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GDI 인젝터 노즐 설계 변수에 따른 비정상 유동 특성
봉선우(SeonWoo Bong),이헌균(HeonKyun Lee),윤권덕(GweonDuk Yoon) 한국자동차공학회 2019 한국자동차공학회 부문종합 학술대회 Vol.2019 No.5
Recently, studies on the dynamic behavior of injector nozzles are actively underway, and studies on the flow characteristics in the nozzles have been actively conducted through the CFD due to the improved computer function. In this study, flow characteristics according to injector nozzle design parameters were analyzed by using commercial analysis program. In order to investigate cavitation and the behavior of air and liquid in the nozzle due to the sudden pressure change inside nozzle, multiphase flow analysis using VOF was used. In addition, UDF function was used to control the force acting on the ball that changes with time and the moving distance of the ball. Remeshing was performed periodically using the dynamic mesh function.
습식 DCT용 유압제어 핵심부품의 형상이 누설 유량에 미치는 영향
봉선우(SeonWoo Bong),이헌균(HeonKyun Lee),윤권덕(GweonDuk Yoon),이동헌(DongHeon Lee),이재경(JaeKyung Lee) 한국자동차공학회 2018 한국자동차공학회 부문종합 학술대회 Vol.2018 No.6
Recently, Dual Clutch Transmission(DCT) with high efficient of the manual transmission and convenience of the automatic transmission has been researched and developed. DCT is divided into dry and wet depending on whether the oil is used or not. Wet DCT have to use hydraulic pressure to deliver the clutch’s large torque without loss. Therefore, It is necessary to develop a solenoid-type control valve capavle of high pressure control at level of 60bar. In this study, the effect of spool and flange geometry affecting leakage has been investigated using computational fluid analysis. Also, prototypes were fabricated to evaluate leakage according to clearance.