Publication detail

Fluid thermal effect on non-contacting labyrinth seal of 20 MW steam turbine

MAMMAR, L. TAYEB, Y. LADJEDEL, O. ŠIKULA, O.

Original Title

Fluid thermal effect on non-contacting labyrinth seal of 20 MW steam turbine

Type

journal article in Web of Science

Language

English

Original Abstract

This paper is divided into two parts; the first describes a CFD analysis of a gland packing labyrinth seals in 20 MW steam turbine in LNG plant using ANSYS CFX code as an isothermal simulation in fluid domain. The results of two turbulence models k-ε and k-ω SST are compared and validated against experimental data. It is shown that the labyrinth seal leakage is proportional to the clearance cube so any variation in clearance can have a significant impact on the steam leakage. This clearance between the shaft and the labyrinth seal vary as a function of operating temperature due to the different rates of thermal expansion of the materials for these two components. Likewise the fluid temperature has a direct effect on fluid dynamic behavior. For that; the second part of the paper investigates the effect of fluid thermal conditions of the labyrinth seal via the heat transfer and Nusselt number variation in the stator and the rotor, for different cases of inlet temperature (400 °C, 200 °C, 100 °C, 50 °C) and pressure ratio (2.5, 4.5, 6.5) for an ideal gas. Also it is important to know the temperature distribution across tooth and cavities of the labyrinth seal, and finally the Influence of Inlet total temperature on fluid pressure drop in the labyrinth seal will be treated for improving and readjusting the steam turbine sealing system.

Keywords

CFD analyses;Heat transfer;Labyrinth seals;Steam turbine;Turbomachinery

Authors

MAMMAR, L.; TAYEB, Y.; LADJEDEL, O.; ŠIKULA, O.

Released

17. 12. 2019

Publisher

Faculty of Mechanical Engineering of the Budapest University of Technology and Economics

Location

Budapest

ISBN

0324-6051

Periodical

Periodica Polytechnica Mechanical Engineering

Year of study

64

Number

1

State

Hungary

Pages from

31

Pages to

42

Pages count

4

URL

https://pp.bme.hu/me/article/view/14176

Full text in the Digital Library

http://hdl.handle.net/11012/208759

BibTex

@article{BUT162761,
  author="Lahouari {Mammar} and Yahiaoui {Tayeb} and Omar {Ladjedel} and Ondřej {Šikula}",
  title="Fluid thermal effect on non-contacting labyrinth seal of 20 MW steam turbine",
  journal="Periodica Polytechnica Mechanical Engineering",
  year="2019",
  volume="64",
  number="1",
  pages="31--42",
  doi="10.3311/PPme.14176",
  issn="0324-6051",
  url="https://pp.bme.hu/me/article/view/14176"
}