The Effects of Fixed Rotor Tilt on the Rotordynamic Coefficients of Incompressible Flow Annular Seals

[+] Author and Article Information
J. K. Scharrer, N. Rubin

Rockwell International, Rocketdyne Division, Canoga Park, Calif. 91304

C. C. Nelson

Texas A&M University, College Station, Texas 77843

J. Tribol 115(3), 336-340 (Jul 01, 1993) (5 pages) doi:10.1115/1.2921640 History: Received December 13, 1990; Revised May 01, 1991; Online June 05, 2008


The basic equations are derived for incompressible flow in an annular seal with large rotor tilt. The flow is assumed to be completely turbulent in the axial and circumferential directions with no separation, and is modeled by Moody’s friction factor equation. Linearized zeroth and first-order perturbation equations are developed for small motion about an arbitrary position by an expansion in the eccentricity ratio. The zeroth-order continuity and momentum equations are solved using a Fast Fourier technique, yielding the axial and circumferential velocity components and the pressure distribution. The first-order equations are integrated to satisfy the boundary conditions and yield the perturbation pressure distribution. This resultant pressure distribution is integrated along and around the seal to yield the force developed by the seal and the corresponding dynamic coefficients. Results of a parametric study show that the detrimental effects of a tilted rotor are small.

Copyright © 1993 by The American Society of Mechanical Engineers
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