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Atomization and Sprays
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ISSN Imprimir: 1044-5110
ISSN En Línea: 1936-2684

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Atomization and Sprays

DOI: 10.1615/AtomizSpr.v1.i2.60
pages 215-235

ANALYSIS OF PRESSURE SWIRL AND PURE AIRBLAST ATOMIZATION

Chien-Pei Mao
Delavan, Inc., West Des Moines, Iowa 50265
S. G. Chuech
CFD Research Corporation, Huntsville, Alabama 35805
A. J. Przekwas
CFD Research Corporation, Huntsville, Alabama 35805

SINOPSIS

The fundamental aspects of pressure swirl and airblast atomization in both the break up and drop dispersion regimes are examined. Experiments were conducted by using a high-magnification 4 × 5 camera and an Aerometrics Phase/Doppler particle analyzer to evaluate the spray characteristics and atomizer performance. The primary parameters of interest are liquid film break up length, spray angle, drop size, and trajectory. Observation of wave formation and propagation along the sheet surface was made to provide guidance in formulating mathematical models. Effects of air flow and nozzle design on atomization were examined for a wide range of flow conditions. Computational analysis also was used to predict the sheet break up and subsequent drop behavior. This model considered a swirling sheet interacting with the surrounding air streams. The governing equations were formulated in a curvilinear coordinate system conforming to the film boundaries. Primary break up is based on linear stability analysis. The present model is capable of predicting the variations in thickness, trajectory, velocity, and angle of a liquid film as a function of nozzle geometry, operating conditions, fluid properties, and ambient conditions. Secondary break up and drop history calculations were also included in the model to provide local drop-size spectra. Agreement between the experimental and predicted break up length and angle was excellent. Predictions of drop size, trajectory, and other parameters were qualitatively correct. The present investigation demonstrated a realistic approach for simulating the break up process and described the physical structure of pressure swirl and pure airblast atomizer sprays.


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