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이대희(D.H. Lee),차윤석(Y.S. Cha),이대근(D.K. Lee),이준식(J.S. Lee),임창율(C.Y. Lim),김영생(Y.S. Kim),배종렬(J.R. Bae) 대한기계학회 2006 대한기계학회 춘추학술대회 Vol.2006 No.6
An innovative crankless steam engine utilizing the rack and pinion has been developed to improve the thermal efficiency of the engine. This newly developed crankless steam engine converted the thermal energy of steam to the electrical power output by way of the rack and pinion instead of the conventional crank. Straight motion due to the rack changed to the rotary motion by the pinion gear of the clutch. The crankless steam engine performance was tested with steam at 5 to 6.5 ㎏<SUB>f</SUB>/㎠ and the power output varied from 2.4 to 8.0 ㎾. It follows that the maximum efficiency of the crankless steam engine has reached 74 % when the steam inlet pressure is 6.5 ㎏<SUB>f</SUB>/㎠ and the power output is 8.0 ㎾. The maximum efficiency of this engine is more than 2 times as high as the existing conventional crank engine.
나선형 홈을 가진 벤틸레이티드 디스크 브레이크 유로 내에서의 열적 성능 해석
이대근(D.K. Lee),차윤석(Y.S. Cha),이준식(J.S. Lee),박성봉(S.B. Park),이대희(D.H. Lee) 한국자동차공학회 2007 한국자동차공학회 지부 학술대회 논문집 Vol.- No.-
Effects of the flow passage geometry in ventilated disc brake on thermal performance have been investigated. The heat transfer measurements in the flow passage having both flat surface and spirally grooved surface geometries inside the automobile disc brake were made. Liquid Crystal-shroud transient technique was used to measure the local heat transfer coefficients. These measured local heat transfer data were utilized to numerically predict the temperature distributions as well as thermal stresses on the disc brake. The results show that the maximum temperatures on the disc brake with spirally grooved surface are approximately 44.3% lower than those with the flat surface. Thermal stresses with spirally grooved surface in the outlet region of the flow passage are approximately 2.5 times as large as those with the flat surface.