Masters Theses

Abstract

"A parametric investigation has been performed to study the effects of variations in design parameters and operating conditions on the dynamic tracking abilities of spiral grooved gas face seals. This analysis is limited to a mechanical seal in a flexibly mounted stator configuration. The quality of dynamic tracking is quantified by transmissibility ratios, which measure the stator’s ability at steady state to track the rotor in the presence of rotor runout and static stator misalignment. A semi-analytical approach has been used to obtain the seal transmissibility ratios in analytical form in terms of the gas film and support stiffness and damping properties. The linearized gas film properties are obtained using the perturbation method and are then reduced into closed form constitutive models by a curve-fitting algorithm. Stability of the seal has also been studied. Numerical simulations of the seal dynamics are carried out for all variations for validation purposes. The effects of variations of different design parameters (viz., pressure ratio, compressibility, dam ratio, land to groove width ratio, radius ratio, groove depth, spiral groove angle and number of grooves) on seal tracking and stability are discussed. Causes for instabilities are studied, and critical values are predicted. The results obtained from the semi-analytical approach and numerical simulations are in good agreement"--Abstract, page iv.

Advisor(s)

Miller, Brad A.

Committee Member(s)

Chandrashekhara, K.
Hering, Roger H.

Department(s)

Mechanical and Aerospace Engineering

Degree Name

M.S. in Mechanical Engineering

Comments

The authors would like to express their appreciation to the Missouri Research Board for their support of the current research.

Publisher

University of Missouri--Rolla

Publication Date

Fall 2003

Pagination

ix, 52 pages

Note about bibliography

Includes bibliographical references (page 24).

Rights

© 2003 Sivaramakrishnan Srinivasan, All rights reserved.

Document Type

Thesis - Restricted Access

File Type

text

Language

English

Subject Headings

Sealing (Technology)Parametric devices

Thesis Number

T 8436

Print OCLC #

56408288

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