Effect of ammonia addition to hydrocarbon fuels on thermal radiation of turbulent diffusion jet flame

To solve the environmental concerns and cleaner combustion, ammonia has been considered as a new fuel to blend into the traditional hydrocarbon fuels, which acts as a carbon-free hydrogen carrier. The evolution of flame emissivity, view factor and radiative heat flux have been investigated under different flow rates of ammonia and methane or propane, respectively. The experimental results indicate that the flame emissivity, view factor, and radiative heat flux decrease with increasing ammonia concentration. Some correlations have been developed for the flame emissivity, view factor, and radiative heat flux, which play as a function of flame height and flame width. It demonstrates a well predictive capability for the thermal radiation with different ammonia concentrations. These experimental results not only contribute to the fundamental understanding of thermal radiation model of ammonia-hydrocarbon mixed gas, but also useful for fire safety and the burner design for reducing the pollutant emissions.