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TECHNICAL PAPERS

Dynamic Characteristics of the Diverging Taper Honeycomb-Stator Seal

[+] Author and Article Information
Anthony J. Smalley

Mechanical and Materials Engineering Division, Southwest Research Institute, P.O. Drawer 28510, San Antonio, TX 78228-0510tony@tonysmalleyconsulting.com

Massimo Camatti

Turbocompressors & Steam Turbines Division, Nuovo Pignone, Via Felice Matteucci, 2 Firenze, 50127 ItalyMassimo.camatti@np.ge.com

Dara W. Childs

Department of Mechanical Engineering, Turbomachinery Laboratory, Texas A&M University, College Station, TX 77843-3254dchilds@turbo-lab.tamu.edu

Justin R. Hollingsworth

Mechanical and Materials Engineering Division, Southwest Research Institute, P.O. Drawer 28510, San Antonio, TX 78228-0510jhollingsworth@swri.org

Giuseppe Vannini

Turbocompressors & Steam Turbines Division, Nuovo Pignone, Via Felice Matteucci, 2 Firenze, 50127 ItalyGiuseppe.vannini@np.ge.com

Jeremy J. Carter

Engine and Vehicle Research Division, Southwest Research Institute, P.O. Drawer 28510, San Antonio, TX 78228-0510jcarter@swri.org

J. Turbomach 128(4), 717-724 (Mar 01, 2004) (8 pages) doi:10.1115/1.2218891 History: Received October 01, 2003; Revised March 01, 2004

This paper introduces a variant on the honeycomb-stator seal, which can extend the already strong stabilizing influence of this seal geometry for centrifugal compressors. The paper presents predicted and measured dynamic characteristics, demonstrating how a clearance, which diverges axially from inlet to outlet, increases the maximum effective damping of a honeycomb-stator seal, even though the average clearance is increased. The results also show a strong negative direct stiffness at zero and low frequency for this seal geometry (termed the “diverging taper honeycomb seal (DTHCS)”). The predictions are made with ISOTSEAL , software developed at The Texas A&M Turbomachinery Laboratory. (This code was developed within the Turbomachinery Laboratory and is not a commercial product (not for sale).) The test data, also obtained at the Turbomachinery Laboratory, confirm the nature and magnitude of both these dynamic characteristics with close fidelity. However, measured leakage falls significantly below predicted leakage. The frequency dependence of the seal dynamic characteristics and the strong negative static stiffness require careful attention in rotor dynamics analysis.

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Copyright © 2006 by American Society of Mechanical Engineers
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References

Figures

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Figure 1

Side elevation of honeycomb-stator balance piston seal for large centrifugal compressor in propane refrigeration service

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Figure 2

Schematic comparison between straight and diverging taper honeycomb-stator seals

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Figure 3

Predicted effective damping of test configuration; diverging taper honeycomb-stator seal compared to a straight seal; 22,000rpm; 17bar upstream and 1bar downstream pressure Cin=0.1mm; Cout=0.21mm

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Figure 4

Predicted effective stiffness of test configuration; diverging taper honeycomb-stator seal compared to a straight seal; 22,000rpm; 17bar upstream and 1bar downstream pressure Cin=0.1mm; Cout=0.21mm

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Figure 5

Predicted damping of the test seal as a function of frequency for different cell depths; 22,000rpm; 17bar upstream and 1bar downstream pressure Cin=0.1mm; Cout=0.21mm

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Figure 6

TAMU turbomachinery lab air seal test rig

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Figure 7

Comparison of predicted (line) and measured (data points) characteristics for the DTHCS at 10,200rpm under 18.25bar supply pressure with high clearance

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Figure 8

Comparison of predicted (line) and measured (data points) characteristics for the DTHCS at 22,000rpm under 18.25bar supply pressure with high clearance

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Figure 9

Comparison of predicted (line) and measured (data points) characteristics for the DTCHS at 10,200rpm under 7.083bar supply pressure with low clearance

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Figure 10

Comparison of predicted (line) and measured (data points) characteristics for the DTHCS at 17,000rpm under 7.239bar supply pressure with low clearance

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Figure 11

Comparison of predicted log decrement for various configurations of balance piston seal in target propane compressor

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