Komsomolsk-na-Amure State University (Komsomolsk-na-Amure, Russia)

I. K. Andrianov, Cand. Eng., Associate Prof., Aircraft Engineering Dept., e-mail: ivan_andrianov_90@mail.ru
E. K. Chepurnova, Graduate Student, Aircraft Engineering Dept., e-mail: el.chep@bk.ru

This research is devoted to optimization of the detection system for damages of blades of a gas turbine engine in
non-stationary conditions. The system is based on the approach on the method, when capsules with active substance are placed in a steel blade body, then a capsule is bursting due to difference of pressures during the process of crack propagation; as a result, ejected active substance is registered. The problem of this research is connected with optimal distribution of capsules, which contain active substance, in a turbine blade body. The research technique was developed for a modeling problem, when a steel turbine blade with constant cross section, having tensile crack and subjected to the action of extension centrifugal force, was observed. Development of the model with optimal distribution of capsules was based on assessment of pre-critical crack growth: it was required to distribute the capsules along the median line of blade cross section in such way, that it would be possible to detect the crack of pre-critical growth. Analysis of ultimate state of a blade with crack was carried out on the base of stress intensity coefficient, which allows to take into account the feature of crack location and to determine its critical length when its accelerated growth takes place. Variation of the pressure inside a capsule, required for its bursting depending on opening of crack sides. The suggested model takes into account location of the capsule with active substance relating to crack opening sides. Calculation of minimal number of capsules in blade bode depending on pressure inside the capsule and rotating speed of blades was conducted on the example of the steel turbine blade R-5530 B. The obtained dependences allow us to find the optimal combination between the geometric and physical characteristics of the crack detection system and the minimal number of capsules. The application of the proposed approach to the optimal distribution of capsules along the median line of the blade cross section will increase the efficiency of use of the damage detection system in turbine blades in non-stationary conditions, thereby ensuring the safety of operation of gas turbine engines in aviation technology.

This scientific research was carried out at the expense of the grant of the RF scientific fund No. 22-79-10114 «Development of the system for diagnostics the damages of turbine blades and the method of heat removal optimization in the conditions of thermal fatigue» (https://rscf.ru/project/22-79-10114/).

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