Power plants – Reaction motor – Air passage bypasses combustion chamber
Patent
1996-09-17
1998-06-30
Freay, Charles G.
Power plants
Reaction motor
Air passage bypasses combustion chamber
602261, 23926537, F02K 310
Patent
active
057716811
ABSTRACT:
A fluid mixing apparatus for mixing primary exhaust and secondary airflow in a turbofan engine with provision for changing the ratio of secondary airflow to primary exhaust cross-sectional areas in the mixing plane. The mixing apparatus includes a segmented annulus (50) attached to the aft end of an engine generator casing (24), the annulus having a plurality of segments of which at least a portion are movable segments (52) hingedly connected to the generator. Each movable segment has an inboard position (54) in which the cross-sectional area ratio is increased and an outboard position (56) in which the ratio is decreased. A number of mixing devices (62) are connected to the segments. A repositioning assembly (96) moves the movable segments between their inboard and outboard positions. A first preferred embodiment of the mixing apparatus includes a number of stationary segments (60) interspersed between the movable segments (52). The mixing devices (62) are attached to the stationary segments (60). A second preferred embodiment of the mixing apparatus includes only movable segments (52), with the mixing devices (62) being attached to the movable segments. Expansion mechanisms (96) are provided between adjacent movable segments, as needed.
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Freay Charles G.
The Boeing Company
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