Investigations on a DBD burner: Corrected filtered rayleigh scattering by means of spontaneous raman scattering

A coaxial AC DBD burner has shown the ability to convert a nearly conical 1 L/min hydrogen diffusion flame to a near flat flame within 5 mm of the quartz dielectric burner surface by means of the body force generated from the electric field between the two electrodes. Filtered Rayleigh scattering on the cold fuel flow demonstrated this effect for different applied potentials, as the nominally axial hydrogen jet transitions to a radial jet with increasing voltage. Flame cases similarly reveal a widening of the flame base until a critical applied potential when the flame collapses on the quartz surface. For this atmospheric pressure, negligible velocity diffusion flame, the Rayleigh scattered signal is a coupled function of temperature and species concentration, prompting the use of spontaneous Raman scattering to measure relative species concentrations and thus allowing for corrections to the filtered Rayleigh scattering thermometry. Spontaneous Raman measurements alone assist in understanding the species-specific transport in this flame for intermediate applied potentials.