As well known, the stability assessment of turbomachines is strongly related to internal sealing components. For instance, labyrinth seals are widely used in compressors, steam, and gas turbines and pumps to control the clearance leakage between rotating and stationary parts, owing to their simplicity, reliability, and tolerance to large thermal and pressure variations. Labyrinth seals working principle consists of reducing the leakage by imposing tortuous passages to the fluid that are effective on dissipating the kinetic energy of the fluid from high-pressure regions to low-pressure regions. Conversely, labyrinth seals could lead to dynamics issues. Therefore, an accurate estimation of their dynamic behavior is very important. In this paper, the experimental results of a long-staggered labyrinth seal will be presented. The results in terms of rotordynamic coefficients and leakage will be discussed as well as the critical assessment of the experimental measurements. Eventually, the experimental data are compared to the numerical results obtained with the new bulk-flow model (BFM) introduced in this paper.

References

References
1.
Cangioli
,
F.
,
Pennacchi
,
P.
,
Vania
,
A.
,
Chatterton
,
S.
, and
Dang
,
P. V.
,
1986
, “
Analysis of the Dynamic Behavior of Two High-Pressure Turbines for the Detection of Possible Rub Symptoms
,”
ASME
Paper No. GT2016-56627
.
2.
Kirk
,
R.
,
1986
, “
Labyrinth Seal Analysis for Centrifugal Compressor Design—Theory and Practice
,”
Second IFToMM International Conference on Rotordynamics
, Tokyo, Japan.
3.
Wagner
,
N. G.
,
2000
, “
Reliable Rotor Dynamic Design of High-Pressure Compressors Based on Test Rig Data
,”
ASME J. Eng. Gas Turbines Power
,
123
(
4
), pp.
849
856
.
4.
Childs
,
D. W.
, and
Scharrer
,
J. K.
,
1986
, “
An Iwatsubo-Based Solution for Labyrinth Seals: Comparison to Experimental Results
,”
ASME J. Eng. Gas Turbines Power
,
108
, pp.
325
331
.
5.
Dang
,
P.
,
Chatterton
,
S.
,
Pennacchi
,
P.
,
Vania
,
A.
, and
Cangioli
,
F.
,
2015
, “
An Experimental Study of Nonlinear Oil-Film Forces in a Tilting-Pad Journal Bearing
,”
ASME
Paper No. DETC2015-46601
.
6.
Dang
,
P.
,
Chatterton
,
S.
,
Pennacchi
,
P.
,
Vania
,
A.
, and
Cangioli
,
F.
,
2015
, “
Investigation of Load Direction on a Five-Pad Tilting Pad Journal Bearing With Variable Clearance
,”
14th IFToMM World Congress
, Taipei, Taiwan, Oct. 25–30.
7.
Iwatsubo
,
T.
,
1980
, “
Evaluation of Instability Forces of Labyrinth Seals in Turbines or Compressors
,”
Rotordynamic Instability Problems in High Performance Turbomachinery Workshop at Texas A&M University
, Paper No. NASA CP 2133.
8.
Sreedharan
,
S.
,
Vannini
,
G.
, and
Mistry
,
H.
,
2014
, “
CFD Assessment of Rotordynamic Coefficients in Labyrinth Seals
,”
ASME
Paper No. GT2014-26999.
9.
Cangioli
,
F.
,
Pennacchi
,
P.
,
Vannini
,
G.
, and
Ciuchicchi
,
L.
,
2018
, “
Effect of Energy Equation in One Control-Volume Bulk‐Flow Model for the Prediction of Labyrinth Seal Dynamic Coefficients
,”
Mech. Syst. Signal Process.
,
98
, pp.
594
612
.
10.
Moore
,
J. J.
,
2003
, “
Three-Dimensional CFD Rotordynamic Analysis of Gas Labyrinth Seals
,”
ASME J. Vib. Acoust.
,
125
(
4
), pp.
427
433
.
11.
Vannini
,
G.
,
Cioncolini
,
S.
,
Calicchio
,
V.
, and
Tedone
,
F.
,
2011
, “
Development of a High Pressure Rotordynamic Test Rig for Centrifugal Compressors Internal Seals Characterization
,”
40th Turbomachinery Symposium
, Houston, TX, Sept. 12–15, pp. 46–59.
12.
Vannini
,
G.
,
Cioncolini
,
S.
,
Del Vescovo
,
G.
, and
Rovini
,
M.
,
2014
, “
Labyrinth Seal and Pocket Damper Seal High Pressure Rotordynamic Test Data
,”
ASME J. Eng. Gas Turbines Power
,
136
(
2
), p.
022501
.
13.
Cangioli
,
F.
,
Pennacchi
,
P.
,
Vannini
,
G.
,
Ciuchicchi
,
L.
,
Vania
,
A.
,
Chatterton
,
S.
, and
Dang
,
P. V.
,
2017
, “
On the Thermodynamic Process in the Bulk-Flow Model for the Estimation of the Dynamic Coefficients of Labyrinth Seals
,”
ASME J. Eng. Gas Turbines Power
,
140
(
3
), p.
032502
.
14.
Cangioli
,
F.
,
Chatterton
,
S.
,
Pennacchi
,
P.
,
Nettis
,
L.
, and
Ciuchicchi
,
L.
,
2018
, “
Thermo-Elasto Bulk-Flow Model for Labyrinth Seals in Steam Turbines
,”
Tribol. Int.
,
119
, pp.
359
371
.
15.
Cangioli
,
F.
,
Pennacchi
,
P.
,
Riboni
,
G.
,
Vannini
,
G.
,
Ciuchicchi
,
L.
,
Vania
,
A.
, and
Chatterton
,
S.
,
2017
, “
Sensitivity Analysis of the One-Control Volume Bulk-Flow Model for a 14 Teeth-on-Stator Straight-Through Labyrinth Seal
,”
ASME
Paper No.
GT2017-630.
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