Improving the reliability of radial face seals of aircraft engine rotor supports

Abstract

The article presents an advanced radial face contact seal with increased operational life. High efficiency of the radial mechanical seal is ensured by the joint application of the hydrostatic and hydrodynamic lubrication principles. The hydrodynamic effect is achieved by applying the structure of fine grooves on the rotor hub. The dependence of the flow force value in the slot for a fixed-size gap on the rotor speed is presented. A prototype has been made and tested on a dynamic test bed intended for the realization of operating conditions of support seals making up a part of an aircraft engine. The results of theoretical and experimental studies are presented. Ways of improving the seal reliability due to improving the surface mechanical properties are proposed. A pattern of the development of a functional failure of the seal assembly is presented. The most adverse operating conditions and the main reasons of increased wear of the sealing surfaces are indicated.  Methods of achieving high anti-friction characteristics of contact surfaces by applying nanostructured nonporous chrome-diamond coatings are proposed. Issues concerning the creation of advanced coatings with a positive gradient of depth mechanical properties are discussed. Anti-friction, anti-seize silver-diamond coatings and the use of diffusion molecular reinforcement technology are at the basis of the production of advanced coatings. The paper indicates the importance of anti-friction and extreme-pressure additives contained in the oil.

About the authors

S. V. Falaleev

Samara State Aerospace University

Author for correspondence.
Email: kipdla@ssau.ru

Доктор технических наук, профессор

Заведующий кафедрой конструкции и проектирования двигателей летательных аппаратов

Russian Federation

P. V. Bondarchuk

Samara State Aerospace University

Email: kipdla@ssau.ru

Assistant of the Department of Construction and Design of Aircraft Engines

Russian Federation

I. D. Ibatullin

Samara State Technical University

Email: tribo@rambler.ru

Doctor of Science (Engineering), Professor

Russian Federation

R. R. Badykov

Samara State Aerospace University

Email: kipdla@ssau.ru

Assistant of the Department of Construction and Design of Aircraft Engines

Russian Federation

References

  1. Steinetz B.M., Hendricks R.C., Munson J. Advanced seal technology role in meeting next generation turbine engine goals. NASA/TM—1998-206961, 1998.
  2. Zhdanov I., Staudacher S., Falaleev S. An advanced usage of meanline loss systems for axial turbine design optimisation. Proceedings of the ASME Turbo Expo. 2013. V. 6 A. doi: 10.1115/GT2013-94323
  3. Vinogradov A.S. Seal design features for systems and units of aviation engines. Life Science Journal. 2014. V. 11, Iss. 8. P. 575-580.
  4. Lebeck A. Principles and Design of Mechanical Face Seals. John Wiley & Son, Inc., NY, 1991.
  5. Lebeck A. How much do we know about mechanical seals. Sealing Technology. 2006. Iss. 9. P. 11-12. doi: 10.1016/S1350-4789(06)71357-5
  6. Inozemtsev A.A., Sandratskiy V.L. Gazoturbinnyie dvigateli [Gas turbine engines]. Perm: Aviadvigatel' Publ., 2006. 1204 p.
  7. Belousov A.I., Falaleev S.V., Vinogradov A.S, Bondarchuk P.V. Problems of application of face gasodynamic seals in aircraft engines. Russian Aeronautics. 2007. V. 50, Iss. 4. P. 390-394. doi: 10.3103/S1068799807040083
  8. Belousov A.I., Falaleev S.V., Demura A.S. On application of the theory of face seals with microgrooves to high-speed FV engine rotors. Russian Aeronautics. 2009. V. 52, Iss. 3. P. 335-339. doi: 10.3103/S106879980903012X
  9. Müller H.K., Nau B.S. Fluid Sealing Technology: Principles and Applications. M. Dekker Inc., New York, 1998. 485 p.
  10. Falaleev S.V. Hydrodynamic characteristics of the face seal taking into account lubricant film breakdown, inertial forces and complex clearance form. Life Science Journal. 2014. V. 11, Iss. 9. P. 337-343.
  11. Lebeck A. Experiments and modeling of zero leakage backward pumping mechanical face seals. Tribology Transactions. 2008. V. 51, Iss. 4. P. 389-395. doi.org/10.1080/10402000802121650
  12. Handbook of Lubrication and Tribology. V. 2. Theory and Design, Second Edition / ed. by R.W. Bruce. CRC Press Taylor & Francis Group, 2012. 1169 p.
  13. Ibatullin I.D. Tribotekhnicheskie ispytaniya na friktsionnuyu sovmestimost' [Friction compatibility tribotechnical tests]. Samara: Samarskiy nauchnyy tsentr RAN Publ., 2014. 217 p.
  14. Gallyamov A.R., Ibatullin I.D. New technology, properties and application of nanostructured antifriction electrochemical coatings. Life Science Journal. 2014. V. 11, Iss. 12s. P. 586-591.
  15. Ibatullin I.D. Kinetika ustalostnoy povrezhdaemosti i razrusheniya poverkhnost-nykh sloev [Kinetics of fatigue damage and fracture of surface layers: monograph]. Samara: Samara State Technical University Publ., 2008. 387 p.
  16. Logvinov L.M. Tekhnicheskaya diagnostika zhidkostnykh sistem tekhnologicheskogo oborudovaniya po parametram rabochey zhidkosti [Technical diagnostics of process equipment fluid systems by the parameters of the working fluid: study guide]. Moscow: CSTI «Poisk» Publ., 1992. 90 p.
  17. Nenashev M.V., Ibatullin I.D., Markov A.S., Markov V.S. Emelyanov S.G. Diagnostic system for engine oils quality control // Izvestiya Samarskogo nauchnogo tsentra RAN. 2014. V. 16, no. 1(2). P. 464-467. (In Russ.)

Statistics

Views

Abstract: 3605

PDF (Russian): 1654

Dimensions

PlumX

Refbacks

  • There are currently no refbacks.

Copyright (c) 2016 VESTNIK of the Samara State Aerospace University

This website uses cookies

You consent to our cookies if you continue to use our website.

About Cookies