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Communication Dans Un Congrès Année : 2018

Characterizing the Near-Field Region of a Spray using White Beam and Focused Beam X-ray Measurements

Résumé

A current area of investigation is controlling sprays using real-time feedback. In working towards this goal, it is necessary to create a reduced-order model of the spray. The model will then be used to determine the best method of monitoring the spray, and provide an estimate of the resulting change from the controlling mechanism. The current work focuses on characterizing the near-field region of a coaxial airblast atomizer, to eventually formulate a data-driven model for spray control. High-speed white beam imaging and focused beam X-ray measurements of the near-field region of the atomizer have been recorded at the Advanced Photon Source. We characterize a natural harmonic that starts near the nozzle outlet and progresses to a maximum instability in the near-field region. Liquid ligaments and internal air bubbles are observed in a region that was previously thought to be a continuous liquid core. Swirl has been added to the air stream of the atomizer and has been shown to change the location of maximum instability as well as the shape of the spray. All of these tests resulted in an area of particular interest approximately one to two nozzle diameters downstream from the nozzle outlet, and it is shown that it is the location of primary breakup, pinching spray angle, maximum standard deviation, and maximum instability. Future work will combine the current data with those obtained in the far-field region to create a reduced-order model for spray control.
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Dates et versions

hal-02518462 , version 1 (25-03-2020)

Identifiants

  • HAL Id : hal-02518462 , version 1

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J K Bothell, D. Li, T B Morgan, T. Heindel, A. Aliseda, et al.. Characterizing the Near-Field Region of a Spray using White Beam and Focused Beam X-ray Measurements. ICLASS 2018, 14th Triennial International Conference on Liquid Atomization and Spray Systems, Jul 2018, Chicago, United States. ⟨hal-02518462⟩
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