Experimental research and CFD calculations based investigations into gas flow in a short segment of a heavily worn straight through labyrinth seal

• Autorzy: Joachimiak D. , Krzyślak P.
• Języki publikacji: EN

Abstrakty

EN

Steam turbines are used as propulsion components in not only power plants but also on merchant and naval ships. The geometry of the steam turbine seals changes throughout the machine life cycle. The rate of deterioration of these seals, in turn, affects heavily the efficiency of the thermal machine. However, the literature overview does not provide any research reports on flow phenomena occurring in heavily deteriorated seals. The paper describes the course and results of investigations into a model straight through labyrinth seal composed of 4 discs, each with the slot height of 2 mm. The investigations have been conducted with air as the working medium. Changes of gas flow parameters due to wear were analysed. Based on the experimental data, more intensive leakage was observed as the result of the increased slot height. The static pressure distribution along the examined segment was measured. The experimentally recorded distribution differed remarkably from the theoretical assumptions. Another part of the experimental research focused on comparing the gas velocities at points situated upstream of the first and second seal disc. The velocity measurements were carried out using a constant temperature wire probe. This part of the investigations provided opportunities for analysing the influence of seal wear on gas flow conditions in the seal segment. The paper compares the results of the experimental research with those obtained using the CFX software. The presented results of velocity distributions provide a clear picture of the nature of the gas flow in the seal, which enables its analysis.

Słowa kluczowe

EN

labyrinth seals; turbomachines; fluid-flow machines; experiment; CFD; gas velocity

• Wydawca: Gdańsk University of Technology, Faculty of Ocean Engineering & Ship Technology
• Czasopismo: Polish Maritime Research
• Rocznik: 2017
• Tom: nr 2
• Strony: 83--88
• Opis fizyczny: Bibliogr. 19 poz., rys., tab.

Twórcy

autor

Joachimiak D.

• Poznań University of Technology Piotrowo 3 60-965 Poznan Poland

autor

Krzyślak P.

• Poznań University of Technology Piotrowo 3 60-965 Poznan Poland

Bibliografia

• 1. Alexander O. Pugachev a, Yury A. Ravikovich b, Leonid A. Savin., Flow structure in a short chamber of a labyrinth seal with a backward-facing step, Elsevier, Computers & Fluids, 114, pp. 39–47, 2015
• 2. Anker J. E., Mayer J. F., Stetter H., Computational Study of the Flow in an Axial Turbine with Emphasis on the Interaction of Labyrinth Seal Leakage Flow and Main Flow, E. Krause et al. (eds.), High Performance Computing in Science and Engineering 2001, Springer-Verlag Berlin Heidelberg, 2002.
• 3. Anker J. E., Mayer J. F., Casey M., The impact of rotor labyrinth seal leakage flow on the loss generation in an axial turbine, Proceedings of the Institution of Mechanical Engineers, Vol. 219, Part A, Journal Power and Energy, 2005
• 4. Hodkinson B., Estimation of the leakage through a labyrinth gland, Proceedings of the institution of Mechanical Engineers 141, 1939
• 5. Hu D., Jia L., Yang L., Dimensional Analysis on Resistance Characteristics of Labyrinth Seals, Journal of Thermal Science, Vol.23, No.6, pp. 516-522, 2014
• 6. Joachimiak D., Krzyślak P., Comparison of results of experimental research with numerical calculations of a model one-sided seal, Archives of Thermodynamics, Vol. 36, No. 2, pp. 61–74, 2015
• 7. Joachimiak D.: The labyrinth seals research with extraction. PhD thesis, Poznan University of Technology, Poznan 2013 (in Polish).
• 8. Krzyślak P., Winowiecki M., A method of diagnosing labyrinth seals in fluid-flow machines, Polish Maritime Research 3(57), 15, pp. 38-41, 2008
• 9. Li J., Wen K., Wang S., Jiang S., Kong X., Experimental and numerical investigations on the leakage flow characteristics of labyrinth seals, Heat Mass Transfer and Energy Conversion AIP Conf. Proc. 1547, pp. 164-172, 2013
• 10. Stępień R., Kosowski K., Remarks on aerodynamic forces in seals of turbine stages, Polish Maritime Research, Special issue 2009/S1; pp. 58-63
• 11. Stępień R., Kosowski K., Piwowarski M., Badur J.: Numerical and Experimental Investigations into Pressure Field in Blade Shroud Clearance, Part II: Numerical Analysis, Task Quarterly, 2003
• 12. Thiekle G., Stetter H.; Identification of friction factors for modelling the exciting forces caused by flow in labyrinth seals, Rotordynamics ‘92, Springer-Verlag London, 1992
• 13. Tong Seop Kim, and Kyu Sang Cha, Comparative analysis of the influence of labyrinth seal configuration on leakage behavior, Journal of Mechanical Science and Technology, pp. 2830-2838, 2009
• 14. Traupel W. Termische turbomaschinen, Ester B., Springer 2001
• 15. Wan-Fu Zhang a, Jian-Gang Yang b, Chun Li a, Yong-Wei Tian, Comparison of leakage performance and fluidinduced force of turbine tip labyrinth seal and a new kind of radial annular seal, Computers & Fluids, 105, pp. 125–137, 2014
• 16. Trütnovsky K., Berührungsfreie Dichtungen, Grundlagen und Anwendungen der Strömung durch Spalte und Labyrinthe, VDI-Verlag bh Düsseldorf, Verlag des Vereins Deutscher Ingenieure 1964.
• 17. Winowiecki M., The method of diagnosing labyrinth seals flow machines. PhD thesis, Poznan University of Technology, Poznan 2009 (in Polish)
• 18. Yamada, Y., On the pressure loss of flow between rotating co-axial cylinders with rectangular grooves, Bulletin of the JSME, 5 (20), pp 642-651. 1962
• 19. Zimmerman H. and Wolff, K. H., 1987, “Comparison between Empirical and Numerical Labyrinth Flow Correlations,” ASME 87-GT-86. 20. ANSYS. ANSYS CFX-solver theory guide. ANSYS, Inc., Release 14.5; 2012

Uwagi

PL

Opracowanie ze środków MNiSW w ramach umowy 812/P-DUN/2016 na działalność upowszechniającą naukę (zadania 2017)