| 摘要 |
1,194,716. Jet propulsion nozzles. UNITED AIRCRAFT CORP. May 31, 1967 [June 1, 1966], No. 25197/67. Heading F1J. A supersonic or hypersonic jet propulsion nozzle comprises a base member mounted within the nozzle housing and having a base surface at its downstream end for receiving upstream thrust presuure, so that the flow of fluid around the base member and base surface creates a region of lowpressure downstream of the base surface, and an additional member (a "sting") extending downstream from the base surface into a high-pressure region downstream of the low-pressure region includes means for diverting a portion of the stream of fluid from the nozzle to the low-pressure region to increase the upstream thrust pressure acting on the base member. In Fig. 3, the base member, which may be in the form of a central plug 84, carries a sting 88 extending downstream of the base surface 86. Fluid from a high-pressure region downstream of a shock wave 95 enters the interior 90 of the sting through inlets 92 and leaves it through outlets 94 at a lower-pressure region upstream of the shock wave, where it acts to increase the thrust pressure acting on the base surface 86. In addition, the downstream end surface of the sting 88, being within the highpressure region, is subjected to a high thrust pressure. The sting may be axially movable automatically to adjust the position of the inlets 92 in accordance with variations in the position of the high-pressure region. An annular flange (100), Fig. 4 (not shown), may be provided at the downstream end of the sting 88 to deflect the fluid into the inlets 92. In a further embodiment, fluid from the inlet of the engine or from a region downstream of the turbine or a separate fluid from a pressurized tank or the like is passed through the interior of the sting to outlets at the downstream end of the sting, where it is injected (at supersonic speed, if desired) into a shock region to deflect a portion of the jet flow into an upstream direction to increase the thrust pressure on the base surface. The engine may be of turbojet, ramjet or socket type. Reference has been directed by the Comptroller to Specification 1,072,082. |
