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Volume 9
Issue 12
10.3390/pr9122179
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Article

Large Eddy Simulation of Leakage Flow in a Stepped Labyrinth Seal

by
Ji-Hwan Kim
1 and
Joon Ahn
2,*
1
Department of Mechanical Engineering, Graduate School, Kookmin University, 77 Jeongneung-ro, Seongbuk-gu, Seoul 02707, Korea
2
School of Mechanical Engineering, Kookmin University, 77 Jeongneung-ro, Seongbuk-gu, Seoul 02707, Korea
*
Author to whom correspondence should be addressed.
Processes 2021, 9(12), 2179; https://doi.org/10.3390/pr9122179
Submission received: 8 November 2021 / Revised: 25 November 2021 / Accepted: 30 November 2021 / Published: 2 December 2021
(This article belongs to the Section Manufacturing Processes and Systems)
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Abstract

Large eddy simulation (LES) and Reynolds averaged Navier-Stokes simulation (RANS) of leakage flow in straight-through and stepped labyrinth seals were performed in order to compare their performances in sealing the secondary flow passage of the gas turbine based on the respective discharge coefficients. The results indicate a 17.8% higher leakage prevention performance for the stepped seal relative to that of the straight seal. Further, while the LES predicts an ~7% reduction in the discharge coefficient due to shaft rotation, this effect is underestimated by the RANS. Moreover, the LES correctly predicts a laminarized flow pattern in the clearance, whereas the RANS overestimates the turbulence kinetic energy. In addition, a turbulence kinetic energy spectrum analysis was performed based on the vorticity at selected points in order to identify the flow structure that has a dominant influence on the oscillation of the discharge coefficient. This analysis also enabled identification of the changes in the flow structure due to shaft rotation.
Keywords: gas turbine; labyrinth seal; Reynolds averaged Navier-Stokes simulation (RANS); large eddy simulation (LES); discharge coefficient; turbulence kinetic energy; power spectrum gas turbine; labyrinth seal; Reynolds averaged Navier-Stokes simulation (RANS); large eddy simulation (LES); discharge coefficient; turbulence kinetic energy; power spectrum

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MDPI and ACS Style

Kim, J.-H.; Ahn, J. Large Eddy Simulation of Leakage Flow in a Stepped Labyrinth Seal. Processes 2021, 9, 2179. https://doi.org/10.3390/pr9122179

AMA Style

Kim J-H, Ahn J. Large Eddy Simulation of Leakage Flow in a Stepped Labyrinth Seal. Processes. 2021; 9(12):2179. https://doi.org/10.3390/pr9122179

Chicago/Turabian Style

Kim, Ji-Hwan, and Joon Ahn. 2021. "Large Eddy Simulation of Leakage Flow in a Stepped Labyrinth Seal" Processes 9, no. 12: 2179. https://doi.org/10.3390/pr9122179

APA Style

Kim, J.-H., & Ahn, J. (2021). Large Eddy Simulation of Leakage Flow in a Stepped Labyrinth Seal. Processes, 9(12), 2179. https://doi.org/10.3390/pr9122179

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