Flow Pattern, Mixing Fields and Ignition Stability fo Industrial Type Turbulent Swirling Flames

摘要

An experimental study of flame stabilization in confined natural gas swirling flames has been performed in the heat release range 75-250 kW. The primary objective was to explain the blow-off mechanism for enclosed swirling flames using detailed in-flame measureemnts. The main conclusion is that flame stability depends on the gas residence time in the ignition zone. Higher inlet velocities lead to delayed heat release, combined with lower thermal feed into the inner recirculation zone. That causes a lower heat input into the flame root, finally resulting in flame blow-off.