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AIAA JOURNAL Vol. 40, No. 5, May 2002

Vol. 40, No. 5, May 2002
Numerical Modeling of Axisymmetric and Three-Dimensional
Flows in Microelectromechanical Systems Nozzles
Alina A. Alexeenko¤
and Deborah A. Levin
Pennsylvania State University, University Park, Pennsylvania 16802
Sergey F. Gimelshein
George Washington University, Washington, D.C. 20052
Robert J. Collins§
University of Minnesota, Minneapolis, Minnesota 55455
Brian D. Reed¶
NASA John H. Glenn Research Center at Lewis Field, Cleveland, Ohio 44125
A numerical study of three-dimensional effects on the performance of a micronozzle fabricated from at silicon
wafers is performed by use of both continuum and kinetic approaches. The nozzle operates in a low-Reynolds-
number regime, and viscous effects dominate the gas expansion. Thrust losses occur because the shear on the
wall is greater in a at nozzle con guration than in an axisymmetric conical nozzle. Therefore, the prediction of
the micronozzle performance based on axisymmetric or two-dimensional modeling can lead to signi cant design
errors. Comparisonof simulationwith recent datashows good agreement in terms of thrust predictions forcold-gas


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


Collections: Engineering