|
Afterburners or augmentation devices were added to aircraft gas
turbine engines to increase their thrust during take-off or
periods of acceleration. There are two important problems in
the operative period of afterburner , i.e. flame
stabilization and relight. Flame stabilization is usually
achieved in the wake of a bluff body ,e.g.v-gutter placed in
the gas stream. In addition to flame stabilization problem
,ignition is usually harder to achieve. A pilot burner is one
of the methods to slove this hard work. The present thesis
investigates,using experimental approach ,the ignition behavior
, extinction phenomena,flame structure and temperature
distribustion in the downstream of pilot burner. Two
different pilot burners which are with and with- out swirl
vans inside in a combustion tunnel. According to
experimental results we can conclude that (a)turbulent mixing
is stronger in the flow of pilot burner with swirl vans than
without swirl vans , (b) the flame structure of pilot burner
is dependent on pilot burner's geometric structure , (c) the
ignition behavior of pilot burner depends on temperature
distribution in the downstream of pilot burner and on average
velocity of air flow.(d) pilot burner is a dominant mechanism
in the combustion flow field of pilot burner combined with v-
gutter .
|