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Dynamics of intersecting pressure swirl sprays
, Dhivyaraja K.
Published in
Intersecting sprays are important to several practical applications from rocket combustion to spray painting. The characteristics of these sprays are examined using water as the working fluid. Three types of atomizer configurations are used for this study: (i) Single spray (ii) Double spray- two pressure swirl atomizers of same type, separated by a distance in the exit orifice plane and (iii) Triple spray- three pressure swirl atomizers of same type, placed on the corners of an equilateral triangle. The Sauter mean diameter, joint velocity and diameter distributions as well as the radial and circumferential liquid distribution are experimentally measured using phase doppler interferometry (PDI) technique. From these results, it is observed that at low injection pressures the liquid sheets emerge from exit orifices interacts. As the injection pressure is increased, the breakup length tends to decrease and a regime is identified where the liquid sheets and droplet clouds interfere. In this regime, the drop clouds formed from the different sheets collide with each other resulting in further increases in velocity and drop size remain unaltered. As a result, the hollow cone nature of the overall spray is transformed into solid cone spray of almost an even mean drop size distribution downstream of the spray intersection region. The study demonstrates that the dynamics of wave propagation on the liquid sheets in intersecting sprays is markedly different from the non-intersecting spray. The superimposition of diameter and velocity distribution of two or more single spray is different from the mutual intersection of multiple sprays. © 2018 Solar Turbines Incorporated.
About the journal
JournalICLASS 2018 - 14th International Conference on Liquid Atomization and Spray Systems
Open AccessNo