The leakage rate of the labyrinth brush seal was experimentally measured and numerically investigated in this paper. Four different rotational speeds of 0, 1500, 2400 and 3000 rpm were utilized to investigate the effects on the leakage rate of the labyrinth brush seal. In addition, five different pressure ratios and two initial clearances were also adopted to study the influences of pressure ratio and clearance size on the leakage rate of the labyrinth brush seal. The leakage rates of the experimental labyrinth brush seal at different rotational speeds, pressure ratios, and initial clearances were also predicted using Reynolds-averaged Navier-Stokes (RANS) solutions coupling with a non-Darcian porous medium model. The rotor centrifugal growth and bristle blow-down effects were considered in the present numerical research. The rotor centrifugal growth at different rotational speeds was calculated using the finite element method (FEM). The variation of the sealing clearance size with rotor centrifugal growth and bristle blow-down was analyzed. The numerical leakage rate was in good agreement with the experimental data. The effects of rotational speeds, pressure ratios, and clearance sizes on the leakage flow characteristics of brush seals were also investigated based on the experimental data and numerical results. The detailed leakage flow fields and pressure distributions of the brush seals were also presented.

References

References
1.
Chupp
,
R. E.
,
Hendricks
,
R. C.
,
Lattime
,
S. B.
, and
Steinetz
,
B. M.
, 2006, “
Sealing in Turbomachinery
,”
J. Propul. Power
,
22
(
2
), pp.
313
349
.
2.
Neef
,
M.
,
Sulda
,
E.
,
Suerken
,
N.
, and
Walkenhorst
,
J.
, 2006, “
Design Features and Performance Details of Brush Seals for Turbine Applications
,” ASME Paper No. GT2006-90404.
3.
Chen
,
L. H.
,
Wood
,
P. E.
,
Jones
,
T. V.
, and
Chew
,
J. W.
, 1999, “
An Iterative CFD and Mechanical Brush Seal Model and Comparison With Experimental Results
,”
ASME J. Eng. Gas Turbines Power
,
121
(
4
), pp.
656
662
.
4.
Lelli
,
D.
,
Chew
,
J. W.
, and
Cooper
,
P.
, 2006, “
Combined Three-Dimensional Fluid Dynamics and Mechanical Modeling of Brush Seals
,”
ASME J. Turbomach.
,
128
, pp.
188
195
.
5.
Dogu
,
Y.
,
Akist
,
M. F.
,
Demiroglu
,
M.
, and
Dinc
,
O. S.
, 2008, “
Evaluation of Flow Behavior for Clearance Brush Seals
,”
ASME J. Eng. Gas Turbines Power
,
130
, p.
012507
.
6.
Dinc
,
S.
,
Demiroglu
,
M.
,
Turnquist
,
N.
,
Mortzheim
,
J.
,
Goetze
,
G.
,
Maupin
,
J.
,
Hopkins
,
J.
,
Wolfe
,
C.
, and
Florin
,
M.
, 2002, “
Fundamental Design Issues of Brush Seals for Industrial Applications
,”
ASME J. Turbomach.
,
124
, pp.
293
300
.
7.
Li
,
J.
,
Obi
,
S.
, and
Feng
,
Z.
, 2009, “
The Effects of Clearance Sizes on Labyrinth Brush Seal Leakage Performance Using a Reynolds-Averaged Navier-Stokes Solver and Non-Darcian Porous Medium Model
,”
Proc. Inst. Mech. Eng., Part A
,
223
, pp.
953
964
.
8.
Ferguson
,
J. G.
, 1988, “
Brushes as High Performance Gas Turbine Seals
,” ASME Paper No. 88-GT-182.
9.
Bayley
,
F. J.
, and
Long
,
C. A.
, 1993, “
A Combined Experimental and Theoretical Study of Flow and Pressure Distributions in a Brush Seal
,”
ASME J. Eng. Gas Turbines Power
,
115
(
2
), pp.
404
410
.
10.
Carlile
,
J. A.
,
Hendricks
,
R. C.
, and
Yoder
,
D. A.
, 1993, “
Brush Seal Leakage Performance With Gaseous Working Fluids at Static and Low Rotor Speed Conditions
,”
ASME J. Eng. Gas Turbines Power
,
115
, pp.
397
403
.
11.
Turner
,
M. T.
,
Chew
,
J. W.
, and
Long
,
C. A.
, 1998, “
Experimental Investigation and Mathematical Modeling of Clearance Brush Seals
,”
ASME J. Eng. Gas Turbines Power
,
120
, pp.
573
579
.
12.
Chen
,
L. H.
,
Wood
,
P. E.
,
Jones
,
T. V.
, and
Chew
,
J. W.
, 2000, “
Detailed Experimental Studies of Flow in Large Scale Brush Seal Model and a Comparison With CFD Predictions
,”
ASME J. Eng. Gas Turbines Power
,
122
, pp.
672
679
.
13.
Braun
,
M. J.
, and
Kudriavtsev
,
V. V.
, 1995, “
A Numerical Simulation of a Brush Seal Section and Some Experimental Results
,”
ASME J. Turbomach.
,
117
, pp.
190
202
.
14.
Kudriavtsev
,
V. V.
, and
Braun
,
M. J.
, 1996, “
Model Developments for the Brush Seal Numerical Simulation
,”
J. Propul. Power
,
12
(
1
), pp.
193
201
.
15.
Chew
,
J. W.
,
Lapworth
,
B. L.
, and
Millener
,
P. J.
, 1995, “
Mathematical Modeling of Brush Seals
,”
Int. J. Heat Fluid Flow
,
16
(
6
), pp.
493
500
.
16.
Chew
,
J. W.
, and
Hogg
,
S. I.
, 1997, “
Porosity Modeling of Brush Seals
,”
ASME J. Tribol.
,
119
, pp.
769
775
.
17.
Dogu
,
Y.
, 2005, “
Investigation of Brush Seal Flow Characteristics Using Bulk Porous Medium Approach
,”
ASME J. Eng. Gas Turbines Power
,
127
, pp.
136
144
.
18.
Dogu
,
Y.
, and
Aksit
,
M. F.
, 2006, “
Effects of Geometry on Brush Seal Pressure and Flow Fields—Part I: Front Plate Configurations
,”
ASME J. Turbomach.
,
128
(
1
), pp.
367
378
.
19.
Dogu
,
Y.
, and
Aksit
,
M. F.
, 2006, “
Effects of Geometry on Brush Seal Pressure and Flow Fields—Part II: Backing Plate and Configurations
,”
ASME J. Turbomach.
,
128
(
1
), pp.
379
389
.
20.
Pugachev
,
A. O.
, and
Helm
,
P.
, 2009, “
Calibration of Porous Medium Models for Brush Seals
,”
Proc. Inst. Mech. Eng., Part A
,
223
, pp.
83
91
.
21.
Ergun
,
S.
, 1952, “
Fluid Flow Through Packed Columns
,”
Chem. Eng. Prog.
,
48
, pp.
89
94
.
22.
Bird
,
R. B.
,
Stewart
,
W. E.
, and
Lightfoot
,
E. N.
, 1960,
Transport Phenomena
,
Wiley
,
New York.
23.
Holle
,
G. F.
,
Chupp
,
R. E.
, and
Dowler
,
C. A.
, 1992, “
Brush Seal Leakage Correlations Based on Effective Thickness
,” Proceedings of the Fourth International Symposium on Transport Phenomena and Dynamics of Rotating Machinery (ISROMAC-4),
Honolulu
,
HI
, Apr. 5–8, pp.
296
304
.
24.
Li
,
J.
,
Qiu
,
B.
,
Jiang
,
S.
,
Kong
,
X.
, and
Feng
,
Z.
, 2012, “
Experimental and Numerical Investigations on the Leakage Flow Characteristics of the Labyrinth Brush Seal
,” ASME Paper No. GT2012-69293.
25.
ANSYS package, “Solid 45 Element Description,” Ansys Help.
26.
Crudgington
,
P. F.
, and
Bowsher
,
A.
, 2003, “
Brush Seal Blow Down
,” AIAA Paper No. 2003-4697.
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