Fragmenting nozzle system

Patent metadata

Field	Value
Publication number	US-10598129-B2
Application number	US-201615227091-A
Country	US
Kind code	B2
Filing date	Aug 3, 2016
Priority date	May 5, 2014
Publication date	Mar 24, 2020
Grant date	Mar 24, 2020

Abstract

A fragmenting nozzle system includes a first nozzle at least partially disposed within a second nozzle. The first nozzle includes an ablative shell, a syntactic foam support disposed between the ablative shell and the second nozzle, and an ignition system disposed at least partially within the syntactic foam support. For example, the ignition system is operable to generate a controlled-energy deflagration pressure wave that fragments the first nozzle but not the second nozzle.

First claim

What is claimed is:

1. A fragmenting nozzle system comprising:
a first nozzle at least partially disposed within a second nozzle,
the first nozzle including an ablative shell, a syntactic foam support disposed between the ablative shell and the second nozzle, and an ignition system disposed at least partially within the syntactic foam support.

2. The system as recited in claim 1 , wherein the syntactic foam support comprises benzoxazine.

3. The system as recited in claim 1 , wherein the syntactic foam support includes benzoxazine resin and an ether.

4. The system as recited in claim 3 , wherein the ether is selected from the group consisting of butyl glycidyl ether, cresyl glycidyl ether, neopentyl glycol diglycidyl ether, 1,4-butanediol diglycidyl ether, castor oil polyglycidyl ether, and combinations thereof.

5. The system as recited in claim 3 , wherein the syntactic foam support includes fumed silica.

6. The system as recited in claim 3 , wherein the syntactic foam support includes amorphous silica powder.

7. The system as recited in claim 3 , wherein the syntactic foam support includes microspheres.

8. The system as recited in claim 7 , wherein the microspheres are glass microspheres.

9. The system as recited in claim 7 , wherein the microspheres are ceramic microspheres.

10. The system as recited in claim 7 , wherein the syntactic foam support includes, by weight, 10%-40% of the microspheres.

11. The system as recited in claim 2 , wherein the syntactic foam support includes, by weight, up to 15% silica.

12. The system as recited in claim 11 , wherein the silica is selected from the group consisting of fumed silica, amorphous silica powder, silica glass fibers, and combinations thereof.

13. A fragmenting nozzle system comprising:
inner and outer convergent-divergent nozzles, the inner convergent-divergent nozzle lining an interior of the outer convergent-divergent nozzle and defining an initial nozzle throat geometry; and
an ignition system operable to trigger a controlled-energy deflagration pressure wave across the inner and outer convergent-divergent nozzles,
the inner convergent-divergent nozzle being formed of a fragmenting material with respect to the deflagration pressure wave and the outer convergent-divergent nozzle being formed of a fragment-resistant material with respect to the deflagration pressure wave such that upon triggering of the deflagration pressure wave, the inner convergent-divergent nozzle fragments and exposes a secondary, different nozzle throat geometry of the outer convergent-divergent nozzle.

14. The system as recited in claim 13 , wherein the inner convergent-divergent nozzle includes a shell and a foam support, the shell includes cyanate ester and the foam support includes benzoxazine.

15. The system as recited in claim 14 , wherein the foam support includes benzoxazine resin and an ether.

16. The system as recited in claim 15 , wherein the ether is selected from the group consisting of butyl glycidyl ether, cresyl glycidyl ether, neopentyl glycol diglycidyl ether, 1,4-butanediol diglycidyl ether, castor oil polyglycidyl ether, and combinations thereof.

17. The system as recited in claim 14 , wherein the foam support includes silica selected from the group consisting of fumed silica, amorphous silica powder, silica glass fibers, and combinations thereof.

18. The system as recited in claim 14 , wherein the foam support includes microspheres.

19. The system as recited in claim 14 , wherein the shell is a non-foam.

20. A fragmenting nozzle system comprising:
inner and outer convergent-divergent nozzles, the inner convergent-divergent nozzle lining an interior of the outer convergent-divergent nozzle and defining an initial nozzle throat geometry; and
an ignition system operable to trigger a controlled-energy detonation pressure wave across the inner and outer convergent-divergent nozzles,
the inner convergent-divergent nozzle being formed of a fragmenting material with respect to the detonation pressure wave and the outer convergent-divergent nozzle being formed of a fragment-resistant material with respect to the detonation pressure wave such that upon triggering of the detonation pressure wave, the inner convergent-divergent nozzle fragments and exposes a secondary, different nozzle throat geometry of the outer convergent-divergent nozzle.

Assignees

• Aerojet Rocketdyne Inc

Inventors

• Mcpherson Sr Douglass

Classifications

• F05D2300/2102

  Glass · CPC title

• F02K9/95

  characterised by starting or ignition means or arrangements (safety devices F02K9/38) · CPC title

• F02K9/974 Primary

  Nozzle- linings; Ablative coatings · CPC title

• F05D2300/612

  Foam · CPC title

• F05D2300/211

  Silica · CPC title