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Research Papers: Gas Turbines: Structures and Dynamics

Numerical Investigations on Leakage Performance of the Rotating Labyrinth Honeycomb Seal

[+] Author and Article Information
Jun Li

Institute of Turbomachinery, Xi’an Jiaotong University, Xi’an 71049, P.R.C.; Department of Mechanical Engineering, Keio University, Yokohama 223-8522, Japanjunli@mail.xjtu.edu.cn

Shengru Kong, Xin Yan, Zhengping Feng

Institute of Turbomachinery, Xi’an Jiaotong University, Xi’an 71049, P.R.C.

Shinnosuke Obi

Department of Mechanical Engineering, Keio University, Yokohama 223-8522, Japan

J. Eng. Gas Turbines Power 132(6), 062501 (Mar 16, 2010) (11 pages) doi:10.1115/1.4000091 History: Received March 03, 2009; Revised June 17, 2009; Published March 16, 2010; Online March 16, 2010

Three-dimensional Reynolds-averaged Navier–Stokes (RANS) solutions from CFX were utilized to investigate the leakage flow characteristics in the labyrinth honeycomb seal of steam turbines. At first, the accuracy and reliability of the utilized RANS approach was demonstrated using the published experimental data of the honeycomb seal. It showed that the utilized numerical method has sufficient precision to predict the leakage performance in seals. Then a range of sealing clearances, cell diameters, cell depths, rotation speeds, and pressure ratios were investigated to determine how these factors affect the leakage flow rate of the labyrinth honeycomb seal. The computed leakage flow rate increased with increasing sealing clearance and pressure ratios. Furthermore, the results show that the studied labyrinth honeycomb seal has the optimum sealing performance in the case of honeycomb cell diameter equals labyrinth step width, and the ratio of the honeycomb cell depth to honeycomb cell diameter is 0.93 under the designed condition. The flow pattern of each case is also illustrated to describe the leakage flow characteristics in labyrinth honeycomb seals.

Copyright © 2010 by American Society of Mechanical Engineers
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References

Figures

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Figure 2

Geometrical parameters of the labyrinth seal with honeycomb lands (6)

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Figure 3

Boundary condition definitions

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Figure 4

Velocity flow pattern in the labyrinth smooth seal (s1=1.204 mm, π=1.1)

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Figure 5

Comparison of the discharge coefficients between the present CFD results and the experimental data

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Figure 6

Comparison of the leakage increase parameter between the present CFD results and the experimental data

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Figure 7

Configuration and geometrical parameters of the labyrinth honeycomb seal

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Figure 8

Boundary condition definitions and the local grid

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Figure 9

Flow fields in the labyrinth honeycomb seal at two sections at the designed flow condition (T=0.75 mm, L=4.58 mm, and D=4.26 mm)

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Figure 10

Leakage flow rate with different sealing clearance sizes (D=4.26 mm)

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Figure 11

Static pressure contours and velocity distributions in the labyrinth honeycomb seal with different sealing clearance sizes (L=4.58 mm, D=4.26 mm): (a) T=0.75 mm, (b) T=0.05 mm, and (c) T=0.25 mm

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Figure 12

Leakage flow rate with different honeycomb cell diameters (T=0.75 mm, D=4.26 mm)

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Figure 13

Static pressure contours and velocity distribution in the labyrinth honeycomb seal with different cell diameters (T=0.75 mm, D=4.26 mm): (a) L=4.58 mm (L/b=1.44), (b) L=3.178 mm (L/b=1.0), and (c) L=1.37 mm (L/b=0.43)

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Figure 14

Leakage flow rate with different honeycomb cell depths (L=4.58 mm, T=0.75 mm)

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Figure 15

Velocity distribution in the labyrinth honeycomb seal with different cell depths (L=4.58 mm, T=0.75 mm)

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Figure 16

Leakage flow rate at different rotation speeds (L=4.58 mm, T=0.75 mm, D=4.26 mm)

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Figure 17

Velocity distribution in the labyrinth honeycomb seal at different rotation speeds (L=4.58 mm, T=0.75 mm, D=4.26 mm)

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Figure 18

Leakage flow rate at different pressure ratios (L=4.58 mm, T=0.75 mm, D=4.26 mm)

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Figure 19

Static pressure contours and velocity distribution in the labyrinth honeycomb seal at different pressure ratios (L=4.58 mm, T=0.75 mm, D=4.26 mm)

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Figure 1

Structural configuration of the labyrinth honeycomb seal

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