Study of electrostatic modulation of fuel sprays to enhance combustion performance in an aviation gas turbine.
studyofelectrost00mann.pdf (5.276Mb)Abstract
The influence of electrostatic and electrohydrodynamic
charging on hydrocarbon fuel spray patterns and droplet
atomization has been investigated. Research was performed
in a combustion environment with an Allison T-56 combustor
liner and an unmodified pressure- jet atomizer fuel nozzle.
High-voltage probes and a variable-geometry probe insertion
device were developed to assess the effectiveness of probe
type and location on fuel spray modification and modulation.
Exhaust gas temperatures and temperature profiles were
measured to determine changes in the combustor ' s thermal
profile and combustion efficiency. JP-4, JET-A and Number-2
Diesel fuels were tested to analyze electrically-assisted
atomization effectiveness relative to off-design fuel
performance. Net temperature increases were recorded for
all fuels, yielding combustion efficiency improvements of
1.18, 1.10 and 0.68 percent for DF-2, JET-A and JP-4
respectively. Observations indicate electrical charging
effectiveness, in terms of thermal power output per unit of
electrical power input, increases in the order of JP-4, JETA
and DF-2, suggesting a direct correlation with the surface
tension of the fuels.
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