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Publication numberUS2944386 A
Publication typeGrant
Publication dateJul 12, 1960
Filing dateJun 25, 1957
Priority dateJun 25, 1956
Also published asDE1049712B
Publication numberUS 2944386 A, US 2944386A, US-A-2944386, US2944386 A, US2944386A
InventorsSchmitt Henri Francois, Bertin Jean Henri
Original AssigneeBertin & Cie
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Device for increasing the impulsion of a fluid, especially applicable as a lift or propulsion device
US 2944386 A
Abstract  available in
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Claims  available in
Description  (OCR text may contain errors)

July 12, 1960 J.- H. BERTIN ETAL 2,944,386

DEVICE FOR INCREASING THE IMPULSION OF A FLUID, ESPECIALLY APPLICABLE AS A LIFT OR PROPULSION DEVICE Filed June 25, 1957 INVENTORS a -Mu M JM 1B1 Mafia-x), 8:4,, M v d/afiar ATTORNEYS DEVICE FOR INCREASING THE IMPULSION A V FLUID, ESPECIALLY APPLICABLE AS A LIFI OR PROPULSION DEVICE Jean Henri Bel-tin, Neuilly sur-Seine, and Henri Francois Schmitt, Bourg la-Reine, France, assignors to Societe Bertin & Cie, Paris, France, a French company i Filed June 25, 1957, Ser. No. 667,831 7 Claims priority, application France June 25, 1956 1 Claim. (Cl. 60-355) In their patent application No. 624,811 of Nov. 28, 1956, now Patent No. 2,922,277, the applicants have described a device for increasing the impulsion of a flow of fluid which is especially applicable as a lift or propulsion device for aircraft.

Thisapparatus is characterised by the combination of a convergent tubular member which brings the fluid up to speed and a divergent portion serving to reduce the convergent 1 is induced by the action of the fluid screen discharged from the slot 3. The divergent tube 5 is intended to channel the flow induced through the convergent 1 and the screenissuing from the slot 3, when this screen, after a certain active trajectory through the air, indicated by the arrows F and F, has lost the greater part of its energy and therefore of its eifectiveness. I The tube 5 then acts to relay this fluid screen in its action and improves the pressure coupling between the induced i jet and the atmosphere. In addition, this regularisation of. the induced flow is accompanied by an increase in the quantity of this flow'which acts concurrently-m increase the thrust produced. The tube 5 must be coupled to the fluid screen and in view of the large divergence of this screen (half-angle at the apex of,30, for example), its diameter at'the neck must be clearly greater than that of the, neck 2 of the convergent '1 (by, 'to 50%, for' 1 example).

speed, the said portion being formed by a fluid screen produced by the discharge of a fluid under pressure through a nozzle in the form of a suitably orientatedslotarranged on the solid convergent tubular member.

The present invention has for its object improvements made to this device, in particular with a'view to rendering its use more convenient, more practical and more efiective. r

In accordance withthe invention, a solid divergent is provided at a certain distance from the convergent so as. i

v of a' jet, said nozzle extending along the periphery of to envelop and sustain the divergent fluid screen which,

at that distance, has lost a great part of its energy and in consequence of its eflectiveness, this divergent having an intake section suitably adapted to thatoflthe fluid 7 screen and greater than the neck of the convergent from which it is separated by a space in which the fluidrscreen acts alone. a

In the accompanying drawings:

Fig. 1 shows in axial cross-section an impulsionincreasing device combined with a solid divergent.

Fig. 2 relates to an improvement in the lift device applicable to the casein which the divergent fluid screen is formed'by a liquid.

In Fig. 1, there is seen at 1 the convergent of the lift device terminating at the neck 2 or very slightly on the certain distance by a tubular divergent member '5, which 5 is usually fairly short, and which is coupled to the convergent 1 by arms 6 and 6'. I This tube 5 may comprise a small convergent 7.

from as a divergent jet, and a pump which sucks the liquid collected in said vannular chamber and discharges downstream side of this neck, at 3 the nozzle in the It will be assumed in this example that the flow in the. i

Fig. 2"shows a lift device of this type, in which the fluid divergent is formed by a liquid passed into the collector 4. A ring 39.disposed coaxially with the convergent 1 and provided with an annular slot 40 recovers the liquid used for the fluid screen. v A pump'41' driven by a motor 42 brings back this liquid, under pressure, into the collector 4.

What is claimed is:

Jet augmenter comprising a convergent duct bounded by a physical wall and ending with an orifice open tothe atmosphere, a pressure chamber integral with said wall and extending outside said duct in the vicinity of said orifice, means for supplying pressure liquid to said chamber, a slot-like nozzle communicating with said chamber'and adapted to dischargesaid liquid in the form said orifice and facing in a direction diverging slightly 1 from the axis of said duct whereby the jet issuingv from, said nozzle forms a divergent liquid wall extending the convergent physical wall of the duct and bathed by the atmosphere, a divergent duct bounded by a physical wall and substantially coaxial with the convergent duct, said divergent duct extending at a distance downstream of the convergent duct and around the path of the divergent .jet, an annular chamber formed on said divergent duct and having an annular: inlet. facing towards said slot-like,

nozzle in order to collect part ofthe liquid issuing thereit into said pressure chamber.

References Cited in the file of this patent Germany July 4, 1910

Patent Citations
Cited PatentFiling datePublication dateApplicantTitle
US284962 *May 7, 1883Sep 11, 1883 William huston
US1415406 *Jun 1, 1917May 9, 1922British Westinghouse ElectricElastic-fluid-operated ejector
US2000762 *Oct 26, 1933May 7, 1935Gen ElectricFluid jet pump
US2379436 *May 20, 1942Jul 3, 1945Distillation Products IncMethod and apparatus for producing vacuums
DE223896C * Title not available
Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US3230702 *Jul 27, 1964Jan 25, 1966Bertin & CieJet diffuser usable as a propeller shroud
US4272499 *Nov 28, 1979Jun 9, 1981Lone Star Steel CompanyProcess and apparatus for the removal of particulate matter and reactive or water soluble gases from carrier gases
WO1983003777A1 *Apr 22, 1983Nov 10, 1983Western Electric Company, Inc.Vapor-phase axial deposition system
U.S. Classification261/36.1, 261/116, 261/118
International ClassificationF02K1/36, H03F1/54, B64C23/00, F02K1/28
Cooperative ClassificationB64C2700/6274, F02K1/36, F02K1/28, B64C23/005, H03F1/54
European ClassificationB64C23/00A, F02K1/28, H03F1/54, F02K1/36