Ontology type: schema:ScholarlyArticle
2017-09
AUTHORS ABSTRACTSpray characteristics should be measured to understand fluid atomization. In this study, we investigated the atomization of kerosene fuel with low-flow-rate injectors in small rotary engines by use of optical diagnostic methods. Laser sheet scattering imaging and long-range microscopy were used to produce images of fuel sprays with high spatial and temporal resolutions. Digital image processing techniques were implemented to acquire the macroscopic characteristics of JP-8 jet fuel, such as tip penetration, droplet density distribution, and spray sheet profile. The effect of line pressure and Length-to-diameter (L/D) ratio on the global characteristics of the spray for two nozzles fitted on a high-frequency micro-dispensing system was also explored. The fuel injector was designed for low-flow-rate, low-pressure (less than 10 bar) applications. The local velocity of the fuel droplets was also measured by Particle image velocimetry (PIV). Results show that the decrease in L/D ratio increases average velocity, spray sheet area, and angle. This effect becomes noticeable as the spray jet penetrates further downstream from the nozzle exit, except for tip velocity which drops quickly after the end of the injection pulse especially at high pressure levels. Small droplet diameters are produced in the case of low L/D ratio and high line pressure. According to the PIV test, a connection exists between the tip velocity and velocity components at the central jet. More... »
PAGES4267-4273
http://scigraph.springernature.com/pub.10.1007/s12206-017-0825-6
DOIhttp://dx.doi.org/10.1007/s12206-017-0825-6
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