The current work presents computational investigations of combustion characteristics of biogas-hydrogen blends for various thermo-physical conditions relevant for practical combustor applications.The numerical simulations were performed using 0-D SENKIN and 1-D PREMIX codes, whereas chemical kinetics is modelled using the GRI Mech 3.0 mechanism. Biogas composition represented by 60CH_4/40CO_2 (v/v) is blended with different H_2 concentrations varying from 0 to 50 (v/v) in the fuel. The effect of initial temperature and pressure on ignition delay, laminar flame speed (S_u), flame temperature (T_(ad)), species concentrations (C_i), and heat release rate profiles is investigated. The results showed that GRI-Mech 3.0 predictions are in good agreement with the available experimental ignition delay data for CH_4/CO_2-air mixture for stoichiometric ambient condition. Furthermore, the sensitivity analysis was studied to assess the influence of hydrogen added to the biogas using sensitivity coefficient of laminar flame speed. The understanding of combustion characteristics of these mixtures at given initial conditions leading to feasibility conformity of optimal blends of biogas/hydrogen mixtures for the design improvement of practical combustors is discussed.
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