Accession Number:

ADA164354

Title:

Dynamic Response of Fluid Transmission Lines

Descriptive Note:

Master's thesis,

Corporate Author:

AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OH SCHOOL OF ENGINEERING

Personal Author(s):

Report Date:

1985-09-01

Pagination or Media Count:

171.0

Abstract:

The theoretical predictions of the dynamic response of circular cross section pneumatic transmission lines were compared with experimental results. Tests were conducted in blocked line situations as well as in both laminar and turbulent mean flow conditions. The lines used in the study were 24 in. in length with inside diameters of 0.041, 0.119, and 0.195 in. Tests were conducted over the frequency range 20 to 1000 Hz and over a range of mean flow Reynolds number from 0 to 16000. Theoretical solutions were obtained from computer simulations using a laminar flow model and two turbulent flow models. These models were developed from the Navier-Stokes equation and include components to account for viscosity and radial heat transfer in the fluid. An examination of the turbulent models was conducted based on a nondimensional frequency and attentuation. This led to modification of one of the turbulent models to include a frequency dependent term in the conductance. The effect of flow conditions upstream of the test line and the effect of orifice design on the dynamic response were studied. Experimental results showed good agreement with results of earlier studies. The use of a bypass device upstream of the test line was found to have no effect on line response. The reconfiguration of the orifice devices to more closely match theoretical models produced no noticeable change in the results.

Subject Categories:

  • Fluidics and Fluerics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE