超希薄水素－プロパン混合気の微小球状層流火炎の燃焼特性に与える希釈ガスの影響に関する研究

抄録

This study is performed to examine experimentally the influence of dilution gas addition on the burning velocity of ultra-lean hydrogen added propane air premixed meso-scale spherical laminar flames, whose equivalence ratio φ is 0.5 and hydrogen additional rate δ_H is 0.8. N₂ and CO₂, dilution gas, are adopted as simulated EGR gas. The flame radius rf and the burning velocity S_Ll of meso-scale flames in the range of r_f approximately from 1 to 5 mm are obtained by using sequential schlieren images recorded under appropriate ignition conditions. It was found that S_Ll normalized by the laminar burning velocity at the same r_f tends to increase with a simulated EGR gas additional rate.