Experimental and Analytical Study of Flow Diversion Beyond an Underexpanded Nozzle

[+] Author and Article Information
E. C. Hansen

Mechanical Engineering, University of Florida, Gainesville, FL

J. Fluids Eng 113(3), 475-478 (Sep 01, 1991) (4 pages) doi:10.1115/1.2909520 History: Received June 13, 1990; Online May 23, 2008


A steady-state flow apparatus was used to investigate the process of gun gas diversion through a single hole perforated disk diverter. The amount of diverted flow was found to depend on the distance between the nozzle and the diverter disk and the ratio of nozzle pressure to diverter exit pressure. Experimental studies used nitrogen and carbon dioxide as the working fluids to show the effect of specific heat ratio. At ratios of nozzle pressure to ambient pressure ranging from 4 to 60 diversion efficiencies of 50 to 99 percent were produced. A one-dimensional analytic gas flow model was developed. Results of the analytic model paralleled the experimental data for pressure ratios over 10.

Copyright © 1991 by The American Society of Mechanical Engineers
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