Layout of the prospective segmental plain bearing made from ceramic material of porous structure for high-speed gas turbine engine rotors

Aeronautical and Space-Rocket Engineering


Аuthors

Kulalaev V. V.*, Zyul’kova M. V.**, Svodin P. A.***

Lyulka Desing Bureau, 13, Kasatkina str., Moscow, 129301, Russia

*e-mail: kulalayev.viktor@gmail.com
**e-mail: marri@nxt.ru
***e-mail: svodin.pavel@gmail.com

Abstract

The main issue of promising aircraft designing is the issue of improving its performance characteristics, which, in turn, requires aircraft engine designing engineers to ensure higher values of power plant cycle thermo-gas- dynamic parameters. This becomes possible due to application of front-end technologies of material science, a more advanced level of compressor blades and turbines profiling, as well as operating rotational speeds increasing of the power plants rotors. Operating rotational speeds values increasing of the power plant shaft leads to the operational conditions complication, increase in temperature and power loads on the subassemblies and AGTD elements, in this respect new design and technological solutions when product designing are required.

Particularly, on achieving higher rotor speeds, serious loading increase on the engine rotor system and its elements, especially on bearing supports, which turn out to be in more complex operating conditions, which leads to severe life cycle reduction and failure inception [1]. Both cognizance and experience in the fields of materials science and technology of structural materials production, stored as of today, allow application of various state- of-the-art materials with enhanced strength characteristics, such as composite ceramic materials (CCM), in the AGTE units designs. Gradual implementation of these materials in stressed subassemblies of engines [2-5], such as combustion chambers and blade machines due to the enhanced (compared to the alternative materials) values of strength parameters, i.e. heat resistance, heat stability, hardness and melting temperature.

As of today, leading-in-industry foreign countries are already conducting research on the subject of plain bearings for low-speed rotors from porous ceramic material. Both experimental and theoretical experience described in [6-16] proved the advantage of porous ceramics application as a structural material for plain bearings.

Besides, one of the tasks while sliding bearing designing for a prospective gas turbine engine consists in the bearing optimal design scheme selecting. Presently, the main choice for actual power plants is bearings with rolling bodies, i.e. ball or roller ones. This category of bearings is convenient in operation due to their easy mounting, lack of need for a large amount of lubricant and relatively low cost. However, at high speeds of rotation of the rotor, these bearings lose their efficiency due to their service life reduction under these conditions. Besides, they produce a high noise level and wield increased values of rotating resistance. A promising option hereupon is considering the possibility of employing plain bearing in the rotor system design of a promising aircraft power plant, which main advantage is the possibility of operation at high shaft speeds.

The article presents a classification of existing schemes and types of plain bearings, on which basis the appearance of a promising plain bearing with segmented inserts from porous ceramic material for AGTD rotors supporting high operating speeds is formulated, and adduces certain suggestions for efficiency improving of its operation.

Keywords:

support bearings of GTE rotors, hybrid plain bearing, plain bearing efficiency improving, plain bearing from ceramic material, hybrid plain bearing schematic diagram

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