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피스톤링의 회전운동이 오일소모에 미치는 영향 -제1보 : 피스톤링의 회전운동 측정-
김중수(J.S.Kim),민병순(B.S.Min),오대윤(D.Y.Oh),최재권(J.K.Choi),진준하(J.H.Jin) 한국자동차공학회 1998 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1998 No.5_1
The rotational movements of piston rings were measured by a radiotracer technique in a single cylinder engine. In order to measure the rotation of the top and 2'nd ring simultaneously, two kinds of isotopes, ^60Co and ^192Ir, were used and mounted in each rings. 3 NaI γ -ray detectors were used to measure y -ray intensities. While motoring the assembled engine, the y -ray intensities were measured with the ring gap fixed at a certain angle, and as a result of repeating this procedure, the relationship between the gap angle and y -ray intensities was calculated. Based on this calibration results, algorithm was made to determine the gap angle from the measured y -ray intensities and the uncertainties was below 8° . As results of the experiment, it was known that the movement of each ring isn't dependent on the other ring and also isn't regular at same operating condition. The rotational speed was within the range of 0.2~0.4 rev/min. Even though the movement patterns were arbitrary at the same condition, the tendency was found that the ring can rotate easily at low load condition.<br/>
피스톤링의 최전운동이 오일소모에 미치는 영향 -제2보 : 링갭의 위상각과 오일소모와의 관계-
민병순(B.S.Min),김중수(J.S.Kim),오대윤(D.Y.Oh),최재권(J.K.Choi),진준하(J.H.Jin) 한국자동차공학회 1998 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1998 No.5_1
In order to understand the relationship between the phase angle of piston ring and oil consumption, the ring rotation and instantaneous oil consumption were measured at the same time. The ring rotation was measured by radio-tracer technique. The instantaneous oil consumption was measured by analyzing CO₂ concentration in exhaust gas. The use of hydrogen fuel not gasoline makes this possible because all of the carbon component in exhaust gas can be assumed to be produced from oil. As a result of experiment, it is known that the oil consumption varies periodically and a specific location of ring end gap was found at each peak of oil consumption. Therefore, it was found that the oil consumption was not constant even at the same operating conditions and this is because the relative locations of top and 2'nd ring end gap change arbitrarily.<br/>