Honeycomb damper seals with convergent-tapered clearance have been proposed to improve static and dynamic characteristics of liquid annular seals employed in pumps. Their characteristics are experimentally investigated and compared to those for a conventional straight (no taper) annular seal with smooth surface and a straight damper seal with identical honeycomb pattern in seal stator. Three convergent-tapered honeycomb damper seals are used in the test, and have different inlet clearance (maximum clearance) and almost the same outlet clearance (minimum clearance). Their outlet clearance is almost the same as the clearance of the straight smooth seal and is slightly smaller than the clearance of the straight damper seal. Experimental results show that the convergent-tapered damper seals as well as the straight damper seal have lower leakage flow rate and cross-coupled stiffness coefficients, and larger main damping coefficients than the straight smooth seal, resulting in larger effective damping coefficients. These results are mainly due to surface roughness in the seal stator such as a honeycomb pattern used in the present analysis. The convergent-tapered damper seals also have larger main stiffness coefficients than the straight smooth and damper seals, which is mainly due to the convergent-tapered clearance and yields larger radial reaction force for a small concentric whirling motion. Consequently, the convergent-tapered damper seals have better seal characteristics than the conventional straight smooth seal and the straight damper seal with the same roughness pattern from the viewpoints of decreasing the leakage and improving the rotor stability capacity.

Issue Section:
Technical Papers
Keywords:
seals (stoppers), pumps, flow measurement, elasticity, damping, geometry, dynamic response, rough surfaces
Topics:
Clearances (Engineering), Dampers, Damping, Honeycomb structures, Leakage flows, Pressure, Rotors, Spin (Aerodynamics), Spinning (Textile), Stators, Stiffness, Surface roughness, Whirls, Fluids, Pumps
1.
Von Pragenau, G. L., 1982, “Damping Seals for Turbomachinery,” NASA Technical Paper 1987.
2.
Childs
,
D. W.
, and
Kim
,
C-H.
,
1985
, “
Analysis and Testing for Rotordynamic Coefficients of Turbulent Annular Seals with Different, Directionally Homogeneous Surface Roughness Treatment for Rotor and Stator Elements
,”
ASME J. Tribol.
,
107
, pp.
296
–
306
.
3.
Childs
,
D. W.
, and
Kim
,
C-H.
,
1986
, “
Test Results for Round-Hole-Pattern Damper Seals: Optimum Configurations and Dimensions for Maximum Net Damping
,”
ASME J. Tribol.
,
108
, pp.
605
–
611
.
4.
Childs
,
D. W.
, and
Garcia
,
F.
,
1987
, “
Test Results for Sawtooth-Pattern Damper Seals: Leakage and Rotordynamic Coefficients
,”
ASME J. Tribol.
,
109
, pp.
124
–
128
.
5.
Childs
,
D. W.
,
Nolan
,
S. A.
, and
Kilgore
,
J. J.
,
1990
, “
Additional Test Results for Round-Hole-Pattern Damper Seals: Leakage, Friction Factors, and Rotordynamic Force Coefficients
,”
ASME J. Tribol.
,
112
, pp.
365
–
371
.
6.
Iwatsubo, T., and Sheng, B., 1990, “An Experimental Study on the Static and Dynamic Characteristics of Damper Seals,” Proceedings of the Third IFToMM International Conference on Rotordynamics, Lyons, France, pp. 307–312.
7.
Childs
,
D. W.
, and
Fayolle
,
P.
,
1999
, “
Test Results for Liquid “Damper” Seals Using a Round-Hole Roughness Pattern for the Stators
,”
ASME J. Tribol.
,
121
, pp.
42
–
49
.
8.
Childs, D. W., 1984, “Finite-Length Solutions for the Rotordynamic Coefficients of Constant-Clearance and Convergent-Tapered Annular Seals,” Proc. Inst. Mech. Eng., Paper C276/84, pp. 223–231.
9.
Childs
,
D. W.
, and
Dressman
,
J. B.
,
1985
, “
Convergent-Tapered Annular Seals: Analysis and Testing for Rotordynamic Coefficients
,”
ASME J. Tribol.
,
107
, pp.
307
–
317
.
10.
Simon
,
F.
, and
Fre^ne
,
J.
,
1989
, “
Static and Dynamic Characteristics of Turbulent Annular Eccentric Seals: Effect of Convergent-Tapered Geometry and Variable Fluid Properties
,”
ASME J. Tribol.
,
111
, pp.
378
–
384
.
11.
Scharrer
,
J. K.
, and
Nelson
,
C. C.
,
1991
, “
Rotordynamic Coefficients for Partially Tapered Annular Seals: Part I—Incompressible Flow
,”
ASME J. Tribol.
,
113
, pp.
48
–
52
.
12.
Lindsey
,
W. T.
, and
Childs
,
D. W.
,
2000
, “
The Effects of Converging and Diverging Axial Taper on the Rotordynamic Coefficients of Liquid Annular Pressure Seals: Theory Versus Experiment
,”
ASME J. Vibr. Acoust.
,
122
, pp.
126
–
131
.
13.
Childs
,
D.
,
Elrod
,
D.
, and
Hale
,
K.
,
1989
, “
Annular Honeycomb Seals: Test Results for Leakage and Rotordynamic Coefficients; Comparisons to Labyrinth and Smooth Configurations
,”
ASME J. Tribol.
,
111
, pp.
293
–
301
.
14.
Yu.
,
Z.
, and
Childs
,
D. W.
,
1998
, “
A Comparison of Experimental Rotordynamic Coefficients and Leakage Characteristics Between Hole-Pattern Gas Damper Seals and a Honeycomb Seal
,”
ASME J. Tribol.
,
120
, pp.
778
–
783
.
15.
Darden, J. M., Earhart, E. M., and Flowers, G. T., 2001, “Influence of Seal Geometry on the Rotordynamic Characteristics of a Round-Hole Pattern Damping Seal,” Proceedings of the 2001 ASME Vibration Conference, DETC2001/VIB-21635.
16.
Kaneko
,
S.
,
Kamei
,
H.
,
Yanagisawa
,
Y.
, and
Kawahara
,
H.
,
1998
, “
Experimental Study on Static and Dynamic Characteristics of Annular Plain Seals With Porous Materials
,”
ASME J. Tribol.
,
120
, pp.
165
–
172
.
17.
Measurement Uncertainty, ANSI/ASME PTC 19.1-1985 Part 1, 1986 (reaffirmed 1990).
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