| Paper description |
Flame propagation of premixed natural gas–hydrogen–air mixtures was studied in a
constant volume combustion bomb. Laminar burning velocities and mass burning fluxes
were obtained under various hydrogen fractions and equivalence ratios with various initial pressures, while flame stability and their influencing factors (Markstein length, density ratio and flame thickness) were obtained by analyzing the flame images at various hydrogen fractions, initial pressures and equivalence ratios. The results show that
hydrogen fraction, initial pressure as well as equivalence ratio have combined influence
on both unstretched laminar burning velocity and flame instability. Meanwhile, according
to flame propagation pictures taken by the high speed camera, flame stability decreases with the increase of initial pressures; for given equivalence ratio and hydrogen fraction, flame thickness is more sensitive to the variation of the initial pressure than to that of the density ratio |
(创新港)
