A numerical study of the structure of methane-hydrogen blended fuel turbulent jet flames

A numerical investigation is presented to delineate the effects of local mixing behavior on the stability of methane-hydrogen blended fuel flames. The turbulent mixing rate of nonreacting methane-hydrogen fuel blend was computed numerically. The Favre averaged Navier-Stokes equations were solved numerically and the local concentrations of hydrogen and hydrocarbon fuels were calculated for different inlet mixture conditions. The numerical prediction shows that with an increase of hydrogen concentration in the fuel mixture, the axial velocity decays faster while the axial turbulent fluctuations and the local turbulent flame speed increase. The significance of the local concentration in the flame stability mechanism is also presented.