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Droplet size dispersion in the spray cone of jet-swirl atomizers

Prywer J., Opara T., Opara K.

Journal of KONES

2007

Vol. 14, No. 4

357-364

The burning process in the combustion engines strongly depends on the quality of atomization; hence the microstructure of the atomized fuel is an important factor for designers. Jet-swirl atomizers spray fuel into a wide cone of directions, as quite small droplets, which ensures effective burning. In some applications (e.g. turbine engines) it is important to guarantee that a certain portion of mass of the fuel is atomized in droplets of diameters lower to a fixed critical value Dk. This can be done by creating a quasi-monodispersive distribution of small droplets. The paper presents the results of experimental and statistical investigations into the microstructure of aerosols, with particular interest in the relative standard deviation of droplets diameters d and its relations with the mass portion of droplets of diameters greater the critical value Dk. Diagram of flow through a jet-swirl atomizer with swirling grooves, relative radius is the ratio of radius at which measurements were made, to the spray cone radius, log-normal distribution fitted to a typical experimental data set and the corresponding mass distribution, log-normal distribution fitted to a typical experimental data set and the corresponding mass distribution, Dependence of the mass carried by droplets are illustrated in the paper.