Mechanism of annular lean flame stabilization by air co-flow with combustible gas
Date Issued
2012
Date
2012
Author(s)
Ong, Pei-Sern
Abstract
In this present study, unstable annular methane-air premixed flame, of which the equivalence ratio is 0.85, has been tried to stabilize by different combustible outer co-flow. Methane and propane have been used as fuel in the outer annular premixed co-flow. The effects of combustible co-flow with respect to different combinations of injection velocities (Uout = 0.1-0.3 m/s) and fuel proportion on annular lean flame, are experimentally studied in a bluff-body multi-ring burner by flame image, flow path line, high speed Particle Image Velocimetry (frame rate = 1000 fps) and Chemiluminescene.
In the available literatures, dried air co-flow has been shown capable of stabilizing the unstable annular methane-air premixed flame with an injection velocity at least 0.33 m/s. The injection velocity of combustible co-flow was kept lower than 0.33 m/s so that the effect of fuel dilution (in the outer co-flow) on flame stabilization can be observed more conveniently.
Results show that propane-air premixed co-flow is more effective than methane-air on flame stabilization. Propane-air premixed co-flow can stabilize the unstable annular flame under all studied conditions; nevertheless, methane-air premixed co-flow merely achieves the same results at the flow rate of 0.3 L/min. On the contrary, the influences of outer co-flow velocities are less significant on the flame stabilization in all considered cases.
Subjects
PIV
Chemiluminescence
stratified combustion
flame stabilization
Type
thesis
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