Effects of co- and counter-swirl on the droplet characteristics in a spray flame
No Thumbnail Available
Date
2008
Journal Title
Journal ISSN
Volume Title
Publisher
ELSEVIER
Abstract
This paper reports measurements of droplet characteristics and flow field in a spray flame with inner and outer swirling air streams. The spatial
distribution of droplet characteristics produced by the burner’s airblast atomizer was measured using dual-phase Doppler anemometry (PDA). The
spray flame was operated near the lean blow-out limit at two flow conditions: co-swirling (flow rotation in the same direction) and counter-swirling
(flow rotation in opposite directions). In both cases, the flame exhibited a U-shaped form and was marked by a large central recirculation zone.
Based on the measurements of the droplet velocity components, differences between both configurations appeared for the counter-rotational setup
mainly in the near burner region, where the decrease of total swirl causes deeper penetration of the droplets from the inner duct into the combustion
chamber, resulting in a much more homogeneous distribution than the other one. The droplet size in terms of the Sauter mean diameter (SMD)
shows little variation in the change of the direction swirl condition. Application of counter-swirl results in more turbulent droplet motion.
Description
Keywords
Spray, Phase Doppler anemometry, Swirl, Flame, Airblast