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In this paper, the eddy dissipation model was used to predict the exact behavior of reacting flow in a round jet burner. The results were validated and verified with available experimental and numerical data. To this end, the turbulence and combustion equations were solved using the k-ε/EDM model and the PIMPLE algorithm by means of OpenFoam package. In addition, by modifying the reactingFoam solver, the thermal NO x  equations were solved, and the equations of the P-1 radiation model were used to solve the radiation equations. After validating the numerical method, the effects of H 2 O diluent injection rate and its location were studied on the temperature distribution and NO x  emission. The results revealed that as the injection rate of water vapor diluent increased, the temperature of the fluid decreased, and a decrease was observed in NO x  emissions in proportion to the temperature reduction. Increasing the diluent injection velocity had a negligible effect on the similarity distribution of temperature and NO x  mass fraction and the location of the maximum temperatures did not change much. The effects of diluent injection on reducing NO x  pollution were also seen upstream. As the diluent injection velocity increased, the effect of the diluent on the NO x  emission gradually were diminished.

Numerical investigation of the effect of water vapor diluent injection on the formation of NO x pollutants