331B1 (en)
EP (1) EP0887257A3 (en)
JP (1) JPH1159594A (en)
IL (1) IL121164A (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20060102801A1 (en) * 2004-11-01 2006-05-18 The Boeing Company High-lift distributed active flow control system and method
US20090001222A1 (en) * 2007-05-10 2009-01-01 California Institute Of Technology Control of aerodynamic forces by variable wetted surface morphology
US20100018322A1 (en) * 2008-05-07 2010-01-28 Airbus Deutschland Gmbh Switchable Vortex Generator and Array Formed Therewith, and Uses of the Same
DE102008061838A1 (en) * 2008-12-15 2010-06-17 Repower Systems Ag Rotor blade of a wind turbine with a turbulator

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US6109566A (en) * 1999-02-25 2000-08-29 United Technologies Corporation Vibration-driven acoustic jet controlling boundary layer separation
US6390418B1 (en) * 1999-02-25 2002-05-21 United Technologies Corporation Tangentially directed acoustic jet controlling boundary layer
CA2300714A1 (en) * 2000-03-10 2001-09-10 James C. Hayes Vertical wings on fluid vehicule with stabilizing torque system of jets to utilize fluid energy for forward motion, that is, sailing in fluid like air or water
FR2821605B1 (en) * 2001-03-01 2003-05-30 Eads Airbus Sa METHOD AND DEVICE FOR ACCELERATING THE DESTRUCTION OF AT LEAST TWO VORTEX IN THE WAKE OF A MOBILE, IN PARTICULAR AN AIRCRAFT
US6793177B2 (en) * 2002-11-04 2004-09-21 The Bonutti 2003 Trust-A Active drag and thrust modulation system and method
FR2853622B1 (en) * 2003-04-14 2005-05-27 Eurocopter France ROTARY SHUTTER AND ELEMENT SUSTENTATOR, IN PARTICULAR HELICOPTER BLADE, PROVIDED WITH SUCH A ROTARY SHUTTER
US8016244B2 (en) * 2004-02-20 2011-09-13 The Boeing Company Active systems and methods for controlling an airfoil vortex
US7354247B2 (en) * 2005-10-27 2008-04-08 General Electric Company Blade for a rotor of a wind energy turbine
US7748958B2 (en) * 2006-12-13 2010-07-06 The Boeing Company Vortex generators on rotor blades to delay an onset of large oscillatory pitching moments and increase maximum lift
US9541106B1 (en) * 2007-01-03 2017-01-10 Orbitel Research Inc. Plasma optimized aerostructures for efficient flow control
IS2635B (en) * 2007-11-20 2010-06-15 Hampidjan Hf Improved trawl closure
ITTO20070468A1 (en) * 2007-06-29 2008-12-30 Alenia Aeronautica Spa METHOD TO INCREASE THE PORTFOLIO OF AERODYNAMIC SURFACES AND TO REDUCE THE RESISTANCE TO ADVANCE
DK2182797T3 (en) * 2007-07-31 2017-07-10 Thyborøn Skibssmedie As High-efficiency trawl bucket with high stability
US20100194144A1 (en) * 2007-08-01 2010-08-05 Sinha Sumon K Deturbulator fuel economy enhancement for trucks
NL2000819C2 (en) * 2007-08-17 2009-02-18 Stichting Energie Wind turbine and rotor blade.
US8052388B2 (en) * 2007-11-29 2011-11-08 United Technologies Corporation Gas turbine engine systems involving mechanically alterable vane throat areas
WO2011077424A1 (en) 2009-12-21 2011-06-30 Ramot At Tel-Aviv University Ltd. Oscillatory vorticity generator and applications thereof
CN102884311B (en) 2010-02-16 2015-11-25 技术研究及发展基金有限公司 To the current control of vertical axis wind turbine (VAWT)
DE102010026162A1 (en) * 2010-07-06 2012-01-12 Airbus Operations Gmbh Aircraft with wings and a system for minimizing the influence of unsteady flow conditions
WO2013066690A1 (en) * 2011-11-02 2013-05-10 Murtech, Inc. Systems and methods for performance improvement of aerodynamic and hydrodynamic surfaces
KR101589596B1 (en) 2013-02-01 2016-02-12 가부시끼가이샤 도시바 Vortex generating apparatus and vortex generating method
US9464532B2 (en) * 2013-03-05 2016-10-11 Bell Helicopter Textron Inc. System and method for reducing rotor blade noise
JP6128568B2 (en) * 2015-03-26 2017-05-17 株式会社Ｓｕｂａｒｕ Aircraft intake structure
CN104760683B (en) * 2015-05-04 2016-04-27 厦门大学 Zero-net-mass-flux jet is utilized to reduce the method for wing drag due to shock wave
US20170323239A1 (en) 2016-05-06 2017-11-09 General Electric Company Constrained time computing control system to simulate and optimize aircraft operations with dynamic thermodynamic state and asset utilization attainment
CN112810800B (en) * 2021-01-27 2023-06-16 北京理工大学 Laminar flow separation control method based on local vibration of wing surface
CN112849389B (en) * 2021-01-27 2022-11-25 北京理工大学 Dynamic stall control method based on dynamic droop of wing leading edge
US11866156B1 (en) 2021-11-21 2024-01-09 Wei Liu Apparatus for vortex generation to improve aerodynamics
US11794887B1 (en) * 2022-04-06 2023-10-24 Lockheed Martin Corporation Removable trailing edge assembly and system for rotor blade trailing edge actuation
CN114763196B (en) * 2022-05-17 2024-06-07 吉林大学 Stall control method for small fixed wing aircraft based on nonlinear dimension reduction
CN114684353B (en) * 2022-06-02 2022-10-14 中国空气动力研究与发展中心低速空气动力研究所 Pulse jet actuator, wing and aircraft

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US3774867A (en) * 1972-06-27 1973-11-27 Us Air Force Acoustic wing stall delaying device
US4169567A (en) * 1974-12-13 1979-10-02 Tamura Raymond M Helicopter lifting and propelling apparatus
DE3320481A1 (en) 1983-06-07 1984-12-13 Deutsche Forschungs- und Versuchsanstalt für Luft- und Raumfahrt e.V., 5000 Köln Method and device for influencing the flow on aerodynamic profiles
GB2188397B (en) * 1984-09-13 1988-12-29 Rolls Royce A low drag surface construction
US4802642A (en) 1986-10-14 1989-02-07 The Boeing Company Control of laminar flow in fluids by means of acoustic energy
DE3738366A1 (en) * 1987-11-12 1989-05-24 Deutsche Forsch Luft Raumfahrt METHOD AND DEVICE FOR GENERATING A LAMINAR-TURBULENT BORDER LAYER TRANSITION IN A FLOWED BODY
US5209438A (en) * 1988-06-20 1993-05-11 Israel Wygnanski Method and apparatus for delaying the separation of flow from a solid surface
US5359663A (en) * 1993-09-02 1994-10-25 The United States Of America As Represented By The Secretary Of The Navy Method and system for suppressing noise induced in a fluid medium by a body moving therethrough
US5901928A (en) * 1996-06-14 1999-05-11 Aptek, Inc. Active turbulence control technique for drag reduction
US5938404A (en) * 1997-06-05 1999-08-17 Mcdonnell Douglas Helicopter Company Oscillating air jets on aerodynamic surfaces

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20060102801A1 (en) * 2004-11-01 2006-05-18 The Boeing Company High-lift distributed active flow control system and method
US20080173766A1 (en) * 2004-11-01 2008-07-24 The Boeing Company High lift distributed active flow control system and method
US20090001222A1 (en) * 2007-05-10 2009-01-01 California Institute Of Technology Control of aerodynamic forces by variable wetted surface morphology
US20120239231A1 (en) * 2007-05-10 2012-09-20 Mckeon Beverley J Control of aerodynamic forces by variable wetted surface morphology
US8276851B2 (en) * 2007-05-10 2012-10-02 California Institute Of Technology Control of aerodynamic forces by variable wetted surface morphology
US8424809B2 (en) * 2007-05-10 2013-04-23 California Institute Of Technology Control of aerodynamic forces by variable wetted surface morphology
US20100018322A1 (en) * 2008-05-07 2010-01-28 Airbus Deutschland Gmbh Switchable Vortex Generator and Array Formed Therewith, and Uses of the Same
US8616494B2 (en) * 2008-05-07 2013-12-31 Airbus Operations Gmbh Switchable vortex generator and array formed therewith, and uses of the same
US9650124B2 (en) 2008-05-07 2017-05-16 Airbus Deutschland Gmbh Switchable vortex generator and array formed therewith, and uses of the same
DE102008061838A1 (en) * 2008-12-15 2010-06-17 Repower Systems Ag Rotor blade of a wind turbine with a turbulator

Also Published As

Publication number Publication date
US6267331B1 (en) 2001-07-31
IL121164A0 (en) 1998-02-08
JPH1159594A (en) 1999-03-02
EP0887257A3 (en) 2000-01-19
EP0887257A2 (en) 1998-12-30
IL121164A (en) 2002-03-10

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