Ethylene Flame Holding
The parameter space over which an ethylene flame can be held behind a rearward facing step
in a M=1.6 flow is investigated. The parameters that were varied included tunnel stagnation
temperature (300-800K), pressure and ethylene flow rate. Two spark igniters just
downstream of the step were used to attempt reignition after the flame was lost, establishing
boundaries for flame holding and re-ignition conditions. Over the years, a large number of
injection configurations, hydrogen pilot flames and combustor geometries have been tested -
some of this research is outlined here.
14MB MPEG movie file showing combustor emission as recorded by auto-exposure correcting DV camera during ethylene
combustion at a M=1.6, T0=700K air. The flow is frol right to left and the rearward facing step, where the
flow path expands from 1" to 2" width, is at the right end of the window shown.
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