Gas turbine engine having counter rotating turbines and a controller for controlling the load driven by one of the turbines

A gas turbine engine, said gas turbine engine comprising:

• a compressor;
• a turbine having a turbine rotor disk, said turbine being mounted downstream said compressor;
• a compressor turbine being mounted downstream said turbine for producing power for driving said compressor, said compressor turbine having a compressor turbine rotor disk;
• said compressor turbine rotor disk being mechanically coupled to said compressor to transmit said power to said compressor;
• said turbine rotor disk rotating in a direction opposite to the direction of rotation of said compressor turbine rotor disk;
• a heat exchanger having a first circuit connected to said compressor turbine and a second circuit connected between said compressor and said turbine;
• a hydraulic load for taking off a fraction of said power produced by said compressor turbine, said hydraulic load comprising a hydraulic pump that is mechanically coupled to said compressor turbine;
• a means for controlling said hydraulic load, whereby said fraction of said power produced by said compressor turbine is controlled.