Accession Number:

ADA445960

Title:

Experimental and Numerical Modeling of Rarefied Gas Flows Through Orifices and Short Tubes

Descriptive Note:

Conference paper

Corporate Author:

UNIVERSITY OF SOUTHERN CALIFORNIA LOS ANGELES

Report Date:

2005-07-13

Pagination or Media Count:

8.0

Abstract:

Flow through circular orifices with thickness-to-diameter ratios varying from 0.015 to 1.2 is studied experimentally and numerically with kinetic and continuum approaches. Helium and nitrogen gases are used in the range of Reynolds numbers from 0.02 to over 700. Good agreement between experimental and numerical results is observed for mass flow and thrust corrected for the experimental facility background pressure. For thick-to-thin orifice ratios of mass flow and thrust vs pressure, a minimum is established. The thick orifice propulsion efficiency is much higher than that of a thin orifice. The effects of edge roundness and surface specularity on a thick orifice specific impulse were found to be relatively small.

Subject Categories:

  • Fluid Mechanics
  • Combustion and Ignition

Distribution Statement:

APPROVED FOR PUBLIC RELEASE