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    • 116. 发明专利
    • GAS TURBINE ENGINE POWER PLANTS FOR AIRCRAFT
    • GB1506588A
    • 1978-04-05
    • GB4175175
    • 1975-10-11
    • ROLLS ROYCE
    • B64D33/00F02K1/64B64C15/04B64C21/00F02K1/20B64C21/04
    • 1506588 Aircraft thrust reversers ROLLS ROYCE Ltd 5 Oct 1976 [11 Oct 1975] 41751/75 Heading F2R [Also in Division B7] In a gas-turbine-engine thrust reverser fan air is directed over the outer surface of the engine cowl 30 by the Coanda effect, and the location at which this forwardly moving air impinges against the relatively rearwardly moving ambient air is controlled to avoid reingestion. As the aircraft speed decreases the stagnation area 34 of high pressure moves forwardly until a sensor 36 detects its presence. The sensor includes valves (not shown) which are spring-biased closed, and the detected high pressure is sufficient to overcome the springs and open the valves to permit compressed air from the compressor 38 to escape radially from the cowl via a conduit and pressure adjuster 42. In an alternative embodiment, Fig. 3, the sensor comprises two pitot tubes 44, 46 which receive ambient air flow and reversed air flow, respectively, and are connected to a fluidic device 50. A double-headed piston 52 is operated by the fluidic device to control a butterfly valve 56 located in a conduit 54 which feeds compressed air to a Coanda-effect producing nozzle 22a. The fluidic devices of two similar engines may be connected (Fig. 4, not shown) to obviate asymmetric thrust reversal in the event of one of the engine thrust reversers malfunctioning.