Optical tomography for diagnostics in combusting flows

Optical tomography was used for the diagnostics of the concentration field in a turbulent methane-air jet and laminar methane diffusion flame. Absorption measurements were made on methane using the 3.39 micron line of an He-Ne laser; mean concentration profiles were obtained in the turbulent jet at three axial positions. Comparisons with the results of previous studies for the axial and radial mean concentration profiles show excellent agreement. Absorption measurements of methane were also performed in a laminar diffusion flame at three axial positions within the reaction zone.