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planar jet/flame facility

The planar jet facility is used in studies of heat release in nonpremixed flames, and simultaneous PIV/OH PLIF measurements, as well as in work on turbulent mixing. The photo shows a hydrogen diffusion flame, which is made luminous by the presence of seeded alumina particles. A green pulsed laser sheet from an Nd:YAG laser, used in planar laser scattering, is seen passing through the flame.

The above photo shows simultaneous particle image velocimetry (PIV) and planar laser-induced fluorescence of the OH radical (OH PLIF) measurements in progress. Two Nd:YAG lasers (green light), with pulses approximately 10 microseconds apart, are combined before being formed into a sheet and passed through the flame. Part of a Nd:YAG beam is extracted and used to pump a dye laser (right). The tunable light from the dye laser is sent through a frequency-doubler to create the UV light (fluoresced as blue) required for OH PLIF. The UV beam is then recombined with the Nd:Yag beams and sent through the flame. An intensified camera (center right) is used to image the UV fluorescence from OH, while a 2K x 2K CCD (center left) collects light scattered from seeded particles in the flame for the PIV measurement.



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