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Communication Dans Un Congrès Année : 2018

Experimental characterization of a canonical two-fluid coaxial atomizer

Résumé

We investigate the break-up and spray development of a liquid jet by a high-speed turbulent coaxial gas jet under a wide range of gas Reynolds numbers and swirl ratios. Despite its extended use in engineering and natural processes to generate a high quality spray, the instabilities that control the liquid droplet size and their spatio-temporal distribution in coaxial atomization are not fully understood. This quantitative understanding is necessary for a first-principles approach to spray control. We present measurements of the liquid interface instability (wavelength and break-up frequency) and droplet size and velocity distributions in the near-and mid-field of a canonical coaxial gas-liquid atomizer. The liquid jet is kept laminar, while the gas-to-liquid momentum ratio varies from 5 to 375 and the gas-phase Reynolds is between 21,200 and 180,000. The gas boundary layer velocity at the exit of the nozzle is measured using a combination of hot-wire anemometry in the absence of liquid, resolving the boundary layer thickness and the azimuthal to axial momentum ratio that causes the three-dimensionality of the flow in the swirl cases. The development of the hydrodynamic instabilities on the liquid-gas interface is quantified using high speed visualizations at the exit of the nozzle and related to the frequency and growth rates predicted by stability analysis of this boundary layer flow. The resulting spray structure is characterized and compared to stability analysis statistical predictions, and will be compared to Large Eddy Simulations simulations of the mid-field by our ONR-MURI collaborators at University of Florida.
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Dates et versions

hal-02518481 , version 1 (25-03-2020)

Identifiants

  • HAL Id : hal-02518481 , version 1

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P D Huck, Nathanaël Machicoane, R Osuna-Orozco, A. Aliseda. Experimental characterization of a canonical two-fluid coaxial atomizer. ICLASS 2018, 14th Triennial International Conference on Liquid Atomization and Spray Systems, Jul 2018, Chicago, United States. ⟨hal-02518481⟩
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