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A study on Behavior of Turbulent Transient Jets with Butane and Propane  

Lee, Beom-Ho (인하대학교 기계공학과 공과대학원)
Song, Hak-Hyun (인하대학교 기계공학과 공과대학원)
Cho, Seung-Hwan (인하대학교 기계공학과 공과대학원)
Hong, Sung-Tae (인하대학교 기계공학과 공과대학원)
Lee, Dae-Yup (인하대학교 기계공학과)
Lee, Tae-Woo (국립환경연구원 교통환경연구소)
Publication Information
Journal of ILASS-Korea / v.15, no.2, 2010 , pp. 74-82 More about this Journal
Abstract
In order to understand the behavior of transient gaseous injection used in an LPG (Liquefied Petroleum Gas) engine, turbulent incompressible transient jets with butane and propane were measured and analyzed at pressures of 1.5 bar and 2.0 bar with injector diameters of 3 mm and 5 mm. Mie-scattering method with a tracer was used, and images were processed to investigate the behavior of butane and propane jets. Distances from the nozzle to transition region were measured as $L_e/d_{inj}$=4.35~19.4, where $L_e$ and $d_{inj}$ indicate respectively a distance from nozzle to transition point and nozzle diameter. Slits and tubes around jet at near-field were introduced to measure the effect of entrainment and the diameter of jet, which revealed that the entrainment of surrounding air is significant for developing jet diameter. When the entrainment is restricted, the behavior of jet became deviating from the baseline. It was found that the virtual origin located outside of a nozzle towards jet tip within the conditions of this work, and its location was estimated as $x_o/d_{inj}$=0.56~7.25, where $x_o$ is a distance from nozzle to virtual origin.
Keywords
Gaseous jet; Transient jet; Penetration length; Air entrainment; Virtual origin;
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