Droplet sizes and velocities in vaporizing sprays

✍ Scribed by A.J. Yule; P.R. Ereaut; A. Ungut

• Publisher: Elsevier Science
• Year: 1983
• Tongue: English
• Weight: 518 KB
• Volume: 54
• Category: Article
• ISSN: 0010-2180
• DOI: 10.1016/0010-2180(83)90018-4

✦ Synopsis

A pulse height laser Doppler anemometer particle sizing technique has been refined to permit simultaneous particle size and velocity measurements in sprays. The improvements include (i) the use of a specially tailored "'top hat" light distribution, to provide unambiguous particle diameter-sigual amplitude relations, (ii) the use of hack scattered light collection, and (iii) the utilization of Mie theory to compute the relations between signal amplitude and particle diameter, in the hackscatter mode. Twin-fluid atomized kerosene sprays have been investigated using the new technique. In these sprays distributions have been mapped of mean droplet diameters, droplet size distributions, and the local correlations between droplet diameters and velocities. The data show the variation of spray structure with atomizer input parameters, the preferential vaporization of smaller droplets, and the differing trajectories of the large and small droplets.