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이중 공기공급 이유체 선회노즐의 내부 형상이 분무 특성에 미치는 영향
강신명(Shinmyoung Kang),최윤준(Yoonjun Choi),우재문(Jaemoon Woo),김덕진(Duckjin Kim),이지근(Jeekeun Lee),노병준(Byungjoon Rho) 대한기계학회 2008 대한기계학회 춘추학술대회 Vol.2008 No.5
The regulations to reduce the exhaust emissions from vehicles are becoming increasingly stringent and encompassing more types of vehicles. In the case of heavy duty diesel engines, the Urea-SCR system is currently considered to reduce the NOx emission as a proved technology, and it is widely studied to get the high performance and durability. However, the injection nozzles occur some problems, including the nozzle clogging, deposition of urea-water solution on the inner wall of exhaust pipe. In this study, the effects of nozzle cap geometry, the length to diameter ratio(l<SUB>o</SUB>/d<SUB>o</SUB>) on the spray characteristics were investigated. The mean velocity, AMD and SMD distributions of the sprays were measured using a 2-D PDA system along the centerline and radial direction. As the experimental results, the higher length to diameter ratio(l<SUB>o</SUB>/d<SUB>o</SUB>) affects the increase of axial mean velocity and the decrease of radial mean velocity. The AMD and SMD increased with the length to diameter ratio(l<SUB>o</SUB>/d<SUB>o</SUB>), as well.