Flame Stability Measurement on Rectangular Slot Meso-Scale Combustor

Abstract

The biggest problem of combustion in the micro-scale or meso-scale combustor is heat loss. Heat loss led to a difficult of stable flame. This research aims to elucidate the flame stabilization and flammability limit of LPG-oxygen premixed flame, temperature distribution and flame visualization. Flame stabilization and flammability limit map are shows in φ - U plane. The result shows that there are six regions in the map that is stable without noise, stable with noise, transition zone, dead zone, pseudo stable, and blow off. Measurement parameters are LPG-oxygen flow velocity at various equivalent ratio and temperature. The flame stabilization and flammability limit map within measurement parameters are discussed.

Performance of cylindrical and planar meso­scale combustor with double narrow slit flame holder for micropower generator

“…The role of the flame holder is also very important in the process of flame stabilization. Several types of flame holders have been tried, including porous media [20], wire mesh [21], backward-facing step [22], and slit [23][24][25]. Turbulent intensity on Micro-Combustor with Slits on both sides of the Bluff Body (MCSB) is greater thus it prolongs residence time and increases combustion efficiency and velocity extinction limit [24].…”

Development of planar meso­scale combustor with double narrow slit flame holder and various aspect ratios for micropower generator

“…It has been revealed from previous studies [15] that the use of pure oxygen produces a very high flame propagation speed, consequently the flame stability limit shifts to a rich mixture, this is due to the fact that the flame had a flashback at a low equivalent ratio. Improvement effort has been made to delay the occurrence of flashback by using a double narrow slit flame holder [16] which results showed that the flame stability limit can extend to the low equivalent ratio (lean mixture). However, the experiment was only carried out on the combustor with a single aspect ratio.…”