Reacting Experiments
Reacting experiments in the Stanford facility comprise the Ph.D. thesis of
Michael F. Miller (1994). In this work, Miller used simultaneous planar laser-
induced fluorescence (PLIF) of seeded acetone vapor and the naturally occurring
OH radical to mark regions of unburned fuel and regions of combustion,
respectively. These two species were excited by the same 285 nm laser pulse,
but produce spectrally separated fluorescence. Thus only one laser was
needed, while the fluorescence signals from the two species were recorded on
separate cameras, discriminated from one another by optical filters.
![[FLUORESCENCE]](ohace.gif)
The image
set above was acquired from a single laser pulse; flow is from left to right,
and the supersonic stream is on top. The acetone image, false-
colored purple, shows the variation in fuel concentration between the low-
speed free stream and the mixing layer. The OH image, in yellow,
reveals the regions of high OH concentration, associated with the reaction in
the mixing layer. The composite image on the bottom shows how the structural
features revealed by each species interrelate.
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