Nozzle throat disc for thrust vectoring

Fluid sprinkling – spraying – and diffusing – Reaction motor discharge nozzle – With means controlling amount – shape or direction of...

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244 52, 60230, B64C 1502

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050925245

ABSTRACT:
Tapered disc rotatably mounted in the exhaust duct of a propulsion system. The disc can be rotated about an axis normal to the yaw plane. A disc bump projects from both the upper and lower surfaces of the disc, and extends diametrically across it. When fluid is flowing through the exhaust duct, the bump, together with the opposing surfaces of the exhaust duct, chokes the flow and causes a sonic plane to be formed at the bump. The supersonic flow downstream of the disc bump remains approximately normal to the bump for angles of rotation of up to 20.degree. from normality between the bump and the upstream flow. Rotation of the disc thus causes deflection or turning of the fluid flow. The resultant thrust vectoring enables the yaw of the propulsion system and, therefore, a vehicle containing the propulsion system, to be controlled.

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patent: 4641782 (1987-02-01), Woodward
SAE Journal, "Jet Deflection Devices . . . ", Jan. 1958, pp. 64-65.

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