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http://dx.doi.org/10.15435/JILASSKR.2022.27.1.42

Effect of Injection Pressure on the Flash Boiling Spray from Simple Orifice Nozzle  

Lee, Hyunchang (경남대학교 기계공학부)
Cha, Hyunwoo (경남대학교 기계융합공학과)
Kang, Donghyeon (경남대학교 기계융합공학과)
Publication Information
Journal of ILASS-Korea / v.27, no.1, 2022 , pp. 42-49 More about this Journal
Abstract
Flash boiling occurs in a couple of modern engineering systems and understanding its mechanism is important. In this experimental study, discharge coefficient of flash boiling spray from simple orifice nozzle was measured, and backlight imaging was acquired at injection pressure to 6.0 bar and temperature to 163℃ for the purpose. Pressurized water by pump was used for working fluid and was heated by electric heater and ejected through simple orifice nozzle diameter of 0.5 mm. High speed camera with long distance microscope was used for backlight imaging in two FoV having magnification of 3.3 and 0.64. The decrease of discharge coefficient according to degree of superheating and evolution of flash boiling spray imaged at various pressure and temperature were explained by the pressure field inside the injector.
Keywords
Discharge coefficient; Spray angle; Long distance microscope; Backlight imaging;
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