Measured Comparison of Leakage and Rotordynamic Characteristics for a Slanted-Tooth and a Straight-Tooth Labyrinth Seal
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Measuredresults are presented to compare rotordynamic coefficients and leakage of a slanted-tooth labyrinth seal and a straight-tooth labyrinth seal. Both seals hadidentical pitch, depth, andnumber of teeth. Theteethinclination angle of the teeth on the slanted-tooth labyrinth was65° from the normal axis.Experiments were carried out at an inlet pressure of 70 bar-a (1015 psi-a), pressure ratiosof 0.4, 0.5, and 0.6, rotor speeds of 10.2, 15.35, and 20.2krpm, and a radial clearance of 0.2 mm (8 mils). One zero and twopositive inlet preswirl ratios were used. The results show only minute difference in the rotordynamic coefficients between the two seals. The slanted-tooth labyrinth seal consistently leaked approximately 10%lessat all conditions. Predictions were made using a one control volume bulk-flow model (1CVM) which was developed for a straight-tooth labyrinth seal design. 1CVMunder-predicted the rotordynamic coefficients and the leakage. Copyright © 2013 by ASME.
author list (cited authors)
Mehta, N. J., & Childs, D. W.