The present study is concerned with measuring and simulating soot and flame structure of non-premixed gas fired swirl stabilized combustor. Filter paper technique is used to measure soot volume fraction inside the combustor. The numerical simulation is based on the solution of the fully-coupled conservation equations for swirling turbulent flow, chemical species kinetic modeling, fuel combustion and soot formation and oxidation. The soot particle number density and the mass density based on the acetylene concentrations are used to model the soot emission in confined swirling turbulent diffusion flame. The comparison between predictions and measurements over a range of different swirl numbers shows good agreement. The results reveal the significant influence of swirl intensity on combustion characteristics and soot concentration in diffusion flames. The results show that an increase in swirl number enhances the mixing rate, peak temperature, and soot volume fraction inside the flame zone. The locations of the maximum temperature and soot concentration shift closer to the combustor inlet with increase in swirl number.

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