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AIAA JOURNAL Vol. 39, No. 8, August 2001

Vol. 39, No. 8, August 2001
Unsteady Flow Evolution in Porous Chamber with Surface Mass
Injection, Part 1: Free Oscillation
Sourabh Apte¤
and Vigor Yang
Pennsylvania State University, University Park, Pennsylvania 16802
Unsteady ow evolutionin a porouschamberwith surface massinjection simulatinga nozzleless rocket motorhas
been investigated numerically. The analysis is based on a large-eddy-simulation technique in which the spatially
ltered and Favre averaged conservation equations for large, energy-carrying turbulent structures are solved
explicitly. The effect of the unresolved scales is modeled semi-empirically by considering adequate dissipation
rates for the energy present in the resolved scale motions. The ow eld is basically governed by the balance
between the inertia force and pressure gradient, as opposed to viscous effects and pressure gradient corresponding
to channel ows without transpiration. It accelerates from zero at the head end and becomes supersonic in the
divergent section of the nozzle. Three successive regimes of development, laminar, transitional,and fully turbulent
ow, are observed. Transition to turbulence occurs away from the porous wall in the midsection of the motor, and
the peak in the turbulence intensity moves closer to the wall farther downstream as the local Reynolds number
increases. Increase in pseudoturbulence level at the injection surface causes early transition to turbulence. As the
ow develops farther downstream, the velocity pro le transits into the shape of a fully developed turbulent pipe
ow with surface transpiration. The compressibility effect also plays an important role, causing transition of the


Source: Apte, Sourabh V. - School of Mechanical, Industrial, and Manufacturing Engineering, Oregon State University
Yang, Vigor - School of Aerospace Engineering, Georgia Institute of Technology


Collections: Engineering