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Research Papers

Investigations on the Rotordynamic Characteristics of a Hole-Pattern Seal Using Transient CFD and Periodic Circular Orbit Model

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

Institute of Turbomachinery, Xi’an Jiaotong University, Xi’an 710049, P.R.China

Jun Li1

Institute of Turbomachinery, Xi’an Jiaotong University, Xi’an 710049, P.R.Chinajunli@mail.xjtu.edu.cn

1

Corresponding author.

J. Vib. Acoust 133(4), 041007 (Apr 08, 2011) (9 pages) doi:10.1115/1.4003403 History: Received October 24, 2009; Revised November 10, 2010; Published April 08, 2011; Online April 08, 2011

Numerical investigations on the rotordynamic characteristics of a typical hole-pattern seal using transient three-dimensional Reynolds-averaged Navier–Stokes (RANS) solution and the periodic circular orbit model were conducted in this work. The unsteady solutions combined with mesh deformation method were utilized to solve the three-dimensional RANS equations and obtain the transient reaction forces on a typical hole-pattern seal rotor at five different excitation frequencies. The relation between the periodic reaction forces and frequency dependent rotordynamic coefficients of the hole-pattern seal was obtained by considering the rotor with a periodic circular orbit (including forward orbit and backward orbit) of the seal center. The rotordynamic coefficients of the hole-pattern seal were then solved based on the obtained unsteady reaction forces and presented numerical method. Compared with the experimental data, the predicted rotordynamic coefficients of the hole-pattern seal are more agreeable with the experiment than that of the ISO-temperature (ISOT) bulk flow analysis and numerical approach with one-direction-shaking model. Furthermore, the unsteady leakage flow characteristics in the hole-pattern seal were also illustrated and discussed in detail.

Copyright © 2011 by American Society of Mechanical Engineers
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References

Figures

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Figure 1

Leakage flow in hole-pattern seal

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Figure 2

Ideal status of the seal rotation (concentric)

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Figure 3

Circular orbit model (eccentric, present)

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Figure 4

Chochua and Soulas’ one-direction shaking model (12)

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Figure 5

Hole distributions (6)

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Figure 6

Computational model of the hole-pattern seal

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Figure 7

Computational grid of the hole-pattern seal (partial)

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Figure 8

Reaction force on the rotor for ±20 Hz

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Figure 9

Reaction force on the rotor for ±50 Hz

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Figure 10

Reaction force on the rotor for ±100 Hz

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Figure 11

Reaction force on the rotor for ±200 Hz

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Figure 12

Reaction force on the rotor for ±250 Hz

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Figure 13

Cross coupled damping versus excitation frequency

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Figure 14

Direct damping versus excitation frequency

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Figure 15

Cross coupled stiffness versus excitation frequency

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Figure 16

Direct stiffness versus excitation frequency

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Figure 17

Effective stiffness versus excitation frequency

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Figure 18

Effective damping versus excitation frequency

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Figure 19

The transient meridian flow fields (f=+50 Hz): (a) velocity vector distributions in the first 4 holes and (b) velocity magnitude plots in the first two holes

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Figure 22

Static pressure contours at the cross section of z=12.5 mm in the hole-pattern seal (f=+50 Hz)

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Figure 21

Enlarged view of label A in Fig. 2(f=+50 Hz)

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Figure 20

Transient static pressure on the rotor for the hole-pattern seal (f=+50 Hz)

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