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Liquid fuels differ from gaseous fuels by the amount of energy required to begin the
combustion reaction. This ‘ignition energy' is proportional to droplet size. Since a spark will
typically not be able to initiate a burn in a liquid fuel turbine, a torch ignitor is used instead.
The plot on the right shows how ignition energy changes with droplet size for a variety of
liquid fuels.
Combustion Reaction Flame Stabilization
If the reactions inside a combustor are much slower than the rate at which fuel and air are
moving through the combustion chamber, any flame that is initiated will be blown down
stream and the combustion reaction will cease. This is called blow-off. To prevent blow-off,
combustors are designed to re-circulate the combustion products in the primary zone thus
giving the combustion reaction time to complete and thereby stabilizing the flame.
Combustion instability can also lead to dangerous aerodynamic vibrations.
Training on Gas turbine Fundamentals by Sri Ajay Tripathi CM (Mech), GAIL, Pata on 23rd June 2009.
Material Compiled by: Mechanical Maint Dept GAIL Pata For discussion
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