Abstract
In the present work, an effervescent atomization spray system has been built with plain-orifice atomizer powered by (water / diesel fuel) and air as atomizing gas in the “inside-out” gas injection configuration. The investigation shows the influence of operation and design parameters on the spray cone angle, liquid mass distribution throughout the spray, flame blow-off and flame length. The gas to liquid mass ratio (GLR) varies from 0.3% to 15%, the liquid mass flow rate varies from 0.5 to 10 g/s and the operating pressure varies from 1 to 6 bar. The results show that spray cone angles lie in the range of 15-22° for all gas to liquid ratios, length to diameter ratios and operating pressures. Liquid mass distribution at different axial distances downstream of the atomizer becomes more uniform at lower (L/D) ratio and higher gas to liquid ratio. Increasing (A/F) ratio leads to decreasing flame length. Moreover, an empirical correlation of cone angle with operating and design parameters has been developed.
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