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Research Papers

Investigations on the Discharge and Total Temperature Increase Characteristics of the Labyrinth Seals With Honeycomb and Smooth Lands

[+] Author and Article Information
Xin Yan, Liming Song, Zhenping Feng

Institute of Turbomachinery, School of Energy and Power Engineering, Xi’an Jiaotong University, Xi’an 710049, P. R. China

Jun Li

Institute of Turbomachinery, School of Energy and Power Engineering, Xi’an Jiaotong University, Xi’an 710049, P. R. Chinajunli@mail.xjtu.edu.cn

J. Turbomach 131(4), 041009 (Jul 02, 2009) (8 pages) doi:10.1115/1.3068320 History: Received August 21, 2008; Revised September 01, 2008; Published July 02, 2009

The viscous work generated by the rotating components of a seal not only represents a direct loss of power but also causes an increase in the total temperature of fluid (windage effect). In order to study the discharge and total temperature increase characteristics of the stepped labyrinth seals with smooth and honeycomb lands, 3D Reynolds-averaged Navier–Stokes solutions from CFX is used in this work. At first, the influences of the inlet preswirl, leakage flow rate, and rotational speed on the total temperature increase in the convergent and divergent stepped labyrinth seals with smooth and honeycomb lands are conducted. The obtained 3D numerical results are well in agreement with the referenced experimental data. It shows that the utilized numerical approach has sufficient precision to predict the total temperature increase in seals. Then, a range of pressure ratios and four sizes of sealing clearance are performed to investigate the effects of sealing clearances and pressure ratio impact on the discharge and total temperature increase of the stepped labyrinth seals with honeycomb and smooth liners.

Copyright © 2009 by American Society of Mechanical Engineers
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References

Figures

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Figure 1

Stepped labyrinth seal geometry

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Figure 2

Calculated seal mesh and boundary condition definition

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Figure 3

σ versus Mu in the convergent labyrinth seal (Rex=10,000)

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Figure 4

σ versus Mu in the divergent labyrinth seal (Rex=10,000)

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Figure 5

σ versus Mu in the 1/16 in. honeycomb cell seal

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Figure 6

Swirl velocity at x=17.5 mm, divergent flow, smooth configuration (Mu≈0.46, Rex=10,000)

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Figure 7

Swirl velocity a x=22.5 mm, divergent flow, smooth configuration (Mu≈0.46, Rex=10,000)

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Figure 8

Leakage flow versus π of the honeycomb configuration

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Figure 9

Leakage flow versus π of the smooth configuration

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Figure 10

Windage power versus leakage flow of the honeycomb configuration

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Figure 11

Windage power versus leakage flow of the smooth configuration

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Figure 12

σ versus π in the honeycomb configuration

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Figure 13

σ versus π in the smooth configuration

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Figure 14

Static pressure contours and velocity vector distribution of the stepped labyrinth seal with smooth land, convergent flow

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Figure 15

Static pressure contours and velocity vector distribution of the stepped labyrinth seal with honeycomb land, convergent flow

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