Abstract
Effect of acoustic velocity on the primary atomization of a hollow cone spray in a swirling flow field
Highlights
Atomization of a liquid sheet is a critical process in its application in liquid-fuelled propulsion systems
Earlier studies have suggested that acoustic excitation affects droplet formation in a spray, not much has been done to understand the effect of acoustic excitation on the dynamics of primary breakup of sprays
An experimental investigation is performed, on a non-reactive flow, to understand the effect of acoustic velocity fluctuations on the primary atomization dynamics of a hollow cone spray from a pressure swirl nozzle in a strong air swirl using high-speed back-light imaging, The effect of imposing an acoustic velocity on the dynamics of primary atomization is investigated by comparing the spray positioned at three different locations in standing wave field - an acoustic velocity node, acoustic velocity antinode, and a mixed point with non-zero acoustic pressure and acoustic velocity
Summary
Atomization of a liquid sheet is a critical process in its application in liquid-fuelled propulsion systems. Acoustic oscillations affect the spray by forming large-scale vortical structures which entrains droplets, [3, 4] alters velocity field [4] and can increase evaporation rates, [4] thereby decreasing droplet size [5, 6], resulting in finer atomization [7] and enhancing combustion process [8]. These oscillations improve spray development and patternation by changing liquid disintegration characteristics [9, 10]. The paper closes with a summary of the main conclusions
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