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JOURNAL OF PROPULSION AND POWER Vol. 19, No. 4, JulyAugust 2003

Vol. 19, No. 4, July­August 2003
Measurements and Simulation of Ori ce Flow
for Micropropulsion Testing
A. A. Alexeenko,¤
S. F. Gimelshein,
and D. A. Levin
Pennsylvania State University, University Park, Pennsylvania 16802
A. D. Ketsdever§
U.S. Air Force Research Laboratory, Edwards Air Force Base, California 93524
M. S. Ivanov¶
Institute of Theoretical and Applied Mechanics, 630090, Novosibirsk, Russia
Numerical and experimental results for a rare ed gas expansion through a thin circular ori ce are presented.
The ori ce ow was used as a calibrationtest fora torsionalthrust stand designed to measureforce levels from 10¡6
to 10¡3 N. Molecular nitrogen, argon, and helium at room temperature are used as test gases. The mass ux and
thrust measurements are compared with the direct simulation Monte Carlo results for Knudsen numbers from 40
to 0.01and plenum to facility backgroundpressure ratios of 103 ¡107. Factors that affect the totalpropulsiveforce,
such as jet back ow and facility background gas penetrating the jet, are analyzed. The measured and calculated
mass ux and total propulsive force were found to agree well for Knudsen numbers less than 1.


Source: Alexeenko, Alina - School of Aeronautics and Astronautics, Purdue University


Collections: Engineering