Laminar combustion characteristics of premixed propane/hydrogen/air flames

An experimental study on laminar burning characteristics of the spherically expanding premixed propane-hydrogen-air flames was conducted at room temperature and atmospheric pressure. The unstretched laminar burning velocity, the Markstein number, the Zeldovich number and the global Lewis number were obtained. The results show that the unstretched laminar burning velocity increases, the laminar flame thickness decreases with the increase of hydrogen fraction. When hydrogen fraction in the fuel is less than 60%, the Markstein number decreases with the increase of the equivalence ratio. At equivalence ratio less than 1.2, the Markstein number decreases with the increase of hydrogen fraction. In the case of lean mixture combustion, the Zeldovich number decreases with the increase of hydrogen addition. The global Lewis number decreases with the increase of hydrogen fraction.