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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 ㎫.
액체로켓 엔진 연소기에 장착되는 동축 스월 분사기의 액막 분열 및 분무 특성에 대한 수치적 연구
문윤완(Yoon Wan Moon),설우석(Woo-Seok Seol),윤영빈(Youngbin Yoon) 한국유체기계학회 2006 유체기계 연구개발 발표회 논문집 Vol.- No.-
This study investigated the characteristics of spray generated by a liquid-liquid co-axial swirl injector used in a combustor of the liquid rocket engine. The linear stability analysis[1] was introduced in liquid sheet breakup and Post[2]'s collision model which considers shattering was adopted on the collision model after breakup. Every model was implemented to KIVA[3], which was adopted as a solver. To validate the implemented models the case of low injection velocity which was similar to a injector installed in LRE main combustor was calculated and the result agreed well with test result.