US2491610A

US2491610A - Jet directive device

Info

Publication number: US2491610A
Application number: US649718A
Authority: US
Inventors: Esther C Goddard
Original assignee: DANIEL AND FLORENCE GUGGENHEIM
Current assignee: DANIEL AND FLORENCE GUGGENHEIM; DANIEL AND FLORENCE GUGGENHEIM FOUNDATION
Priority date: 1946-02-23
Filing date: 1946-02-23
Publication date: 1949-12-20
Anticipated expiration: 1966-12-20

Description

Dec. 20, .1949 R H, GODDARD 2,491,610

JET DIRECTIVE DEVICE Filed Feb. 23, 1946 Puentes Dec. zo, 1949 JET DIRECTIVE DEVICE This invention relates diverting portions of a j et Robert H. Goddard, Md., by Esther C. ass., assigner of one Florence Guggenheim N. Y., a corporation of Application February z3, 194 s, serial No.

deceased, Goddard,

-half to The Daniel and Foundation, New York, New York late of Annapolis, executrix, Paxton,

4 Claims. (Cl. 6035.6)

to devices for angularly and for striating the Jet to increase the entraining capacity thereof. The

invention is particularly adapted for use in connection with air-entraining augmenter tubes in rocket propulsion apparatus. In such apparatus as used in jet propulsion, a small compact jet of combustion gases moving at very high speed has very low propulsive efficiency but this low efficiency may be greatly increased by entraining with the combustion gases a substantial quantity of air. The resulting mixture of gas and air has greatly increased mass and correspondingly decreased speed and is for propulsion purposes.

found much more emcient It is the general object of the invention to increase the entraining effectiveness of such jets by the provisionV of further object adapted for use improved directive devices. A is to provide directive devices iin an augmenter where the jetproducing apparatus is disposed at a substantial angle to the axis of the augmenter tube.

The invention further relates to arrangements and combinations of parts which will be herein! after described and more particularly pointed out in the appended Preferred forms of the invention are shown in the drawing, in

claims.

which Fig. l is a sectional side elevation of a portion of an augmenter tube, with the improved directive devices lassociated therewith;

Fig. 2 is a longitudinal sectional view of the directive devices,

partly in perspective;

Fig. 3 is a transverse sectional view, taken along the line 3-3 in Fig. l; and Fig. 4 is a sectional view similar to Fig. i imi-I showing a modified construction.

Referring to the drawing, an augmenter tube llis shown, through which a flow of air is induced by combustion gases developed in a combustion chamber Il through a nozzle nozzle N opens at a substantial The improved rality of deiiectors C and delivered into the tube N. It will be noted that the into the side of the tube l and angle to the axis of the tube.

directive devices comprise a plu- 2t mounted in the nozzle N andextending lengthwise thereof. The devices Il are curved longitudinally as shown in Fig. 2 and are also somewhat sharply curved transverselyas shown in all of the devices side of said' no Each device 2l Fig. 3. It will be noted that 2l are concave toward the long zzle as shown in the drawings. is mounted on a supporting web 22 extending outward to the more closely adjacent the nozzle N is curved longitudinally, and the deectors 40 are somewhat more sharply curved longitudinally than is the case With the straight conical construction of the nozzle N as shown in Figs. 1 and 2.

In both cases, the distribution oi the deiiectors 2li or 40 is preferably as shown in Fig. 3, and this distribution is well adapted to produce a substantially uniform distribution of the combustion gases over the cross sectional area of the augmenter tube.

By the 'provision of such. directive devices, the combustion gases are gradually displaced into alignment with the axis of the augmenter 'tube and this displacement occurs without shock or substantial change in velocity, thusconserving the ventraining power of the jet.

Having thus described the invention and the advantages thereof, it will be understood that the invention is not to be limited to the details herein disclosed, otherwise than as set forth in the claims, but that what is claimed is:

1. In a jet directive device an augmenter tube, a combustion chamber, a conical discharge nozzle for said chamber mounted in one side wall of said tube and having its axis substantially inclined to the axis of said tube, and a plurality of jet deflectors mounted in said nozzle and extending longitudinally thereof, all of said deflectors being curved longitudinally and in the same direction with respect to the axis of said nozzle and being effective to deflect the combustion gases Vaway from said axis and all in the same direction, and all of said deflectors being curved transversely and presenting deflecting surfaces which are concave toward that side of the nozzle toward which the gases are deflected.

2. In a jet directive device. an augmenter tube, a combustion chamber,l a conical discharge nozzle for said chamber mounted in one side Wall of liiecting surfaces which said tube and having its axis substantially inclined to the axis of said tube, and a plurality of Jet detlectors mounted in said nozzle and extending longitudinally thereof, all of said deiiectors being curved longitudinally and in the same direction with respect to the axis of said nozzle and being effective to deilect the combustion gases away from the axis of said nozzle and all in the same direction, all of said deectors being curved transversely and presenting deare concave toward that side of the nozzle toward which the gases are deflected, and each deflector having a web by which it is supported on the nozzle wall but in spaced relation thereto.

3. In a jet directive device, an augmenter tube, a combustion chamber, a discharge nozzle mounted in one side wall of said augmenter tube and substantially inclined relative to the axis thereof, and a pluralityA of defiectors mounted in said nozzle, said deectors being arched longitudlnaily toward the short side of the nozzle and being curved transversely to present deilecting surfaces which are concave toward the long side of the nozzle, and said deflectors being effective to divert combustion gases from the axis of said nozzle toward the axis of said augmenter tube.

4. In a jet directive device, an augmenter tube. a combustion chamber, a discharge nozzle mounted at one side wall of said'augmenter tube and substantially inclined relative to the axis thereof, and a. plurality of defiectors mounted in said nozzle, said deilectors being arched longitudinally toward the short side of the nozzle and being curved transversely to present deilecting surfaces which are concave toward the long side of the nozzle, said deflectors being effective to divert combustion gases from the axis of said nozzle toward the axis oi' said augmenter tube, and said deflectors being relatively spaced and positioned to distribute the combustion gas substantially uniformly over the cross sectional area of the augmenter tube.

ESTHER C. GODDARD, Emecutria: of the Last Will and Testament of Robert H. Goddard, Deceased.

REFERENCES CITED UNITED STATES PATENTS Name Date Birkigt May 9. 1944 Number