METHOD FOR PROTECTING A GAS TURBINE ENGINE FROM PUMPING Russian patent published in 2021 - IPC F04D27/02 

FIELD: gas industry.

SUBSTANCE: invention relates to the field of gas turbine engine manufacturing and can be used in electronic-hydromechanical systems for automatic control of gas turbine engines (GTE). In all modes of GTE operation, the relative pressure change is compared with the first predetermined value determined for each type of GTE experimentally, and the relative speed is compared with the second predetermined value determined for each type of a GTE experimentally; when the signal "Surge" is generated, the fuel supply to the combustion chamber (CC) is stopped for a predetermined time, determined for each GTE experimentally in the process of acceptance tests. Additionally, in all modes of GTE operation from minimum to maximum, the rotor speed of a free turbine (FT), the temperature of the gases behind the turbine and the rotational speed of the rotor of the gas generator are measured, the rates of change of these parameters are calculated. When the start air bleed valve is closed, the rate of change of the gas temperature behind the turbine is compared with the first predetermined value, the rate of change of the gas generator rotor speed is compared with the second predetermined value, if the rate of change in the gas temperature behind the turbine is greater than the first predetermined value and the rate of change of the gas generator rotor speed is less than the second before a given value, and in the case of an open start air bleed valve, the rate of change in the rotational speed of the FT rotor is additionally compared with the third predetermined value, and if the rate of change in the temperature of the gases behind the turbine is greater than the first predetermined value, and the rate of change in the rotational speed of the gas generator rotor is less than the second predetermined value and the rate of change in the rotational speed of the FT rotor is less than the third predetermined value, then the signal "Parametric surge" is generated. If the “Surge” signal and the “Parametric surge” signal are generated at the same time, the “GTE emergency stop” signal is generated and the GTE emergency stop is performed. Therefore, when the signal "Emergency stop of the gas turbine engine" is generated, commands to open the air bleed valve of the compressor, the hydraulic safety valve, the start air bleed valve are given. Fuel consumption is reduced in the combustion chamber. After that in 0.1 s after the formation of the signal "Emergency stop of the GTE", a command is issued to open the first air bypass flap of the compressor, in 0.3 seconds after the signal is generated, a command is issued to open the second air bypass flap of the compressor. In 0.5 s after the signal is generated, a command is issued to close the stop valve.

EFFECT: invention preserves operability and resource of gas turbine engine and increases engine reliability in case of surge.

1 cl, 1 dwg