Erscheint 4 Ausgaben pro Jahr
ISSN Druckformat: 1065-3090
ISSN Online: 1940-4336
Indexed in
EXPERIMENTAL STUDY ON LIFT-OFF JET DIFFUSION FLAME MORPHOLOGY IN THE INTERIM OF DOUBLET FLOWS UTILIZATION
ABSTRAKT
Experiments were carried out on turbulent jet diffusion flames, with the focus placed on the lift-off flame morphology in the interim of doublet flow utilization to investigate the alteration pattern of the flame. Real-time imaging video recording, as well as image processing and treatment devices, were employed. Doublet flows are formed with the concentric annulus, in which fuel jet is injected up from an inner fuel nozzle while air from the surroundings is sucked into the outer tube encompassing the nozzle. It has been found that (1) real-time imaging recording and timewise variation of flame image analysis were able to grasp a real picture for flame lift-off phenomena, (2) statistical and quantitative treatment for flame liftoff heights and base widths was the correct approach for the morphology analysis, and (3) flames oscillated immensely above the fuel nozzle with frequent reattachment when volume flow rate of air was set to the maximum, which validates the positive effect of doublet flows on enhancement of flame blowout limits.