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RESEARCH PAPERS

Annular Honeycomb-Stator Turbulent Gas Seal Analysis Using a New Friction-Factor Model Based on Flat Plate Tests

[+] Author and Article Information
T. W. Ha, D. W. Childs

Turbomachinery Laboratory, Mechanical Engineering Department, Texas A&M University, College Station, TX 77843

J. Tribol 116(2), 352-359 (Apr 01, 1994) (8 pages) doi:10.1115/1.2927233 History: Received January 11, 1993; Revised August 09, 1993; Online June 05, 2008

Abstract

A new empirical friction-factor model for honeycomb surfaces based on flat plate test results has been developed as a function of Mach number and dimensionless pressure and honeycomb geometry variables. A rotordynamic analysis for centered, turbulent-annular-honeycomb-stator seals has been developed incorporating the new empirical friction-factor model for honeycomb-stator surfaces. The results of the new analysis in predicting the rotordynamic and leakage characteristics have been compared to: (a) Moody’s friction-factor model analysis, and (b) experimental data for short (L/D = 1/6, 25.4 mm long) seal. The comparisons show that the new honeycomb friction-factor model greatly improves the predictions of leakage and rotordynamic coefficients compared to Moody’s friction-factor model, especially, for direct and cross-coupled stiffness.

Copyright © 1994 by The American Society of Mechanical Engineers
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