A Severe Bouyancy Problem Analysis And Solution Using CFD
Author(s)
M. Egoavil, R. Puster
Abstract
A severe buoyancy problem analysis and
solution using CFD
Marco Egoavil, Richard Puster
NASA Langley Research Center - USA
Abstract
The 8-Foot High-Temperature Tunnel (8-FT HTT) at the NASA Langley
Research Center is a unique world class facility with a wide range of working
parameters. New airfoil-shaped fuel injectors and an ignitor are being designed to
minimize the effects of the buoyancy in the tunnel. Buoyancy in combustion
chambers may seem to be a second order problem, but this is not true if large
density gradients or differences are present at high pressure, as happens in the
combustion chamber of the 8-FT HTT. The problem arises because not all of the
enriched air at 410°R to 470°R is reacted and has a density that is almost 9 times
that of the reaction products. The cold, dense surrounding fluid falls to the
bottom of the chamber while the hot, low density reaction products tend to
segregate to the top of the chamber, resulting in overheating of the li
Keywords
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