Improvement in flame stability of diffusion flame using a bluff-body swirling jet combustor

Abstract

Paper presented at the 9th International Conference on Heat Transfer, Fluid Mechanics and Thermodynamics, Malta, 16-18 July, 2012.

Based on past research, the flame stability of various combustion areas is being debated. However, the mechanism of flame stabilization is not yet fully understood, nor is there any systematic research being done into flame stabilization. Especially lacking is any research regarding hybrid combustion areas where swirl flow has been added to flames formed in bluff body type combustors. As a result of this knowledge regarding flame stability is sparse. With this research, an investigation has been carried out into the temperature fields, flow fields, and the flame characteristics formed in currently available bluff body combustors that have been induced with swirl flows and who’s annular has been attached with a swirler. Also looked at is flame stability. In this study measurements were carried out on the special characteristics of flames in the case of a swirl flow being added to a diffusion flame using a bluff body combustor. Also measured were the flow fields and temperature fields; flame stability also being examined. The results are as follows. By conferring a swirl flow to a bluff body combustor, there was an improvement in flame stability. And In the flames formed by a bluff body combustor, the often observed hysteresis phenomenon could not be seen when a swirl flow was added. Addition, The improvement in stability achieved by adding a swirl flow to the combustion field is thought to be achieved by the air flow being extended to the radial by centrifugal force, causing near the flame surface, the formation of a velocity which balances a temperature field that maintains a high temperature range and combustion velocity.