Email this article Increasing the longevity of rotary bearings in gas turbine engines with air-fuel lubrication systems
- Authors: Klimov V.N.1, Falaleev S.V.2
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Affiliations:
- Branch of PJSC “UEC-Saturn” - Omsk Engine Design Bureau
- Samara National Research University
- Issue: Vol 11, No 1 (2025): 30.04.2025
- Pages: 27-39
- Section: Articles
- URL: https://bakhtiniada.ru/2409-4579/article/view/312370
- DOI: https://doi.org/10.18287/2409-4579-2025-11-1-27-39
- ID: 312370
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Abstract
Turbojet engines with an air-fuel lubrication system are used in small-sized high-speed aircraft. In these engines, the cooling of rotary bearings is accomplished using air extracted from the compressor, while lubrication is provided by fuel drawn from the fuel pipeline. Under fuel lubrication, bearings operate under boundary friction conditions across a wide range of rotational frequencies and loads, which results in their limited longevity and reduced maintenance intervals for gas turbine engines (GTE). This study presents a computational analysis assessing the impact of bearing size, lubricant film temperature, rotational frequency, and axial load on the longevity of bearings lubricated and cooled by the air-fuel mixture. Methods to enhance the durability of rotary bearings in GTEs lubricated and cooled by the air-fuel mixture are delineated. The findings can be applied in the design of GTEs with air-fuel lubrication systems to extend the longevity of rotary bearings and consequently increase the maintenance intervals of the engines. The results obtained in the work are the product of the United Engine Corporation (UEC) activities.
About the authors
Vitaliy N. Klimov
Branch of PJSC “UEC-Saturn” - Omsk Engine Design Bureau
Email: klimov-vitaliy-asp@yandex.ru
Candidate of Science (Engineering), Head of the Department
of Transmissions, Oil Systems and Bearings
Sergey V. Falaleev
Samara National Research University
Author for correspondence.
Email: sergey_falaleev@mail.ru
Doctor of Science (Engineering), Professor, Head of the Department of Aircraft Engine Design and Engineering
Russian Federation, SamaraReferences
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