Mixing characteristics of pulsed air-assist liquid jet into an internal subsonic cross-flow |
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Authors: | Inchul Lee Youngsu Kang Jaye Koo |
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Affiliation: | [1]Graduate Student, Korea Aerospace University, Goyang, Republic of Korea [2]School of Aerospace and Mechanical Engineering, Korea Aerospace University, Goyang, Republic of Korea |
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Abstract: | Penetration depth, spray dispersion angle, droplet sizes in breakup processes and atomization processes are very important parameters in combustor of air-breathing engine. These processes will enhance air/fuel mixing inside the combustor. Experimental results from the pulsed air-assist liquid jet injected into a cross-flow are investigated. And experiments were conducted to a range of cross-flow velocities from 42∼136 m/s. Air is injected with 0∼300kPa, with air-assist pulsation frequency of 0∼20Hz. Pulsation frequency was modulated by solenoid valve. Phase Doppler Particle Analyzer(PDPA) was utilized to quantitatively measuring droplet characteristics. High-speed CCD camera was used to obtain injected spray structure. Pulsed air-assist liquid jet will offer rapid mixing and good liquid jet penetration. Air-assist makes a very fine droplet which generated mist-like spray. Pulsed air-assist liquid jet will introduce additional supplementary turbulent mixing and control of penetration depth into a cross-flow field. The results show that pulsation frequency has an effect on penetration, transverse velocities and droplet sizes. The experimental data generated in these studies are used for a development of active control strategies to optimize the liquid jet penetration in subsonic cross-flow conditions and predict combustion low frequency instability. |
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Keywords: | cross-flow penetration pulsed air-assist liquid jet pulsation frequency |
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