METHOD TO PROTECT GAS-TURBINE ENGINE FROM OVERHEATING Russian patent published in 2008 - IPC F02C9/28 

FIELD: aircraft industry; mechanical engineering; gas-turbine engine.

SUBSTANCE: invention relates to sphere of control of gas-turbine engines, particularly, to methods of protection of aircraft gas-turbine engines from overheating. Invention is aimed at increasing reliability of evaluation of thermal condition of exhaust gases after turbine and preventing repeated starting of engines by organizing process of renewal of fuel feed into combustion chamber after reduction of temperature of gases below tolerable value. In to proposed method of protection of gas-turbine engine from overheating as starting including metered delivery of fuel into combustion chamber acc. To preset program at flow rate G^thr, measuring of temperature G^thr of exhaust gases after turbine at starting by means of thermocouples with closed junction, forming of first maximum tolerable value of temperature T_t ^max of gases, comparing T_t ¹ with T_t ^1max and cutting off fuel delivery into combustion chamber at T_t ¹>T_t ^1max according to invention, at starting temperature T_t ² of exhaust gases after turbine is measured by thermocouples with open junction, second maximum tolerable value of gas temperature T_t ^2max at starting is formed, T_t ² is compared with T_t ^2max and at T_t ²≥T_t ^2max fuel delivery to combustion chamber is stopped, and at T_t ²<T_t ^2max fuel delivery into combustion chamber is renewed at flow rate G^thr1 reduced by 9-11% from G^thr, and igniting set is switched on for preset period of time to fire fuel-air mixture and then at completing stage of starting, delivery of fuel at reduced flow rate G^thr1 is cut off and metered delivery of fuel according to preset program with flow rate G^thr is continued.

EFFECT: improved reliability of protection of gas-turbine engine from overheating.

5 cl, 2 dwg