| CPC F02K 1/08 (2013.01) [F02K 1/18 (2013.01); F02K 1/805 (2013.01); F05D 2220/323 (2013.01); F05D 2240/1281 (2013.01)] | 20 Claims |
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1. A variable area nozzle assembly for an aircraft propulsion system, the variable area nozzle assembly comprising:
a fixed center plug disposed along an axis, the fixed center plug includes a plug body and a seal, and the seal extends circumferentially about the plug body;
a fixed outer nozzle extending circumferentially about the axis and the fixed center plug, the fixed outer nozzle includes a distal end; and
an inner nozzle extending circumferentially about the axis and the fixed center plug, the inner nozzle is disposed radially between the fixed center plug and the fixed outer nozzle, the inner nozzle includes an inner nozzle body, the inner nozzle body forms a primary duct for a primary gas stream radially between the inner nozzle and the fixed outer nozzle, the primary duct includes an exit plane at the distal end, the inner nozzle body forms a secondary duct and a gap, the gap is a nozzle outlet of the secondary duct, the secondary duct is disposed radially between the inner nozzle body and the fixed center plug upstream of the seal, the gap is disposed radially between the inner nozzle body and the fixed center plug downstream of the seal, the inner nozzle body forms a plurality of apertures, and the inner nozzle body is axially translatable between and to a first axial position and a second axial position relative to the axis,
in the first axial position, the primary duct has a first cross-sectional area at the exit plane and the plurality of apertures are isolated from the gap by the seal, and
in the second axial position, the primary duct has a second cross-sectional area at the exit plane, the second cross-sectional area is less than the first cross-sectional area, and the plurality of apertures are connected in fluid communication with the gap to direct a secondary gas stream from the secondary duct and into the gap.
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