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1. (WO2014200402) VARIABLE-GEOMETRY CONVERGENT-DIVERGENT EXHAUST NOZZLE FOR A JET ENGINE AND METHOD FOR VARYING THE NOZZLE

Pub. No.:    WO/2014/200402    International Application No.:    PCT/SE2013/050696
Publication Date: Fri Dec 19 00:59:59 CET 2014 International Filing Date: Sat Jun 15 01:59:59 CEST 2013
IPC: F02K 1/12
Applicants: SAAB AB
Inventors: RÄF, Martin
Title: VARIABLE-GEOMETRY CONVERGENT-DIVERGENT EXHAUST NOZZLE FOR A JET ENGINE AND METHOD FOR VARYING THE NOZZLE
Abstract:
The present invention relates to a variable convergent-divergent exhaust nozzle (14) for a jet engine (1) comprising a fixed structure (16), a first cross sectional area (Al), a second cross sectional area (A2), a plurality of first flap means (18) being pivotally connectable to the fixed structure (16), a plurality of second flap means (18') being pivotally connected to the plurality of first flap means (18), first actuator means (20, 20h, 24) being arranged to actuate said first flap means (18) for variation of the nozzles (14) first cross sectional area (Al) between a first position and a second position, and second actuator means (20', 20 'h, 24') being arranged to actuate said second flap means (18') for variation of the nozzles (14) second cross sectional area (A2) between a first position and a second position. The respective first flap means (18, 24, 26) comprises third flap means (24) and fourth flap means (26), each comprising a first sliding surface (22, 22') arranged in continuous contact with adjacent first flap means (18) during said variation. The respective second flap means (18') comprises fifth flap means (24') and sixth flap means (26'), each comprising a second sliding surface (22''', 22''''') arranged in continuous contact with adjacent second flap means (18') during said variation. The present invention also relates to method for varying a variable convergent-divergent exhaust nozzle (14) for a jet engine (1).