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Портал Begell Электронная Бибилиотека e-Книги Журналы Справочники и Сборники статей Коллекции
Atomization and Sprays
Импакт фактор: 1.262 5-летний Импакт фактор: 1.518 SJR: 0.814 SNIP: 1.18 CiteScore™: 1.6

ISSN Печать: 1044-5110
ISSN Онлайн: 1936-2684

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Atomization and Sprays

DOI: 10.1615/AtomizSpr.v10.i6.50
24 pages


M. de Vega
Universidad Carlos III de Madrid (UC3M), Avda. Universidad 30, 28911 Leganes, Madrid, Spain
A. Lecuona
Area de Ingenieria Termica. E.P.S. Universidad Carlos III de Madrid, Madrid Spain

Краткое описание

The far-field turbulent structure of an airblast coaxial spray without swirl has been studied using a two-velocity-component phase Doppler anemometer. Size, velocity, and droplet number density have been measured at nine different locations from the injection plane. The measurements have been checked against an extinction sensor. Deceleration has been studied and compared with other experiments in coaxial sprays, gaseous, and particle-laden jets. An expression, valid to describe the deceleration in coaxial sprays with a similar breakup mechanism, is proposed. Furthermore, five representative droplet families discriminated by their Stokes number have been selected to study differences in their dynamic evolution in the spray. Self-similar velocity profiles in the mean and turbulent components have been obtained. In the axial component all droplets are seen to behave similarly, while significant differences are observed in the transverse velocity. Mean particle number density profiles are top-hat-shaped, while the highest number density of droplets with Stokes number near unity is placed at off-axis locations. The distribution of the volume flux has also been calculated.