Studying and designing improved coatings for labyrinth seals of gas­turbine engine turbines

Authors

DOI:

https://doi.org/10.15587/1729-4061.2018.140912

Keywords:

газотурбінний двигун, коефіцієнт корисної дії, радіальний зазор, лабіринтне ущільнення, легування, витрати газу

Abstract

An analysis of improving efficiency of aircraft engine turbines by means of improvement of composition of sealing coatings used in labyrinth seals was made. It was established that a number of contradictory requirements to properties of such coatings are imposed at the initial stage of engine running-in and during further operation. Main types of damage of above coatings used in the design of labyrinth seals during operation of gas turbine engines were shown. In connection with the necessity of raising temperature of gases in turbines of aircraft engines, it was proposed to additionally dope the serial nickel-based coatings with yttrium-containing master alloys. The results of study of influence of doping of the wearing-in sealing coatings on operating properties in conditions of action of a high-temperature gas flow were presented. It was found that doping of the KNA-82 serial coating with a multicomponent Co-Ni-Cr-Al-Y master alloy is the most rational solution.

It was established that the use of the developed coating in a temperature range of 1,100...1,200 °C makes it possible to reduce specific consumption of fuel by aircraft engines by improving turbine efficiency and prevent wear of the end faces of ridges of the rotor labyrinth seal. Based on simulation of flow in the labyrinth seal clearance by numerical method, it was shown that the use of the developed coating materials in seals of the compressor turbine and the free turbine makes it possible to reduce amount of cooling air leakage into the turbine air-gas channel by reducing wear of tops of the labyrinth rotor seal ridge

Author Biographies

Viktor Greshta, Zaporizhzhia National Technical University Zhukovskoho str., 64, Zaporizhzhia, Ukraine, 69063

PhD, Professor

Department of Physical Materials Science

Daria Tkach, Zaporizhzhia National Technical University Zhukovskoho str., 64, Zaporizhzhia, Ukraine, 69063

PhD

Department of Physical Materials Science

Eugene Sotnikov, Motor Sich JSC Motorostroiteley аve., 15, Zaporizhzhia, Ukraine, 69068

Head of workshop No. 3

Dmytro Pavlenko, Zaporizhzhia National Technical University Zhukovskoho str., 64, Zaporizhzhia, Ukraine, 69063

PhD, Associate Professor

Department of aircraft engine technologies

Olexandr Klymov, Zaporizhzhia National Technical University Zhukovskoho str., 64, Zaporizhzhia, Ukraine, 69063

PhD, Associate Professor

Department of Physical Materials Science

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Published

2018-08-21

How to Cite

Greshta, V., Tkach, D., Sotnikov, E., Pavlenko, D., & Klymov, O. (2018). Studying and designing improved coatings for labyrinth seals of gas­turbine engine turbines. Eastern-European Journal of Enterprise Technologies, 4(12 (94), 56–63. https://doi.org/10.15587/1729-4061.2018.140912

Issue

Vol. 4 No. 12 (94) (2018): Materials Science

Section

Materials Science

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Copyright (c) 2018 Viktor Greshta, Daria Tkach, Eugene Sotnikov, Dmytro Pavlenko, Olexandr Klymov

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