free power turbine

free power turbine

free power turbine
An arrangement in which a turbine, or stage of turbines, in a gas turbine engine does not drive the compressor. Free turbines are used to drive the reduction gears for the propeller in a turboprop engine or the transmission and rotor of a helicopter. Also known as a power turbine or a free turbine. In a turbine engine, a turbine wheel drives the output shaft and is not connected to the shaft driving the compressor.
References in periodicals archive ?
According to GE, the LMS100-PB is the largest aeroderivative gas turbine available with a free power turbine, ideally positioning it for large LNG applications.
The aerodynamically coupled free power turbine provides speed, flexibility and high torque for typical LNG compressor loads especially during start sequencing with pressurized conditions in the refrigeration loop, avoiding the need for starter/helper motors.
Engineers from EGT increased the compressor and high-pressure stages, and added a free power turbine to their proven Tempest gas turbine to create a train shaft engine with a simple-cycle efficiency exceeding 35 percent.