Effects of Wall Flexibility on the Rotordynamic Coefficients of Turbulent Cryogenic Annular Seals

[+] Author and Article Information
B. Venkataraman, A. B. Palazzolo

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

J. Tribol 118(3), 509-519 (Jul 01, 1996) (11 pages) doi:10.1115/1.2831567 History: Received January 31, 1995; Revised July 10, 1995; Online January 24, 2008


A theory for analyzing the effects of elastic deformations of the seal wall on the dynamic characteristics of high pressure cryogenic annular seals under concentric operation is presented. The bulk flow continuity, axial and circumferential momentum, and the energy transport equations are utilized to determine the pressure distribution in the seal. Thermophysical properties of the cryogenic fluid are assumed to be functions of the local pressure and temperature. The wall deformations are obtained using an iso-parametric, axi-symmetric Finite Element formulation of the seal wall. A perturbation analysis is employed to arrive at the first order solution which yields the rotordynamic coefficients. Results obtained for the case of Space Shuttle Main Engine Oxygen Turbopump (SSME-HPOTP) Preburner Seal show a significant impact of seal flexibility on the dynamic coefficients.

Copyright © 1996 by The American Society of Mechanical Engineers
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