Mathematical model of fluid flow when regulating axial forces on an angular contact bearing using a special element


Аuthors

Marchukov E. Y.1, Nazarenko Y. B.1*, Kuz’min M. V.1**, Marishkin V. V.2

1. Lyulka Experimental Design Bureau, branch of the United Engine Corporation – Ufa Engine Industrial Association, 13, Kasatkina str., Moscow, 129301, Russia
2. Lytkarinsky Machine-building Plant-branch of the United Engine Corporation Ufa Engine Industrial Association, Lytkarino, Moscow region, Russia

*e-mail: nazarenko.yuri@gmail.com
**e-mail: maxim.kuzmin@okb.umpo.ru

Abstract

The article considers the regulation of the axial force on a radial-thrust bearing due to the hydrodynamic forces of oil passing through a narrowing annular gap in the radial direction between the hydrodynamic element and the flange, which is rigidly connected to the inner ring of the bearing and the shaft. The oil flows necessary to create hydrodynamic axial forces on the rotor support are subsequently used to lubricate and cool the radial-thrust bearing. An axial force directed along the flight acts on the compressor rotor, and against the flight acts on the turbine rotor, and since they are rigidly connected to each other, the resulting axial force is transmitted to the radial-thrust bearing. The axial force from the radial-thrust bearing is transmitted through the outer ring to the stator and contributes to the formation of engine thrust. The axial force of the compressor, as a rule, exceeds the axial force of the turbine rotor and additional design measures may be required to reduce the axial force on the radial-thrust bearing. To relieve the radial thrust bearing, compressed air from the last or penultimate compressor stages is supplied to the front end wall of the compressor. However, in this case, air extraction from the compressor flow path leads to a decrease in its efficiency and engine thrust. It is also possible to change the axial forces on the radial thrust bearing when the rear end of the compressor is isolated from the air compressed in the compressor using a seal. Atmospheric pressure is supplied to this end, due to which the axial force can be reduced to the required level. However, this also leads to a loss of engine thrust. The proposed hydrodynamic element allows reducing the axial force on the radial thrust bearing without losing the traction characteristics of the engine. This is due to the fact that part of the axial force from the radial thrust bearing is perceived by the hydrodynamic element, which transmits the axial force to the stator. In this case, the oil flows required to create hydrodynamic axial forces on the rotor support are used to lubricate and cool the radial thrust bearing. The reduction of the axial forces of the radial thrust bearing is achieved without additional power units that require serious design solutions and without loss of efficiency. 

Keywords:

rotor, radial thrust bearing, hydrodynamic element, engine thrust, turbine axial thrust, compressor axial thrust

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