FR2479771A1 - Duct for increasing aircraft lift - uses venturi to suck air off tops of wings to reduce boundary layer - Google Patents

Duct for increasing aircraft lift - uses venturi to suck air off tops of wings to reduce boundary layer Download PDF

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Publication number
FR2479771A1
FR2479771A1 FR8007805A FR8007805A FR2479771A1 FR 2479771 A1 FR2479771 A1 FR 2479771A1 FR 8007805 A FR8007805 A FR 8007805A FR 8007805 A FR8007805 A FR 8007805A FR 2479771 A1 FR2479771 A1 FR 2479771A1
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FR
France
Prior art keywords
wings
aircraft
boundary layer
aerodynamic
tops
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
FR8007805A
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French (fr)
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Individual
Original Assignee
Individual
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Individual filed Critical Individual
Priority to FR8007805A priority Critical patent/FR2479771A1/en
Publication of FR2479771A1 publication Critical patent/FR2479771A1/en
Pending legal-status Critical Current

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Classifications

    • 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
    • B64C21/06—Influencing air flow over aircraft surfaces by affecting boundary layer flow by use of slot, ducts, porous areas or the like for sucking
    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B64—AIRCRAFT; AVIATION; COSMONAUTICS
    • B64C—AEROPLANES; HELICOPTERS
    • B64C2230/00—Boundary layer controls
    • B64C2230/20—Boundary layer controls by passively inducing fluid flow, e.g. by means of a pressure difference between both ends of a slot or duct
    • 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)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Aviation & Aerospace Engineering (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)

Abstract

The channel to increase aircraft lift uses the venturi effect created in one or more aerodynamic passages to suck the boundary layer of air from the top of the aircraft wings. The aerodynamic passage can be situated on any part of the aircraft facing into the headwind or one of its components and are connected to channels in the tops of the wings which act both as slots for sucking the air away and reinforcements for the wings.

Description

DESCRIPTION
Hypersustentateur d'appoint
Le présent dispositif intéresse toutes les voilures d'aéronefs qu'elles soient fixes, variables ou tournantes.DESCRIPTION
Booster lift
The present device concerns all aircraft wings, whether fixed, variable or rotary.

Dans les dispositifs connus de ce genre, l'aspiration de la couche limite est fournie par les groupes motopropulseurs de l'aéronef, mettant la portance à la merci d'une panne de ces derniers lors des phases critiques de décollage ou d'approche. In known devices of this kind, the suction of the boundary layer is provided by the aircraft powertrains, putting the lift at the mercy of a breakdown of the latter during the critical take-off or approach phases.

Proportionnel au vent relatif (A) et independant du système de propulsion ce système, en étant utilisable dans tout le domaine de vol, vise plus particulierement a un emport plus élevé de charge utile ou a un accroissement de l'autonomie de l'aéronef. Le gain en portance se situant entre 30 et 50 % selon les essais déi réalises pour ce type dthypersustentation, une seconde application serait l'utilisation en "tout ou rien" a la demande, du dispositif, pour obtenir un gain immédiat de portance sans changement notable de l'assiette. Proportional to the relative wind (A) and independent of the propulsion system, this system, being usable in the entire flight range, is more particularly aimed at carrying a higher payload or at increasing the autonomy of the aircraft. As the gain in lift is between 30 and 50% according to the tests carried out for this type of lift, a second application would be the use of "all or nothing" on demand, of the device, to obtain an immediate gain in lift without change. notable of the plate.

Utilisé sur voilures tournantes et dispose a l'extrémité de celle-ci, le gain de portance obtenu justifierait une diminution de diametre du rotor, autorisant ainsi une vitesse plus elevée a l'aéronef pour le profii de voilure considéré.Used on rotary wings and arranged at the end thereof, the gain in lift obtained would justify a reduction in diameter of the rotor, thus authorizing a higher speed for the aircraft for the wing profile considered.

Le dispositif objet de l'invention est constitue d'une veine aérodynamique (I) de type tube de Venturi dispose a l'intrados de voilure ou a son extrémité, dans laquelle débouchent les canalisations des prises de dépression (2) de ltextrados ; le tout jouant le rôle de pompe a vide pour les zones interessées.  The device which is the subject of the invention consists of an aerodynamic vein (I) of the Venturi tube type arranged on the lower surface of the airfoil or at its end, into which the pipes of the vacuum outlet ports (2) of the ltextrados open; all playing the role of vacuum pump for the areas concerned.

Une zone préférentielle d'aspiration (4) se situez la jonction du caisson principal de voilure et des volets, rendue étanche a l'intrados par un joint souple (5) dont l'attache est réalisée sur le caisson principal. Un autre type d'aspiration peut être réalisé à l'aide de profils creux (3) servant de lisses.A preferential suction zone (4) is located at the junction of the main wing box and the flaps, made watertight on the lower surface by a flexible seal (5) whose attachment is made to the main box. Another type of suction can be carried out using hollow profiles (3) serving as healds.

pour raidir l'extrados et débouchant directement dans la veine aerodynamique dans le cas de montage du dispositif en extrémité de voilure.for stiffening the upper surface and opening directly into the aerodynamic vein in the case of mounting the device at the end of the wing.

C dispositif peut être utilise conte apport: efficace de portance dans tout le domaine du vol d'aéronefs gros porteurs dans le but d'économie de carburant ou de charge utile plus élevée. Sur aéronefs légers et rapides, outre les avantages ci-dessus, la commande en "tout ou rien" de la veine aérodynamique autoriserait, par un gain du Cz, un gain immédiat d'altitude sans changement notable de l'assiette de l'aéronef. Sur voilures tournantes, tout en conservant le profil d'origine, le dispositif autoriserait une diminution du diamètre du rotor, permettant de reculer la limitation en vitesse de l'aéronef.  This device can be used as a contribution: effective lift in the whole area of large aircraft flight with the aim of saving fuel or higher payload. On light and fast aircraft, in addition to the above advantages, the "all or nothing" control of the aerodynamic stream would authorize, by gaining Cz, an immediate gain in altitude without significant change in the attitude of the aircraft . On rotary wings, while retaining the original profile, the device would allow a reduction in the diameter of the rotor, making it possible to reverse the speed limitation of the aircraft.

Claims (5)

REVENDICATIONS soumises au vent relatif ou à l'une de ses composantes. subject to relative wind or one of its components. ou plusieurs veines aérodynamiques, utilisant le principe du tube de Venturi, or several aerodynamic veins, using the principle of the Venturi tube, caractérisé par le fait que l'aspiration nécessaire est fournie par une characterized in that the necessary suction is provided by a à tous les aéronefs, to all aircraft, I. Hypersustentateur d'appoint par aspiration de couche limite applicableI. Applicable boundary layer aspiration lift 2. Dispositif selon la revendication i, 2. Device according to claim i, caractérisé par le fait que la ou les veines aérodynamiques peuvent être characterized by the fact that the aerodynamic vein (s) can be situées en tous points du corps de l'aéronef, de ses dispositifs stabilisa located at all points of the aircraft body, its stabilized devices teurs et/ou de sa voilure qu'elle soit fixe, variable ou tournante. teurs and / or its wing whether fixed, variable or rotating. 3. Dispositif selon la revendication I,3. Device according to claim I, caractérisé par le fait que la ou les veines aérodynamiques peuvent être characterized by the fact that the aerodynamic vein (s) can be équipées de dispositifs, fixes variables ou réglables tendant à faire varier fitted with devices, fixed variable or adjustable tending to vary la section de la veine aux endroits désirés aux fins d'optimisation de la the section of the vein in the desired locations for the purpose of optimizing the dépression et/ou de la traînée. depression and / or drag. 4. Dispositif selon la revendication 1, 4. Device according to claim 1, caractérisé par ltutilisation d'une ou de plusieurs canalisations faisant characterized by the use of one or more pipes making également office de fente d'aspiration et jouant le rôle de raidisseur also acts as a suction slot and acts as a stiffener d'extrados ; ce dispositif pouvant être employé seul. extrados; this device can be used alone. 5. Dispositif selon la revendication 1,5. Device according to claim 1, caractérisé par l'utilisation de la jonction caisson principal de voilure / characterized by the use of the main wing box junction / volets de courbure, ou volet j volet dans le cas de volets à plusieurs curvature flaps, or flap j flap in the case of flaps with several éléments successifs, comme fente d'aspiration ; la jonction d'intrados successive elements, such as a suction slot; the underside junction étant rendue étanche par un joint souple. Ce dispositif pouvant être being sealed by a flexible seal. This device can be employé seul ou avec le dispositif 4 ci-dessus.  used alone or with device 4 above.
FR8007805A 1980-04-03 1980-04-03 Duct for increasing aircraft lift - uses venturi to suck air off tops of wings to reduce boundary layer Pending FR2479771A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
FR8007805A FR2479771A1 (en) 1980-04-03 1980-04-03 Duct for increasing aircraft lift - uses venturi to suck air off tops of wings to reduce boundary layer

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR8007805A FR2479771A1 (en) 1980-04-03 1980-04-03 Duct for increasing aircraft lift - uses venturi to suck air off tops of wings to reduce boundary layer

Publications (1)

Publication Number Publication Date
FR2479771A1 true FR2479771A1 (en) 1981-10-09

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FR8007805A Pending FR2479771A1 (en) 1980-04-03 1980-04-03 Duct for increasing aircraft lift - uses venturi to suck air off tops of wings to reduce boundary layer

Country Status (1)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2850353A1 (en) * 2003-01-29 2004-07-30 Const Aeronautiques Du Nord Es Air flow turbulence modulator comprises duct through rear part of wing and suction unit beneath it to draw air flow from upper surface
FR2857650A1 (en) * 2003-07-19 2005-01-21 Rolls Royce Plc NACELLE OR LAMINAR FLOW SURFACE FOR AN AIRCRAFT ENGINE

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2075817A (en) * 1934-08-17 1937-04-06 Arthur W Loerke Wing vortex reducer
DE748432C (en) * 1939-12-29 1944-11-02 Extractor wing or tail unit
FR1228297A (en) * 1959-03-12 1960-08-29 Improvement in propellers and rotary wings
US3261576A (en) * 1962-06-14 1966-07-19 Olin Mathieson Aircraft structure
US4169567A (en) * 1974-12-13 1979-10-02 Tamura Raymond M Helicopter lifting and propelling apparatus

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2075817A (en) * 1934-08-17 1937-04-06 Arthur W Loerke Wing vortex reducer
DE748432C (en) * 1939-12-29 1944-11-02 Extractor wing or tail unit
FR1228297A (en) * 1959-03-12 1960-08-29 Improvement in propellers and rotary wings
US3261576A (en) * 1962-06-14 1966-07-19 Olin Mathieson Aircraft structure
US4169567A (en) * 1974-12-13 1979-10-02 Tamura Raymond M Helicopter lifting and propelling apparatus

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2850353A1 (en) * 2003-01-29 2004-07-30 Const Aeronautiques Du Nord Es Air flow turbulence modulator comprises duct through rear part of wing and suction unit beneath it to draw air flow from upper surface
FR2857650A1 (en) * 2003-07-19 2005-01-21 Rolls Royce Plc NACELLE OR LAMINAR FLOW SURFACE FOR AN AIRCRAFT ENGINE
GB2404234A (en) * 2003-07-19 2005-01-26 Rolls Royce Plc A laminar flow surface for an aircraft

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