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RESEARCH
AREAS
TRAPPED
VORTEX COMBUSTORS
| The performance
of a liquid-fueled trapped vortex (TV) combustor is analyzed
both experimentally and computationally. The TV cavity, formed
between a forebody and an afterbody, is placed coaxially inside
a combustor shell. Fuel and primary air are injected from the
inside face of the afterbody. The flame holding capability of
this trapped vortex configuration is evaluated for different
primary equivalence ratios. Very low overall lean-blow-out (LBO)
equivalence ratios are obtained for the TV combustor over a
wide range of annular and primary airflow rates. It is found
that by injecting the primary air with a tangential velocity
component the circumferential mixing is improved without disrupting
the vortex trapped in the cavity. The performance of the TV
combustor is also evaluated through emissions measurements at
the exit of the combustor and temperature distribution inside
the cavity. Numerical simulations are performed using LES and
also RANS with a k-e turbulence model coupled with a PDF combustion
chemistry model for simulating liquid spray combustion. The
predicted results are in reasonable agreement with the measurements
and provide an assessment of the flow distribution in the cavity
region. This work is supported by AFOSR-LEQSF. |
Velocity
and temperature distributions in a Trapped Vortex Combustor
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