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雾化与喷雾
影响因子: 1.262 5年影响因子: 1.518 SJR: 0.814 SNIP: 1.18 CiteScore™: 1.6

ISSN 打印: 1044-5110
ISSN 在线: 1936-2684

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雾化与喷雾

DOI: 10.1615/AtomizSpr.v15.i2.70
pages 223-247

LIQUID JET BREAKUP AND ATOMIZATION BY ANNULAR SWIRLING GAS JET

Arnaud Dunand
Laboratoire de Combustion et Detonique, CNRS UPR 9028, University of Poitiers, ENSMA, 1 Avenue Celement Ader, BP 40109, 86961 Futuroscope, Chasseneuil Cedex, France
Jean-Louis Carreau
Institut PPRIME, Département Fluides, Thermique, Combustion, CNRS ENSMA Université de Poitiers UPR 3346, ENSMA BP 109, 86960 FUTUROSCOPE Cedex, France
Francis Roger
Institut PPRIME, Département Fluides, Thermique, Combustion, CNRS ENSMA Université de Poitiers UPR 3346, ENSMA BP 109, 86960 FUTUROSCOPE Cedex, France

ABSTRACT

In spray systems, swirl motion is generally imparted to the liquid jet in order to favor its fragmentation. In coaxial atomization applications, however, due to its higher momentum, the dynamics of the flow is controlled mainly by the annular gas jet. As a consequence, we examine the effect of a swirling coaxial gas jet on breakup and atomization of a liquid jet as a function of the rotation intensity, given by the swirl number S, gas-to-liquid momentum flux ratio J, and surrounding pressure. The main results were: low enhancement of the atomization with no major changes of the jet development for low swirl, but, when a critical amount of rotational flow is imparted to the gas stream according to experimental conditions, topology of the flow is significantly modified. This transition leads to a significant decrease in liquid jet breakup length and an inversion of droplet distribution. The second kind of flow is linked with the appearance of a stagnation point on the jet centerline, whose occurrence and characteristics depend on operating conditions.


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