%0 Journal Article %A Chong, Cheng Tung %A Hochgreb, Simone %D 2015 %I Begell House %K airblast, twin fluid, atomizer, nonreacting spray, PDA %N 8 %P 657-673 %R 10.1615/AtomizSpr.2015011361 %T EFFECT OF ATOMIZING AIR FLOW ON SPRAY ATOMIZATION OF AN INTERNAL-MIX TWIN-FLUID ATOMIZER %U https://www.dl.begellhouse.com/journals/6a7c7e10642258cc,46bae12102de2f99,40995ade797e41b9.html %V 25 %X The effect of the atomization air flow rate on the spray characteristics of a swirling twin-fluid atomizer operating on Diesel fuel is investigated. The mean droplet axial velocity and size distributions were simultaneously measured using a phase Doppler anemometer (PDA). The mean droplet diameter is found to increase with radial distance from the spray centreline, while its axial velocity decreases from a peak at the centreline. Increasing the atomizing air-liquid fuel mass ratio (ALR) reduces the fuel droplet size due to the increased shear and increases the spray penetration length as a result of increased momentum. Comparison of the drop size-ALR relations to previous independently developed correlations shows good agreement. A comparison was made between the observable boundaries obtained with Mie scattering and the droplet number density. It is found that the Mie images correspond to 95%−99% edge of the cumulative droplet mass distribution through the spray. %8 2015-06-25