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- W3120823699 abstract "Liquid atomization plays an important role in automobiles, propulsion, power generation, and chemical industries. A liquid injection scheme capable of rapidly generating fine droplets for faster evaporation is sometimes preferred. Injection of fuel containing dissolved gas can be one of the promising injection schemes. With an optimized injection condition, precipitation and expansion of the dissolved gas during the injection processes is capable of shattering the liquid column, leading to favorable liquid atomization. This injection scheme is similar to barbotage (or effervescent/aerated-liquid) injection scheme with the exception that the gas is fully dissolved into the liquid prior to injection and, due to gas precipitation, the formation of two-phase mixture during the injection processes occurs on a smaller scale for a uniform liquid mass distribution. The major objective of this study is to qualitatively characterize the structures of diesel with dissolved gas in a supersonic crossflow environment. The experiment was carried out inside the Mach 2 supersonic wind tunnel at the Air Force Research Laboratory at Wright-Patterson Air Force Base. Calibration fluid 1487 (CF-1487) was selected as the working liquid. Carbon dioxide was dissolved into CF-1487 prior to injection into the supersonic crossflow. Temporal evolution of the near-field structures was explored with the shadowgraph imaging technique operated at 50K frames per second. Penetration height for each individual frame was determined using in-house developed software and used to derive statistical comparisons. The cross-sectional plume structures were characterized by the laser-sheet illumination technique, where a thin laser sheet illuminates the liquid plume normal to the freestream flow direction to qualitatively depict cross-sectional liquid distribution pattern. Results show that when compared to pure liquid, cases in which gas was not fully dissolved prior to entering the nozzle, the average penetration height had a large increase as did the instabilities in the plume outer boundary. Whereas in cases in which the gas is fully dissolved, there are minimal gains in the average penetration height while being equally as stable as pure liquid." @default.
- W3120823699 created "2021-01-18" @default.
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- W3120823699 date "2021-01-04" @default.
- W3120823699 modified "2023-09-23" @default.
- W3120823699 title "Structures of Diesel with Dissolved Gas in Supersonic Crossflow" @default.
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- W3120823699 doi "https://doi.org/10.2514/6.2021-0753" @default.
- W3120823699 hasPublicationYear "2021" @default.
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