METHOD FOR PROTECTING A GAS TURBINE ENGINE FROM OVERHEATING AT STARTUP Russian patent published in 2023 - IPC F02C9/28 

FIELD: gas turbine engines.

SUBSTANCE: invention relates to the field of control of gas turbine engines, in particular, to methods for protecting gas turbine engines from overheating at startup. The method for protecting the turbine of a gas turbine engine from overheating at startup consists in measuring the temperature of gases downstream of the turbine of a gas turbine engine T_T using open-junction thermocouples and closed-junction thermocouples, forming a limit value for the temperature of gases downstream of the turbine at startup T_T^{UNIT start}, comparison of gas temperature T_T, measured using open junction thermocouples, with the limit value T_T^{UNIT start}, short-term interruption of fuel supply G_T to the combustion chamber of the engine at start-up when T_T, measured using open junction thermocouples, is exceeding T_T^{UNIT start}, switching on the ignition unit for a predetermined time, resumption of reduced fuel supply G_T to the combustion chamber after the gas temperature T_T, measured using an open-junction thermocouple block, is lower than the limit value T_T^{UNIT start}, wherein for each type of gas turbine engine the difference A between the values of temperature gases T_T at start-up, measured using open-junction thermocouples and closed-junction thermocouples is additionally determined in advance, further in the process of starting a gas turbine engine the serviceability of open-junction thermocouples is determined, in case of failure of open-junction thermocouples, measurement of gas temperature at start-up is performed using thermocouples with a closed junction, wherein the limit value of the gas temperature at the start T_T^{UNIT start} is reduced by the value A, equal to 50…150 °C, and stopping of the fuel supply G_T to the combustion chamber of the engine is carried out for the time of T_T measured using thermocouples with a closed junction at start-up exceeding the value of T_T^{UNIT start} - A.

EFFECT: protecting gas turbine engines from overheating at startup.

2 cl, 1 dwg