Nozzle assembly for rocket and ramjet applications
View Patent ↗A nozzle assembly for thrust or thrust vector control of a rocket or ramjet, comprising an elongated nozzle housing and a pair of vane members mounted for pivotal movement within a central portion of the nozzle housing. The vane members extend vertically or transversely between the upper and lower portions of the nozzle housing near the forward portion thereof, and extend longitudinally in the nozzle housing from the forward end portion thereof to a point near the rear end portion thereof. The vane members are pivotable about axes disposed between the forward and rear ends thereof, and are movable between an open position wherein they are in substantially parallel relation and a closed position wherein their forward ends are in engagement with each other and their rear ends are in engagement with the adjacent inner surface of the nozzle housing. An operating mechanism is operatively connected to the vane members to move them simultaneously or individually between the open and closed positions for thrust control or thrust vector control.
1. A nozzle assembly for thrust or thrust vector control of a rocket or ramjet, comprising:
an elongated nozzle housing having a forward end portion and a rear end portion spaced longitudinally from said forward end portion;
a pair of vane members mounted on said nozzle housing for pivotal movement within the central portion of said nozzle housing, said vane members extending vertically or transversely between the upper and lower portions of said nozzle housing near said forward end portion thereof, said vane members extending longitudinally in said nozzle housing from said forward end portion thereof to a point near said rear end portion thereof;
said vane members being pivotable about axes disposed between the forward and rear ends thereof, and being movable between an open position wherein they are in substantially parallel relation so that gases can flow between them and also between said vane members and said nozzle housing, and a closed position wherein their forward ends are in engagement with each other and their rear ends are in engagement with the adjacent inner surface of said nozzle housing; and
an operating mechanism operatively connected to said vane members to move them simultaneously or individually between said open and closed positions for thrust control or thrust vector control.
2. The nozzle assembly of claim 1 wherein said nozzle housing is cylindrical with a curved inner surface, the forward end of each vane member is straight, and the rear end of each vane member is curved in a manner to engage in a uniform manner the adjacent curved inner surface of said nozzle housing when in said closed position.
3. The nozzle assembly of claim 1 wherein each of said vane members has a streamlined shape with a narrow forward end that tapers outwardly to a wider midportion and tapers inwardly to a narrow rear end so as to minimize the obstruction to gas flow through said nozzle housing when said vane members are in said open position.
4. The nozzle assembly of claim 1 wherein each of said vane members is connected to a pivot pin located at one of said axes, said pivot pin being operatively connected to said operating mechanism.
5. The nozzle assembly of claim 4 wherein said nozzle housing comprises substantially fiat platforms on said upper and lower inner portions thereof, said pivot pins being rotatably connected to said platforms.
6. The nozzle assembly of claim 1 wherein said operating mechanism is disposed on the outer surface of said nozzle housing.
7. The nozzle assembly of claim 6 wherein said operating mechanism comprises a mechanical actuator, an electromechanical actuator, a hydraulic actuator, or a squib actuated mechanism.
8. The nozzle assembly of claim 1 wherein said nozzle housing and said vane members are formed of a high temperature-resistant material.
9. The nozzle assembly of claim 1 wherein said axes are located nearer said forward end portion of said nozzle housing than said rear end portion thereof.
10. The nozzle assembly of claim 1 wherein the pivotal movement of said vane members can effect throat area changes in said nozzle housing of approximately 20 to 1.