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윤영빈(Youngbin Yoon),고현석(Hyeonseok Koh),전재영(Jaeyoung Jeun),김동준(Dongjun Kim) 한국자동차공학회 2002 한국자동차공학회 Symposium Vol.2002 No.11
Over the years. planar laser imaging techniques have been developed for the spray characterizations. The planar imaging technique provides the high resolution and quantitative information of the spray. Fuel distribution in sprays can be obtained from the fluorescence image. and Sauter Mean Diameter (SMD) can be measured from the ratio of fluorescence to Mie-scattering images. However, in the dense spray region. the attenuation of the laser beam and signal cause the significant misinterpretation of signal intensities. In order to correct these problem, especially, the attenuation of the emitted signals passing through the optically dense media. the method to find the geometric mean of the signal intensities obtained from two cameras is therefore evaluated and verified. Results show that the proposed method can provide the good agreement with PDPA in the dense region.
윤영빈(Youngbin Yoon),고현석(Hyeonseok Koh),김동준(Dongjun Kim),길태옥(Taeock Khil) 한국가시화정보학회 2005 한국가시화정보학회지 Vol.3 No.2
The optical patterantor provides the high resolution and quantitative information of the spray. Fuel distribution and Sauter Mean Diameter (SMD) can be measured from fluorescence and Mie-scattering images. To correct the attenuation of the laser beam and signal in dense spray region, the method to find the geometric mean of the signal intensities obtained from two cameras was evaluated and verified in a solid-cone spray. In high pressure environment, the increased number density of the droplets cause multiple scattering. The optical patternation technique using a laser beam instead of a laser sheet was applied to minimize the multiple scattering problem. The pattern of a coaxial spray was changed from hollow-cone to solid-cone shape, and the spray angle was reduced as the ambient pressure increased from 0.1 to 4.0 ㎫.
Jungsoo Yoon,Jae Mook Chung,Youngbin Yoon 대한조선학회 2011 International Journal of Naval Architecture and Oc Vol.3 No.4
In order to design a shear coaxial injector of solid particles for underwater propulsion system, basic experiments on gas-liquid shear coaxial injector are necessary. In the gas-liquid coaxial injector self-pulsation usually occurs with an intense scream. When self-pulsation occurs, mass flow rate oscillation and intense scream are detected by the interactions between the liquid and gas phase. Self-pulsation must be suppressed since this oscillation may cause combustion instabilities. Considerable research has been conducted on self-pulsation characteristics, but these researches are conducted in swirl coaxial injector. The main objective of this research is to understand the characteristics of self-pulsation in shear coaxial injector and reveal the mechanism of the phenomenon. Toward this object, self-pulsation frequency and spray patterns are measured by laser diagnostics and indirect photography. The self-pulsation characteristics of shear coaxial injector are studied with various injection conditions, such as the pressure drop of liquid and gas phase, and recess ratio. It was found that the frequency of the self-pulsation is proportional to the liquid and gas Reynolds number, and proportional to the L/d.