MONITORING METHOD OF GAS TURBINE ENGINE TECHNICAL STATE DURING ITS OPERATION Russian patent published in 2019 - IPC G01M15/14 

FIELD: aviation.

SUBSTANCE: invention relates to operation of gas turbine engines (GTE), namely, to control of their technical state during operation for decision on their maintenance and further operation. GTE technical state monitoring method during its operation includes gas temperature measurement in flow downstream of low pressure turbine – T₄ thermocouples at least in eight points uniformly arranged along circumference in characteristic section at the beginning and during operation. Method comprises periodically calculating difference ΔT_4i between each two adjacent thermocouples, recording GTE operating time at time measurement τ, dependencies ΔT_4i=f(τ) are determined, wherein preset maximum tolerance deviation value ΔT_{4i prev.} from values determined from measurement at the beginning of operation, comparing ΔT_4i=f(τ) with ΔT_{4i prev.}, and by current values output of ΔT_4i beyond limit of tolerable deviations of ΔT_{4i prev.} technical condition of the engine is changed.

EFFECT: by variation of difference between thermocouples, measuring gas temperature in flow downstream of low pressure turbine – T₄, it is possible to draw conclusions on technical state of combustion chamber of gas turbine engine, as well as accurately determine the place, in which deterioration of technical condition occurs, due to which it is possible to prevent development of defect and to minimize costs for engine repair by making timely decision.

3 cl, 1 dwg, 2 tbl