IN-SITU MEASUREMENT OF NITRIC-OXIDE IN TU RBULENT-DIFFUSION FLAMES

Spectroscopic diagnostic methods such as laser-induced fluorescence (L IF) and spontaneous Raman scattering are combined to perform point mea surement of nitric oxide, hydroxyl, major species concentrations, and temperature in a turbulent hydrogen-air diffusion flame. The experimen tal procedure is presented and a brief introduction to the modeling an d numerical calculation of the turbulent combustion system is given. T he assumption of chemical equilibrium for the calculation of nitric ox ide and hydroxyl concentrations is found to be insufficient. The intro duction of the progress variable leads to a significant improvement in prediction abilities of the model.