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Communication Dans Un Congrès Année : 2018

Effect of modulation of the swirl ratio and gas and liquid flow rates on the structure of the spray produced by a two-fluid coaxial atomizer

Résumé

Effect of modulation of the swirl ratio and gas and liquid flow rates on the structure of the spray produced by a two-fluid coaxial atomizer Abstract The effect of harmonically oscillating the gas swirl ratio, and the liquid and gas flow rates on the droplet size and number density distributions is experimentally studied. A coaxial two-fluid atomizer with laminar liquid and turbulent gas streams is investigated using high-speed video shadowgraphy, as well as interferometric droplet size and velocity measurements. The liquid mass loading is kept small (0.1 < m < 0.55), while the gas momentum ratio, M , is varied from 5 to 125. The swirl ratio (the ratio of the gas flow rate injected into the atomizer nozzle with angular momentum to the gas flow rate injected without angular momentum) ranges from zero to one. The flow rates are perturbed via harmonic forcing of the gas and liquid injection rates. The effect of the flow rate modulation frequency and amplitude, on both the spray primary instabilities and the droplet spatial distribution are characterized. We also investigate how the swirl ratio can be used to finely tune external perturbations, aimed at achieving better spray control. The laminar liquid stream is charged by the strong local electric field created between the metallic injection needle used as the anode, and a ring located on the streamwise end of the coaxial gas chamber used as the cathode. The electric charge in the liquid depends on the liquid and gas flow rates, and affects the primary instabilities, thus feeding into the variables modulated in the overall spray control strategy
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Dates et versions

hal-02516292 , version 1 (23-03-2020)

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  • HAL Id : hal-02516292 , version 1

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A. Aliseda, R Osuna-Orozco, P D Huck, Nathanaël Machicoane. Effect of modulation of the swirl ratio and gas and liquid flow rates on the structure of the spray produced by a two-fluid coaxial atomizer. ICLASS 2018, 14th Triennial International Conference on Liquid Atomization and Spray Systems, Jul 2018, Chicago, United States. ⟨hal-02516292⟩
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