A Study on Influence of Dilution Gas on Burning Velocity of Ultra-Lean Hydrogen added Propane Premixed Meso-scale Spherical Laminar Flames

Abstract

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.