Free gas turbine with constant temperature-corrected gas generator speed

摘要

A method of controlling a speed of a gas turbine engine including a gas generator spool and a power turbine spool rotating independently from one another, including controlling a rotational speed of the gas generator spool according to a fixed relationship with respect to an outside air temperature throughout a variation of output power.

主权项

1. A method of controlling a speed of a gas turbine engine, the gas turbine engine including a high pressure spool and a low pressure spool rotating independently from one another, the method comprising:
determining a temperature-corrected rotational speed of the high pressure spool based on an actual rotational speed of the high pressure spool and on an air temperature measured outside of the gas turbine engine; controlling the rotation of the high pressure spool to maintain the temperature-corrected rotational speed of the high pressure spool at least substantially constant throughout a range of a power demand on the gas turbine engine by modulating an angle of variable inlet guide vanes throughout the range of the power demand, the variable inlet guide vanes being located upstream of a compressor having at least one rotor rotating with the high pressure spool; and controlling a rotational speed of the low pressure spool independently of the rotation of the high pressure spool.