SYSTEM FOR REGISTERING CRACKS IN THE BLADES OF A GAS TURBINE ENGINE USING AN IONIZING SUBSTANCE IN NON-STATIONARY CONDITIONS

The study is devoted to the problem of detecting cracks in the blades of gas turbine engines using a damage registration system in non-stationary conditions. The principle of operation of the system is based on the manifestation of the ionizing properties of the active substance in the system of shell capsules at high temperatures. The study examines the physico-chemical processes that occur with the active substance in the capsule when it is heated to operating temperatures. A mathematical dependence is proposed to determine the mass of the active substance to be placed in a thin-walled capsule so that the system can detect cracks of a certain width. The obtained ratio allows us to take into account the gas parameters in the turbine stage at the location of the blade, the strength characteristics of the thin-walled capsule material and the thickness of the capsule shell. An estimate of the minimum width of the detected crack is presented under certain technological constraints. According to the results of the study, with an increase in the limiting stress of the capsule shell material, the required destructive pressure in the capsule increases, which leads to an increase in the degree of filling of the capsules with an ionizing substance.