Measurements Versus Predictions for the Dynamic Impedance of Annular Gas Seals—Part II: Smooth and Honeycomb Geometries
Author:
Dawson M. P.1, Childs D. W.2
Affiliation:
1. Pratt and Whitney, 400 Main Street, M/S 162-20, East Hartford, CT 06108 2. Turbomachinery Laboratory, Texas A&M University, College Station, TX 77843-3123
Abstract
Results are presented from tests conducted using an experimental test facility to measure the leakage and dynamic impedance of smooth and honeycomb straight-bore annular gas seals. The test seals had a 114.3 mm (4.500 in.) bore with a length-to-diameter ratio of 0.75 and a nominal radial clearance of 0.19 mm (0.0075 in.). The honeycomb cell depth for both seals was 3.10 mm (0.122 in.), and the cell width was 0.79 mm (0.031 in.). Dynamic impedance and leakage measurements are reported using air at three supply pressures out to 1.72 Mpa (250 psi), three speeds out to 20,200 rpm, and exit-to-inlet pressure ratios of 40% and 50%. Comparisons to the predictions from the two-control-volume model of Kleynhans and Childs [1] are of particular interest. This model predicts that honeycomb seals do not fit the conventional frequency independent model for smooth annular gas seals. The experimental results verify this new theory. Numerical predictions from a computer program incorporating the new two-control-volume model of Kleynhans and Childs [1] correlate well with both measured seal leakage and dynamic impedances for the honeycomb seals.
Publisher
ASME International
Subject
Mechanical Engineering,Energy Engineering and Power Technology,Aerospace Engineering,Fuel Technology,Nuclear Energy and Engineering
Reference7 articles.
1. Ha, T., and Childs, D., 1994, “Annular Honeycomb-Stator Turbulent Gas Seal Analysis Using New Friction-Factor Model Based on Flat Plate Tests,” ASME J. Tribol., 116, pp. 352–360. 2. Kleynhans, G., and Childs, D., 1997, “The Acoustic Influence of Cell Depth on the Rotordynamic Characteristics of Smooth-Rotor/Honeycomb-Stator Annular Gas Seals,” ASME J. Eng. Gas Turbines Power, 19, pp. 949–957. 3. Benckert, H., and Wachter, J., “Flow Induced Spring Coefficients of Labyrinth Seals for Application in Rotor Dynamics,” Rotordynamic Instability Problems in High-Performance Turbomachinery, Proceedings of a workshop held at Texas A&M University, May 12–14, NASA cp 2133, pp. 189–212. 4. Childs, D., Nelson, C., Nicks, C., Scharrer, J., Elrod, D., and Hale, K., 1986, “Theory Versus Experiment for the Rotordynamic Coefficients of Annular Gas Seals: Part 1—Test Facility and Apparatus,” ASME J. Tribol., 108, pp. 426–432. 5. Kleynhans, G., 1996, “A Two-Control-Volume Bulk-Flow Rotordynamic Analysis for Smooth-Rotor/Honeycomb-Stator Gas Annular Seals,” dissertation, Mechanical Engineering, Texas A&M University, pp. 55–57.
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