University of Illinois Urbana-Champaign

Analysis of transient wave motion in liquid filled cylinders

Holt, Charles F.

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https://hdl.handle.net/2142/112091

Description

Title
Analysis of transient wave motion in liquid filled cylinders
Author(s)
Holt, Charles F.
Issue Date
1972-10
Keyword(s)
Transient Wave Motion
Abstract
An analytical model is presented representing the unsteady compressible flow within a circular cylinder. Special initial and boundary conditions make the problem applicable to positive displacement fluid pumps operating at high pressure and high rotational speed. The governing equations are solved on an IBM 360/75 computer via the method of characteristics. The analysis provides information on the transient pressure and velocity fluctuations within the cylinder which is terminated at one end by a moving piston and at the other end by an orifice having a time varying diameter. The transient flow through the orifice plays a dominant role in characterizing the flow conditions within the cylinder and is analyzed via a numerical integration of the unsteady Bernoulli equation. Various parameters and flow conditions are investigated as to their effect on transient fluctuations within the cylinder. These include changes in cross sectional area in the cylinder and in the discharge line, changes in the port plate geometry (affecting the rate at which the cylinder is exposed to pressure exterior to the pump), temperature of the working fluid, various aspects of the transient orifice flow, precompression and preexpansion. The calculations presented indicate that under certain conditions significant reduction in the transient pressure oscillations may be achieved. This report is based on a thesis of the same title presented by the author in partial requirements for the degree of Doctor of Philosophy in Theoretical and Applied Mechanics in the Graduate College of the University of Illinois at Urbana-Champaign, 1972.
Publisher
Department of Theoretical and Applied Mechanics. College of Engineering. University of Illinois at Urbana-Champaign
Series/Report Name or Number
  • TAM R 363
  • 1972-6011
ISSN
0073-5264
Type of Resource
text
Language
eng
Permalink
http://hdl.handle.net/2142/112091
Sponsor(s)/Grant Number(s)
Sundstrand Aviation Division of Sundstrand Corporation, Rockford, Illinois, 72/10
Copyright and License Information
Copyright 1972 Board of Trustees of the University of Illinois

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Technical Reports - Theoretical and Applied Mechanics (TAM) PRIMARY
TAM technical reports include manuscripts intended for publication, theses judged to have general interest, notes prepared for short courses, symposia compiled from outstanding undergraduate projects, and reports prepared for research-sponsoring agencies.