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    • 5. 发明公开
    • Variable area nozzle for gas turbine engine
    • 燃气涡轮发动机的可变面积喷嘴
    • EP2584184A3
    • 2017-06-14
    • EP12185811.2
    • 2012-09-25
    • Rolls-Royce plc
    • Kennea, Robin CharlesHowarth, Nicholas
    • F02K1/09F02K1/80
    • F02K1/09F02K1/805F05D2240/55F05D2260/38F05D2260/57
    • A variable area nozzle (200) for a gas turbine engine is provided that has a circumferential outer boundary (100), which may be formed at least in part by the nacelle of a turbofan engine, that has a fixed portion (110) and a movable portion (120). The movable portion is movable by an actuator (160) both upstream and downstream from a datum position. This allows the exit area (NA) of the variable area nozzle to be adjusted according to flight conditions. When the movable portion is at or upstream of the datum position, there is no flow path between the fixed and movable portions. This enables the nozzle exit area to be optimized throughout flight, for example during changing cruise conditions, without inducing unwanted and inefficient flow structures between the fixed and movable portions and without allowing flow to leak out of the outer boundary of the nozzle.
    • 提供用于燃气涡轮发动机的可变面积喷嘴(200),其具有可至少部分地由涡轮风扇发动机的机舱形成的周向外边界(100),所述周边外边界具有固定部分(110)和 可动部分(120)。 可移动部分可通过致动器(160)在基准位置的上游和下游移动。 这可以根据飞行条件调整变面积喷嘴的出口面积(NA)。 当可移动部分位于基准位置或基准位置的上游时,固定部分和可移动部分之间不存在流动路径。 这使得喷嘴出口区域能够在整个飞行过程中例如在改变巡航条件期间被优化,而不会在固定部分和可移动部分之间引起不希望且低效的流动结构并且不允许流动从喷嘴的外边界泄漏。