Effect of Physical Properties of Porous Combustor on Radiant Output and Fuel-Preheated Efficiency of a Non-Sprayed Porous Burner

Abstract:

The effect of physical properties of porous combustor on performance of a non-sprayed porous burner (NSPB) in term of radiant output and fuel-preheated efficiency is studied through numerical modeling. The homogeneous combustion of vaporised kerosene and combustion air within a porous combustor (PC) is instead of the heterogeneous combustion occurs in free space of a conventional sprayed burner. The excellent fuel evaporation without atomisation is accomplished by using porous evaporator (PE). Single global reaction combustion, sub-cooled boiling, local non-thermal equilibrium between fluid and solid phases with phase change under complex radiative heat transfer and sub-cooled boiling are considered. The parametric study of porosity and optical thickness are investigated. The study shows that the radiant output efficiency is decreased with higher porosity while the fuel-preheated efficiency quite constant. The optical thickness has no significant effect on radiant output efficiency whereas the fuel-preheated efficiency is reduced with higher optical thickness. In addition, the evaporation front zone moves deep to downstream of PE when optical thickness increases.

• Periodical: Applied Mechanics and Materials (Volume 421)
• Pages: 819-825
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.421.819
• Online since: September 2013
• Authors: Kanokkarn Wongwatcharaphon, Kampanart Theinnoi
• Keywords: Combustion, Evaporation, Liquid Fuels, Non-Sprayed, Porous Medium

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