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An experimental study of a spray created by the impingement of two jets of metallized gelled fuel is presented. The gelled fuel is formed by liquid kerosene (60%), 15∞m-size aluminum particles (30%), organophilic clay (8%), and propylene glycol (2%). The coefficient of discharge for flow of the above fluids through different injector orifices was determined. The pressure drop across the orifice and the orifice diameter were varied. The coefficient of discharge with the 1 mm orifice is higher than that with the 1.5 mm orifice at a higher injection pressure, which shows the non-Newtonian behavior of the gelled fuel. A like-on-like doublet impingement type injector element is chosen to study the atomization characteristics of the gelled fuel. The spray formed by this injector is imaged with high temporal resolution at different injection pressures and included angles of the jets. The images are digitally processed to measure the droplet size distribution, the spray breakup length and the spray angle. These images reveal the formation of circular instability waves at the point of impingement which break the liquid sheet into ligaments and droplets. The jet velocity and the included angle affect the atomisation quality of the gelled fuel. The mean droplet size is lower at a higher included angle and injection pressure due to the high shear rate in the injector orifice and impingement point. Finally, the atomisation quality of the gelled fuel jet impingement is compared with that of water jet impingement. It is found that Sauter mean diameter of the gel spray is more sensitive to the included angle and is dependent on the injection pressure in highly nonlinear manner relative to the water spray.
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Journal | Data powered by Typeset41st Aerospace Sciences Meeting and Exhibit |
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Publisher | Data powered by TypesetAmerican Institute of Aeronautics and Astronautics |
ISSN | 0001-1452 |
Impact Factor | 1.868 |
Open Access | No |
Citation Style | unsrt |
Sherpa RoMEO Archiving Policy | Green |