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Atomization and Sprays
Editor-in-Chief Europe: Günter Brenn (open in a new tab)
Editor-in-Chief Americas: Marcus Herrmann (open in a new tab)
Редактор-основатель: Norman Chigier (open in a new tab)

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ISSN Печать: 1044-5110

ISSN Онлайн: 1936-2684

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EFFECTS OF KEY PARAMETERS ON VISCOUS HOLLOW CONE SPRAY ANGLE AND AVAILABLE CORRELATION FOR SPRAY ANGLE PREDICTION

Том 32, Выпуск 10, 2022, pp. 71-88
DOI: 10.1615/AtomizSpr.2022040731
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Краткое описание

Pressure swirl atomizers are widely applied in daily life and production activities. The spray angle is one of the most important parameters for pressure swirl atomizers and mainly affects the spatial distribution of sprays and droplets. The quick prediction of the spray angle is important for the design and optimization of a pressure swirl atomizer. In the present study, the effects of length of swirl chamber, liquid viscosity, and pressure differential on the hollow cone spray angle are studied by experiments. Then, an available semiempirical correlation for a hollow cone spray angle prediction is derived by proper assumptions and simplification. This available correlation is validated by comparison to the experimental results. Furthermore, other correlations based on inviscid flow and viscous flow are also introduced to predict the spray angle for comparison. On the basis of the experimental results, the measured hollow cone spray angle decreases with an increase of the length of swirl chamber and liquid viscosity nonlinearly. The measured hollow cone spray angle shows no obvious growth with the increasing pressure differential when the pressure differential reaches a critical value. Further, the hollow cone spray angles predicted by the present available correlation agree well with the experimental results. The prediction uncertainties can be within ± 15% for all cases; whereas, the prediction uncertainties are no less than ± 40% by other correlations. Compared to previous correlations, the present available correlation can achieve better prediction accuracy. This available correlation is capable for the quick prediction of the viscous hollow cone spray angle.

Figures

  • Schematic of the geometric configuration of the typical pressure swirl atomizer
  • Schematic of experimental system
  • Successive instantaneous images of spray generated by the pressure swirl atomizer whose length
of swirl chamber is 2.6 mm
  • Process to obtain the spray angle: (a) successive transient image, (b) time-average spray image,
and (c) spray boundaries detection
  • Images of variation of the spray angles with the length of swirl chamber (volume ratio of glycerol
= 0% and p = 1.0 MPa)
  • Variation of the measured spray angles with the length of swirl chamber
  • Images of variation of the spray angles with the liquid viscosities (Ls = 2.6 mm and p = 1.0 MPa)
  • Variation of the measured spray angles with liquid viscosity
  • Images of variation of the spray angles with the injection pressure differential across the atomizer
(Ls = 10 mm and volume ratio of glycerol = 0%)
  • Variation of the measured spray angles with the injection pressure differentials across the atomizer
  • Comparison of the predicted spray cone angles to the experimental results
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