TRAJECTORY AND POLLUTANT DISPERSAL OF BUOYANT HORIZONTAL HYDROCARBON FLAMES

摘要

This paper presents trajectory and pollutant dispersal of laminar and turbulent propane jet diffusion flames issued from horizontally-oriented circular and 4:1 aspect ratio elliptic burners in a quiescent environment. Both major and minor axes of the elliptic burner were aligned horizontally to study the effects of burner orientation on trajectory and emission characteristics. Propane jet velocity was varied to achieve different buoyant to momentum flux ratios. A circular hydrogen non-premixed pilot flame was employed for flame stabilization. Flame dimensions such as vertical and horizontal projections, length, and width were measured from the digital photographs of the flames. In-flame concentration and temperature profiles were measured at three axial locations of the flame to understand the pollutant dispersal. From flame photographs, correlations for flame trajectories were developed and compared with those available in literature. Results showed that projected height, trajectory length, and pollutant emissions of laminar flames were greatly influenced by buoyancy flux. Trajectory length and projected height increased with an increase in buoyancy flux. For turbulent flames, however, the burner geometry played a major role, although minor effects of buoyancy were seen at far-burner regions.