Stabilization Mechanism of Burner-attached Flames in Laminar Non-premixed Jets

The stabilization mechanism of nozzle-attached flames in laminar non-premixed jets was studied experimentally and numerically. local gas flow velocity the flame propagation speed within mixing layer at base were obtained before blowout limit reached. experimental results show that, for burner-attached flames, is much less than burning speed, suggesting that partially premixed stopped. thickness fuel/air attached quite narrow (1.1–1.5 mm) minimum quenching distance caused by conductive heat loss to tube (or slit) wall flame. Heat losses conduction from burner wall, convection between incoming (hereafter referred as convection) through simulation. significant roles these effects analyzed. While fuel neglected, can propagate along a narrower layer. On contrary, critical (in which sustain) exists near with considering loss. plays relatively important role without small amount of) coflow air. As air increases, due gradually exhibits on stabilization. In addition, simple theoretical model provided based balance released chemical reaction lost convection, clear dependence speed. stability behaviors be reasonably explained predicted such relation.