Study on Comb Labyrinth Seals of Francis Turbine at Different Reynolds Number

Abstract:

To research the leakage characteristics and sealing mechanism of the comb labyrinth seals, three-dimensional solutions of NavierStokes governing equations are utilized to investigate the leakage characteristics of the comb Labyrinth for water sealing in leakage flow passage of Francis turbine. The finite volume method is used to discretize the Navier-Stokes equations. The quick scheme and the second central scheme are applied to solve convection and diffusion terms respectively. Distributions of velocity and streamline as well as some flow structure in leakage flow passage are gained at different Reynolds numbers. The results show that vortex generated in the comb consumes kinetic energy and causes the pressure decrease greatly, which play a major role in decreasing the leakage flux.

• Periodical: Applied Mechanics and Materials (Volumes 444-445)
• Pages: 423-426
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.444-445.423
• Online since: October 2013
• Authors: Wen Quan Wang, Shi Qi Su, Yan Yan
• Keywords: Comb Labyrinth Seals, Francis Turbine, Numerical Simulation, Reynolds Number

References

[1] He Kun, Li Jun, Yan Xin, et al. Investigations of the conjugate heat transfer and windage effect in stepped labyrinth seals . International Journal of Heat and Mass Transfer, 2012, 55: (17-18): 4536-4547.

DOI: 10.1016/j.ijheatmasstransfer.2012.03.045

[2] Wang Wenquan, Zhang Lixiang, Yan Yan, Investigate of the leakage characteristics of the honeycomb seals for water. Journal od Drainage and Irrigation Machinery and Engineering, 2010, 31(3): 248-252．(In chinese).