I can not answer for all turbines but as an engineer I would say that they would be rotating the same direction due to the bearing speeds.
If one shaft was turning 5,000rpm and the other 2,000rpm then the bearing would be at 3,000rpm if rotating the same direction and 7,000 if turning the opposite direction.
|Quoting Gigneil (Reply 6):|
If I'm not mistaken, the GEnx will also feature contra-rotation
|Quoting IFIXCF6 (Reply 7):|
Since stators (non-moving vanes between each set of rotating blades) are used to straighten the airflow,
|Quoting Jetlagged (Reply 10):|
This is one complication the RR three spool design can avoid.
|Quoting Air2gxs (Reply 2):|
All shafts travel in the same direction. Clock-wise for PW & GE, counter-clockwise for RR.
|Quoting B747FE (Reply 5):|
The Rolls Royce Trent 900 was designed with a contra-rotating HPC/HPT module.
|Quoting Caboclo (Reply 16):|
EMBQA, what's the difference between shafts and spools?
|Quoting Finkenwerder (Reply 9):|
Rolls Royce did it 30 years ago with the Pegasus ............Counter rotating shafts !!
|Quoting Lightsaber (Reply 18):|
Theoretically, you could optimize the airfoils so that no stator is needed, but no one has done it right yet.
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