Experimental study of gte lubricating system oil-air mixture properties

Аuthors

Gulienko A. I.^*, Schurovskiy Y. M.^**

Central Institute of Aviation Motors named after P.I. Baranov, CIAM, 2, Aviamotornaya str., Moscow, 111116, Russia

*e-mail: goulienko-contrl@ciam.ru
**e-mail: shchurovsky@ciam.ru

Abstract

Lubricating system of the gas turbine engine rotor supports in many ways determines its operation reliability. The experience in developing aircraft GTEs lubricating systems accumulated by many manufacturers is associated with predominant employing of empirical and experimental techniques, and is not practically covered in literature. As a rule, the lubrication systems characteristics are being determined while operating with pure oil, and their recalculation onto the two-phase mixture may lead to overpower of the driving pumps motors and, as consequence, to their weight increase.

The article presents the analysis of the properties of two-phase mixtures pumped through the unit of the aircraft GTE lubrication system based on experimental data. This data was obtained at CIAM with the test bench for semi-natural simulation of lubrication system with oil chamber imitation, and installation for fine-dispersed oil-air mixture forming, where the mixture is formed by the air entrainment effect.

Using the results of oil-air mixture flow visualization, the article shows that in the area of the GTE lubrication systems operating modes the mixture may be considered as one-component homogenous media, possessing the properties of elastic continuum with homogenous sound velocity.

While air entering the exhausting duct the two-component flow of oil-air mixture and air-oil bubbles, clogging the pipe cross section and move relative to the oil-air mixture at low speed is formed.

Characteristics of a discharge gear pump, pumping the oil-air mixture, are affected not only by air and oil properties, but also by the structure formed by the pump throughput capacity.

It has been shown that in GTE lubrication systems a mode of emptying the exhaust gear pump inlet branch may occur with the possible realization of the stratified flow structure, as well as a dynamic locking mode in which a pulsating flow is formed with density waves forming and a polyharmonic fluctuations excitation in the system. Based on the experimental data, the air-oil mixture flow modes map was compiled.

The paper presents the relationships by which give possibility to calculate the thermo-physical properties of the two-phase mixture pumped in the tracts of the GTE lubrication systems. This approach showed good agreement of calculations with experiments in the lubrication system static and transient operation modes.

Keywords:

lubrication system, oil-air mixture, flow modes map

References

1. Polikovskii V.I. Samoletnye silovye ustanovki (Aircraft power plants), Moscow, Oborongiz, 1952, 600 p.

2. Domotenko N.T., Kravets A.S. Maslyanye sistemy gazoturbinnykh dvigatelei (Oil systems of gas turbine engines). Moscow, Transport, 1972, 96 p.

3. Bich M.M., Veinberg E.V., Surnov D.N. Smazka aviatsionnykh gazoturbinnykh dvigatelei (Lubrication of aicraft gas turbine engines), Moscow, Mashinostroenie, 1979, 176 p.

4. Tryanov A.E., Grishanov O.A., Butylkin S.V. Proektirovanie sistem suflirovaniya maslyanykh polostei aviatsionnykh dvigatelei (Aircraft engines oil chambers breathing systems design), Samara, SGAU, 2006, 83 p.

5. Tryanov A.E. Konstruktsiya maslyanykh system aviatsionnykh dvigatelei (Aircraft engines oil systems structures), Samara, SGAU, 2007, 81 p.

6. Inozemtsev A.A., Nikhamkin M.A., Sandratskii V.L. Avtomatika i regulirovanie aviatsionnykh dvigatelei I energeticheskikh ustanovok (Automation and control of aircraft engines and power plants), Moscow, Mashinostroenie, 2008, vol. 5, 200 p.

7. Lisitsin A.N. Povyshenie effektivnosti proektirovaniya maslyanykh polostei opor GTD na osnove metoda chislennogo modelirovaniya dvukhfaznogo techeniya (Design efficiency increase of GTE oil chambers based on two-phase flow numerical simulation method), Doctors thesis, Rybinsk, RSATU, 2015, 128 p.

8. Khaustov A.I. Vestnik Moskovskogo aviatsionnogo instituta, 2008, vol. 15, no. 1, pp. 70-76.

9. Gurevich O., Gulienko A., Schurovskiy U. Demonstration Systems of the “Electric” Gas Turbine Engine. 29th Congress ICAS, St. Petersburg, Russia, September 7–12, 2014. Paper no. ICAS2014_0218, 6 p.

10. Gulienko A.I., Shchurovskii Yu.M. Vestnik Samarskogo gosudarstvennogo aerokosmicheskogo universiteta, 2015, vol. 14, no. 3-1, pp. 250-261.

11. Gulienko A.I., Yanovskii L.S., Shchurovskii Yu.M., Molokanov A.A. Trenie i smazka v mashinakh I mekhanizmakh, 2015, no. 10, pp. 35-42.

12. Gulienko A.I., Yanovskii L.S., Shchurovskii Yu.M., Molokanov A.A. VI Mezhdunarodnaya NTK “Problemy khimmotologii: ot eksperimenta k matematicheskim modelyam vysokogo urovnya”. Sbornik izbrannykh dokladov. Moscow, Granitsa, 2016, pp. 38-46.

13. Wallis G.B. One Dimensional Two-Phase Flow. McGraw-Hill; First Edition edition, 1969, 408 p.

14. Chisholm D. Two-phase flow in pipelines and heat exchangers. London, New York, Longman Higher Education, 1983, 304 p.

15. Delhaye J.M., Giot M., Rietmuller M.L. Thermohydraulics of two-phase systems for industrial design and nuclear engineering. Washington, Hemisphere Pub. Corp., New York, McGraw-Hill, 1981, 525 p.

16. Kanarachos S. and Flouros M. The impact of flow inlet conditions on the two phase flow pattern and the heat transfer in a scavenge pipe of an Aero Engine bearing chamber sealed with brush seals. 5th International Gas Turbine Conference. 27-28 October 2010, Brussels, Belgium.

17. Belov G.O., Stadnik D.M. Vestnik Moskovskogo aviatsionnogo instituta, 2017, vol. 24, no. 2, pp. 7-14.

18. Glikman B.F. Nestatsionarnye techeniya v pnevmogidravlicheskikh tsepyakh (Nonstationary flow in pneumo-hydraulic circuits), Moscow, Mashinostroenie, 1979, 253 p.

19. Boshenyatov B.V. Izvestiya Tomskogo politekhnicheskogo universiteta, 2005, vol. 308, no. 6, pp. 156–160.

20. Ivanov I.E. Vestnik Moskovskogo aviatsionnogo instituta, 2009, vol. 16, no. 2, pp. 62-70.

21. Shchurovskii Yu.M. Trudy MAI, 2017, no. 92, available at: http://trudymai.ru/published.php?ID=76776