Experimental Study of Thermal Flow Structure in an Innovative Burner with Cap-induced Premixing Combustion
Date Issued
2010
Date
2010
Author(s)
Fang, Er-Kai
Abstract
The wake of bluff-body combustor and cap combustor in the reaction flow are investigated. To understand flame reaction zone, Particle Image Velocimetry (PIV) and Chemiluminscence methods are utilized to detect flow pattern and the local inten-sity of light. Besides, the distribution of temperature is established by thermocouple.
In the Bluff-body burner, flame structures which are dominated by the air veloc-ity and the central fuel jet are classified into three modes: recirculation flame, jet-dominated flame, and jet-like flame. In the cap combustor, the air velocity is fixed at 0.45m/s and the central jet are at 0.53, 1.73 and 8.8m/s. The result reveals that the heat release leads to buoyancy effect and induce the fluid to accelerate. The position of flame is dependent on the flow flied. Once the fuel jet has been increased, the recirculation zone will be decreased. The sparking position is motivated by the loca-tion of separation flow.
The distribution of temperature shows that the recirculation zone will provide heat source for downstream and the flammable limit figure conclude that the cap combustor will improve flammable range in the high velocity of fuel jet. Most im-portantly, Chemiluminscence and PIV enable us to fully describe the dynamic beha-viors between flame and flow instantly.
Subjects
Bluff-Body Combustor
Particle Image Velocimetry
Chemiluminscence
Cap Combustor
Type
thesis
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