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Research Papers: Gas Turbines: Structures and Dynamics

Effects of Inlet Preswirl and Cell Diameter and Depth on Honeycomb Seal Characteristics

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

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

Jun Li1

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

1

Corresponding author.

J. Eng. Gas Turbines Power 132(12), 122506 (Aug 30, 2010) (13 pages) doi:10.1115/1.4001296 History: Received October 08, 2009; Revised January 11, 2010; Published August 30, 2010; Online August 30, 2010

Three-dimensional Reynolds-averaged Navier–Stokes solutions are employed to investigate the discharge and total temperature increase characteristics of the stepped labyrinth seal with honeycomb land. First, the relations between the windage heating number and the circumferential Mach number at different Reynolds numbers for different honeycomb seals are calculated and compared with the experimental data. The obtained numerical results show that the present three-dimensional periodic model can properly predict the total temperature increase in honeycomb seals. Then, a range of pressure ratios, three inlet preswirl ratios, four sizes of honeycomb cell diameter, and nine sizes of cell depth are selected to investigate the influence of inlet preswirl ratios and honeycomb geometry sizes on the discharge and total temperature increase characteristics of the stepped labyrinth seal. It shows that the leakage rate increases with the increase in cell diameter, and the cell depth has a strong influence on the discharge behavior. However, the influence of the inlet preswirl on the leakage rate is found to be little in the present study. For the total temperature increase characteristic, the inlet preswirl ratio and pressure ratio have more pronounced influence than those of cell depth and diameter. Furthermore, the relations between the leakage rate and cell depth and diameter, as well as the relations between the windage heating power and cell depth and diameter, are not monotonic functions if the pressure ratio is kept constant.

Copyright © 2010 by American Society of Mechanical Engineers
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References

Figures

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Figure 1

High pressure turbine cooling system (4)

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Figure 2

Benchmark seal geometry (7)

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Figure 3

Computational seal model with different cell diameters

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Figure 4

Computational mesh of the seals

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Figure 5

σ versus Mu for the 1/16 in. honeycomb seal (8)

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Figure 6

σ versus Mu for the 1/32 in. honeycomb seal

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Figure 7

Leakage rate versus Π at different preswirl ratios

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Figure 8

ΔTtotal versus Π at different preswirl ratios

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Figure 9

H versus Π at different preswirl ratios

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Figure 10

H versus leakage rate at different preswirl ratios

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Figure 11

Meridian flow field of the honeycomb seal (Π=1.3)

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Figure 12

Meridian flow field of the smooth labyrinth seal (Π=1.3)

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Figure 13

Leakage rate versus π with different HCDs

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Figure 14

ΔTtotal versus π with different HCDs

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Figure 15

H versus π with different HCDs

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Figure 16

H versus leakage rate with different HCDs

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Figure 17

Velocity vector distributions and ΔTtotal contours in 0 in. honeycomb seal (π=1.1)

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Figure 18

Velocity vector distributions and ΔTtotal contours in 1/32 in. honeycomb seal (π=1.1)

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Figure 19

Velocity vector distributions and ΔTtotal contours in 1/16 in. honeycomb seal (π=1.1)

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Figure 20

Velocity vector distributions and ΔTtotal contours in 1/8 in. honeycomb seal (π=1.1)

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Figure 21

Computational geometrical model of the honeycomb seals with different cell depths

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Figure 22

The leakage rate versus cell depth

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Figure 23

ΔTtotal versus cell depth

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Figure 24

H versus cell depth

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Figure 25

Velocity vector distributions and ΔTtotal contours in honeycomb seals with different cell depth

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