Regimes of spray formation in gas-centered swirl coaxial atomizers |
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Authors: | D Sivakumar V Kulkarni |
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Institution: | (1) Department of Aerospace Engineering, Indian Institute of Science, Bangalore, 560012, India |
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Abstract: | Spray formation in ambient atmosphere from gas-centered swirl coaxial atomizers is described by carrying out experiments in
a spray test facility. The atomizer discharges a circular air jet and an axisymmetric swirling water sheet from its coaxially
arranged inner and outer orifices. A high-speed digital imaging system along with a backlight illumination arrangement is
employed to record the details of liquid sheet breakup and spray development. Spray regimes exhibiting different sheet breakup
mechanisms are identified and their characteristic features presented. The identified spray regimes are wave-assisted sheet
breakup, perforated sheet breakup, segmented sheet breakup, and pulsation spray regime. In the regime of wave-assisted sheet
breakup, the sheet breakup shows features similar to the breakup of two-dimensional planar air-blasted liquid sheets. At high
air-to-liquid momentum ratios, the interaction process between the axisymmetric swirling liquid sheet and the circular air
jet develops spray processes which are more specific to the atomizer studied here. The spray exhibits a periodic ejection
of liquid masses whose features are dominantly controlled by the central air jet. |
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