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RESEARCH PAPERS

Experimental Study of Through-Flowing Pneumatic Lines

[+] Author and Article Information
P. A. Orner

Systems Engineering Division, Case Western Reserve University, Cleveland, Ohio

W. C. Cooley

Autonetics Division, North American Rockwell Corp., Anaheim, Calif.

J. Basic Eng 92(4), 849-856 (Dec 01, 1970) (8 pages) doi:10.1115/1.3425156 History: Received February 11, 1970; Online October 27, 2010

Abstract

The complete linear two-port admittance parameters of a short uniform pneumatic line are experimentally determined as functions of driving frequency and the steady through-flow in the line. The measured through-flow influence (c.f. the driving point admittance increase) is found to be much greater than that predicted by known one-dimensional acoustic models (frequency dependent phase velocity and attenuation factor) with mean velocity Doppler shift correction. More satisfactory agreement is found with a model which considers the first-order effects of the through-flow velocity profile. High-frequency (up to 2500 Hz) laminar dynamic flow and pressure data is presented for lines on the order of 6 in. long and 1/8 in. ID, with Mach numbers from zero to 0.16. The experimental aspects of quantitative dynamic flow measurement with a hot-wire anemometer are discussed in detail. Details and calibration of the high-frequency line flow and pressure probes, and the low Reynolds number—high Mach number flow test setup are presented.

Copyright © 1970 by ASME
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