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 PDFInfo
- 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
- Authority
- 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
Links
- 210000003462 vein Anatomy 0.000 claims description 6
- 239000003351 stiffener Substances 0.000 claims 1
- 230000000694 effects Effects 0.000 abstract 1
- 230000002787 reinforcement Effects 0.000 abstract 1
- 230000015556 catabolic process Effects 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
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
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Aviation & Aerospace Engineering (AREA)
- Structures Of Non-Positive Displacement Pumps (AREA)
Abstract
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)
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 |
Family
ID=9240608
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
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)
Country | Link |
---|---|
FR (1) | FR2479771A1 (en) |
Cited By (2)
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)
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 |
-
1980
- 1980-04-03 FR FR8007805A patent/FR2479771A1/en active Pending
Patent Citations (5)
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)
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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