Download PDFOpen PDF in browserThermal Characteristics of Biogas Flameless Combustion in Asymmetric Meso-scale CombustorEasyChair Preprint 69326 pages•Date: October 26, 2021AbstractThermal characteristics of non-premixed conventional flame and flameless mode at fixed fuel mass flow rate of biogas (60% CH4 + 40% CO2) in an asymmetric meso-scale vortex combustor with axial/tangential oxidizer inlet are investigated in this paper by solving three-dimensional governing equations. Realizable-k–e and the eddy-dissipation concept are used to simulate temperature distribution and combustion stability. The effect of tangential oxidizer inlet mass flow rate on the temperature distribution is also explored. The non-premixed meso-scale flameless combustion is much more stable compared to the non-premixed conventional flame. With a low of 10 % O2 concentration, the meso-scale flameless has higher temperature homogeneity throughout the combustor than flames with higher O2 concentration. The maximum temperature in meso-scale non-premixed conventional flame and flameless combustions were 1870 K and 1250 K respectively. The residence time inside the combustor is higher in flameless mode compared to the conventional flame. Keyphrases: Biogas, Flameless mode, Tangential air, meso-scale combustor, non-premixed
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