To compensate for a speed of a low spool, by arranging counter-rotating blade stages in a compressor instead of a stator stage.
A relatively low rotational speed of the spool of a gas turbine engine can be compensated by the counter-rotating blade stages 72, 74 and 76 instead of the stator stage. The low speed spool 60 has at least one compressor blade stage 78 and 80 and at least one turbine blade stage. A combustor is arranged between the compressor blade stage and the turbine blade stage along a core flowpath. At least one counter-rotating compressor blade stage 72, 74 and 76 is alternately juxtaposed with at least one compressor blade 78 and 80 of the low speed spool. A transmission 90 couples at least one additional compressor blade stage 72, 74 and 76 to the low speed spool 60 for counter-rotating around the engine axis.
COPYRIGHT: (C)2008,JPO&INPIT
SUCIU GABRIEL L
NIKKANEN JOHN P
Tomioka Kiyoshi