Case study for swirling flow and porous media on triple coaxial ports inverse diffusion flame

Abstract

In this study, the effects of swirling flow and porous media of triple coaxial ports inverse diffusion flame (TCP-IDF) on the flame shape, temperature and gas emissions are studied. In addition, a comparison between swirling and non-swirling TCP-IDF burner conducted using 5° air swirler. On the other hand, the effect of using a porous screen with 2 mm and 1 mm mesh size including 65°, 45° and 15° flow divergence diffuser on the flame radial and centerline temperatures, and emissions investigated. During all experiments, the air to fuel ratio was constant at 27. The results showed that using swirl reduce CO and UHC emissions and increase the peak temperature and NOx emissions of TCP-IDF. Also increasing the flow divergence angle, all of the CO, UHC, peak temperature and NOx emission decreasing. Concerning the increase in mesh size, it has been noticed that as the mesh size increased, NOx emissions increased while the CO, UHC and peak temperature decreased. Moreover, the combination between the swirl and 65° flow divergence diffuser recorded the lowest value of the CO and UHC emissions. While the combination between the swirl burner with 65° flow divergence diffuser and 1 mm porous screen produced the lowest peak temperature and NOx emissions.