| 摘要 |
669,989. Jet propulsion plant. SOC. NATIONALE D'ETUDE ET DE CONSTRUCTION DE MOTEURS D'AVIATION. July 19, 1948. [July 21, 1947] No. 19293/48. Class 110(iii). [Also in Group XXXIII] A jet propulsion unit, arranged inside an aircraft wing with its air inlet near the leading edge and its propulsion nozzle near the trailing edge, has an ejector, arranged between the combustion chamber and propulsion nozzle, which sucks air from a compartment arranged around it in the wing which compartment is in turn connected to slots or apertures on the surface of the wing. A propulsive duct formed by an intake diffuser 41, a combustion chamber 43 and a propulsion nozzle 49 is mounted inside an aircraft wing O. A two-stage ejector 46, 48, arranged be tween the combustion chamber and propulsion nozzle, sucks air from compartments 45, 47 which are connected to suction slots 51, 52 provided on the upper surface of the wing. The nozzle 44 feeding the ejector 46, 48 and the propulsion nozzle 49 are flattened. It is stated that the suction of the ejector may be adjusted by varying the area of the passages through which the air enters the ejector. The Specification as open to inspection under Sect. 91, comprises also the use of the exhaust gases of a gas turbine jet propulsion engine to suck air out of two compartments connected by conduits to points on the surface of the aircraft. In this arrangement, Fig. 2 (Cancelled) the exhaust gases from the turbine 5 pass through a nozzle 6 formed as a two-stage aspirator sucking air out of two compartments 8 and 10 connected through conduits 28, 30 to the surfaces from which the boundary layer is to be removed. The aspirator has sliding sleeves 7 and 9 which allow the amount of boundary layer air sucked off to be controlled. Hollow arms 24 allow air to pass over the surface of the movable part 12 of the variable area nozzle to keep it cool and passages 23, 22, 26 and 27 allow the boundary layer on the part 12 to be removed. This subject-matter does not appear in the Specification as accepted.
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