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[가솔린엔진부문] 이온신호를 이용한 직접분사식 가솔린 엔진의 노킹 특성에 관한 연구
박기원(Kiwon Park),박종일(Jongil Park),전광민(Kwangmin Chun) 한국자동차공학회 2000 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
There are two type of injection mode in direct injection gasoline engines. One is homogeneous mode that is used in high load operation and the other is stratified mode that is used in part load operation. Flame propagation and knock characteristics in direct injection gasoline engine may differ from those of port injection type because the piston of direct injection gasoline engine has cavity for stratified mode. So the study of knock characteristics and flame propagation in direct injection engine are needed.<br/> In this experiment, knock occurrence angle, knock occurrence cycle, knock intensity and location of knock occurrence are studied. Knock occurrence cycle increases and knock occurrence angle is earlier when air-fuel mixture is richer and load is higher. Knock intensity is also higher when air-fuel mixture is richer and load is higher. Knock occurs in the front and rear sides in the cylinder where flame reaches at the last.<br/>
동판 표면에서의 동결억제를 위한 초음파 이용에 관한 실험적 연구
박기원(Ki-Won Park),황성수(Sung-Su Hwang) 대한설비공학회 2013 대한설비공학회 학술발표대회논문집 Vol.2013 No.6
This study attempted to examine a method to anti-freezing under the same conditions by conducting experiments on the heat exchange in a low-temperature environment, and ice making characteristics were observed after generating ultrasonic waves in solids and fluids as the method. To find the optimal conditions, ethylene glycol was used as the brine under copper plate, and the temperature was circulated to -8, and –10 etc. Data was observed and recorded by dividing water used in freezing provided by the thickness of 1~3mm into water in which ultrasonic waves are produced and that in which those are not produced.
동관 표면에서의 동결억제를 위한 초음파 이용에 관한 실험적 연구
박기원(Ki-Won Park),황성수(Sung-Su Hwang) 대한설비공학회 2013 대한설비공학회 학술발표대회논문집 Vol.2013 No.6
This study attempted to examine a method to anti-freezing under the same conditions by conducting experiments on the heat exchange in a low-temperature environment, and ice making characteristics were observed after generating ultrasonic waves in solids and fluids as the method. To find the optimal conditions, ethylene glycol was used as the brine inlet copper tube, and the temperature was circulated to –8, -10, etc. Data was observed and recorded by dividing water used into water in which ultrasonic waves are produced and that in which those are not produced.