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Atomization and Sprays
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ISSN Imprimir: 1044-5110
ISSN On-line: 1936-2684

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Atomization and Sprays

DOI: 10.1615/AtomizSpr.2015011361
pages 657-673

EFFECT OF ATOMIZING AIR FLOW ON SPRAY ATOMIZATION OF AN INTERNAL-MIX TWIN-FLUID ATOMIZER

Cheng Tung Chong
Faculty of Mechanical Engineering, Universiti Teknologi Malaysia, 81310 Skudai, Johor, Malaysia
Simone Hochgreb
University of Cambridge

RESUMO

The effect of the atomization air flow rate on the spray characteristics of a swirling twin-fluid atomizer operating on Diesel fuel is investigated. The mean droplet axial velocity and size distributions were simultaneously measured using a phase Doppler anemometer (PDA). The mean droplet diameter is found to increase with radial distance from the spray centreline, while its axial velocity decreases from a peak at the centreline. Increasing the atomizing air-liquid fuel mass ratio (ALR) reduces the fuel droplet size due to the increased shear and increases the spray penetration length as a result of increased momentum. Comparison of the drop size-ALR relations to previous independently developed correlations shows good agreement. A comparison was made between the observable boundaries obtained with Mie scattering and the droplet number density. It is found that the Mie images correspond to 95%−99% edge of the cumulative droplet mass distribution through the spray.


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