Burning and Extinction Characteristics of Methanol Fed Porous Sphere Flames Under Carbon-Dioxide Enriched Air
V. Avinash1, Shintre Parag2 and Vasudevan Raghavan2,a
1NIT Trichy, Tiruchirappalli 620 015, Tamilnadu, India.
2IIT Madras, Chennai 600036, Tamilnadu, India.
araghavan@iitm.ac.in
ABSTRACT
Investigation of combustion characteristics of diffusion flames from methanol fed porous spheres under mixed convective environment of carbon-dioxide enriched air stream is presented. In a porous sphere experimental setup, the composition of oxidizer has been varied from that of a pure air to a mixture containing various volumetric proportions of carbon-dioxide. Addition of carbon-dioxide is carried out in such a manner that the mole fraction of oxygen varies in one of the three ways; it decreases or it remains constant or it increases. For the variations in sphere sizes, oxidizer flow rates and oxidizer compositions, the fuel burning rates are measured and are presented in detail. The critical velocities, at which flame extinction occurs in the front portion of the sphere, are also reported. Theoretical analysis to support the experimental results is also provided. This study reveals the radiation absorption characteristics of carbon-dioxide and its fire suppressant properties under different combustion conditions.
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