This research advances the use of 3-D LES to simulate the mixing of fuel with air. LES predictions, including the mean and RMS of the fuel concentration are compared to measurements of the mean and RMS of fuel concentration. These time resolved measurements are tomographically reconstructed from time resolved LOS laser absorption measurements. The measurements were made at several locations downstream of where a central round pipe discharged fuel into a surrounding co-flow of air.

The LES model predicts the extent of mixing quite well.

A novel aspect of this research is the use of tomography to generate not only the mean concentration, but also the RMS of concentration. A genetic-algorithm was developed for this reconstruction.

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