초록

The ability of a gas turbine engine to recover from surge is enhanced by implementing a closed loop control mode wherein fuel flow is varied as a function of the ratio of the rate of change of engine gas generator speed to compressor discharge pressure.

대표청구항 ▼

In a method for exercising control over the rate of delivery of a combustible fuel to a gas turbine engine, the engine having a gas generator and being operable in substantially steady state and acceleration modes, the improvement comprising: providing an acceleration schedule which is a function of

In a method for exercising control over the rate of delivery of a combustible fuel to a gas turbine engine, the engine having a gas generator and being operable in substantially steady state and acceleration modes, the improvement comprising: providing an acceleration schedule which is a function of the ratio of the rate of change of engine gas generator speed to gas generator compressor discharge pressure; selecting data from said acceleration schedule in accordance with existing engine operating conditions; modifying the selected data in accordance with the actual instantaneous compressor discharge pressure to provide a demand signal which is a function of the rate of change of gas generator speed; comparing the demand signal with the actual rate of change of gas generator speed to provide an error signal; adjusting said error signal to provide a fuel flow rate change command; and employing said command to determine the rate of flow of fuel to the engine.