Hi
Engine rotor is the part that moves (rotates) in an Turbine engine. It consist in the Compressor (to the right in the img below) and the turbine in a one axle.
And again:
1. something external (air starter) makes the whole axle (compressor + turbine) rotate.
2. When axle is rotated, compressor start to compress intake air.
3. When the air has enough pressure it is mixed with fuel, ignited by spark plugs. Air + fuel ignited, (called gas from now on) had adquiered extra energy from combustion.
4 High energy gas impact the turbine and gas energy is transformed in a mechanical movement: gas turns the turbine. With turbine, whole axle is turned including compressor, who compress more aire and (go to 2.
)
http://nihrecord.nih.gov/newsletters...ter-balanc.jpg