TESTING METHOD OF THE AERO ENGINE WHEN CHECKING FOR THE ABSENCE OF SELF-OSCILLATIONS OF THE WORKING BLADES OF A LOW PRESSURE COMPRESSOR Russian patent published in 2018 - IPC G01M15/14 

FIELD: engines and pumps; test technology.

SUBSTANCE: invention relates to testing of aero engines, in particular to tests for check for the absence of self-oscillations of the working blades of a low pressure compressor. Before the test, a device is installed in the second engine circuit, which obstructs the air flow and increases the load level of the first stage of the low pressure compressor. At the same time, the engine test is carried out in a non-afterburner with control of the nozzle exhaust plane area based on the constancy of the ratio of the air pressure behind the high-pressure compressor to the turbine discharge pressure, corresponding to the afterburner of the engine, i.e. R*₂/R*₄=π*_t= const.

EFFECT: increase in the reliability of the results of the engine tests on the non-afterburner for the absence of self-oscillations of the working blades of the low pressure compressor is achieved.

1 cl, 2 dwg