Combustion of sustainable and renewable biohythane fuel in trapped vortex combustor

Biohythane fuel combustion in Trapped Vortex Combustor under high-speed conditions is presented in this paper. The main objective is to test the combustion performance and greenhouse gas emissions of sustainable and alternative fuels with high hydrogen content. Combustion modeling and simulation based on Reynolds Average Navier-Stokes method were used to study the interaction mechanisms between the chemical reaction and turbulent flow. The results show the effects of hydrogen to methane ratios (0–3); and heatign value (17.5–33 MJ/m3) at constant combustor power (P = 7.6 kW) on the flame temperature; the velocity field; the species concentrations; and the NOX and CO2 greenhouse gas emissions at the exit of the combustor. The numerical results show good agreement with those obtained experimentally. The numerical results show an increase of the flame temperature by 8.25% when methane is replaced with hydrogen fuel. For the biohythane fuel, an increase in the hydrogen content from 25% to 75% will increase the gas flame temperature by 0.6%–4.05%. The NOX emissions for the biohythane gas fuels are comparable to those obtained with methane fuel. In the other hand, substantial decrease in CO2 emissions for the biohythane fuel compared to methane gas fuel. Keywords: Combustion, Biohythane, Renewable fuel, Trapped vortex combustor, Computational fluid dynamics