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1.4리터급 가솔린 엔진용 터보차저의 기계마찰손실 이론계산 및 시험적 분석
이인범(Inbeom Lee),김구성(Kusung Kim),김정배(Jungbae Kim),최복록(Boklok Choi) 한국자동차공학회 2017 한국자동차공학회 부문종합 학술대회 Vol.2017 No.5
Most turbochargers are supported by two oil lubricated journal bearings and a thrust bearing. This is a main cause of the mechanical friction losses which strongly influence on the mechanical efficiency of the turbocharger. In this paper, theoretical and experimental methods were used to identify the mechanical friction losses of the torbo rotor. The Petroff’s equation was used for numerical calculating the mechanical friction losses in theoretical method. The calorimetric measurement technique was used in experimental method. In order to know the mechanical friction losses of two radial journal bearings without a thrust bearing, the experimental measurement was proceeded in the range which has no axial thrust loads. The turbocharger for a 1.4L gasoline engine was used to measure and calculate the mechanical friction losses and the SAE 10W-30 grade engine oil was used for lubricating the Bearings. In the results of this paper, it was identified that the magnitude of mechanical friction losses due to the oil lubricated bearings. Through the comparison of theoretical result and experimental result, that was verified.
엔진 폐열 회수를 위한 랭킨 스팀 사이클용 열교환기의 유동 및 구조적 특성 연구
정장호(Jangho Jung),김구성(Kusung Kim),이성욱(Seangwock Lee),허형석(Hyungseok Heo),이홍열(Hongyeol Lee) 한국자동차공학회 2012 한국자동차공학회 부문종합 학술대회 Vol.2012 No.5
A 2-loop waste heat recovery system with Rankine steam cycles for the improvement of fuel efficiency of gasoline vehicles has been investigated. A high temperature loop is used to recover waste heat from exhaust gas and a low temperature loop is used to recover waste heat from cold engine coolant. In this paper has dealt with a layout of low temperature loop system, the review of the factors through numerical analysis. According to the result of analysis, the designed heat exchanger, LT Boiler has low equivalent stress than ultimate stress of the material. And comparing with flow analysis results, LT Boiler is safe to operation.
기관 폐열 회수를 위한 열교환기의 Baffle 길이 변경에 따른 성능 예측에 관한 수치 해석적 연구
류규현(Ryu, Kyuhyenn),김구성(Kim, Kusung),이영훈(Lee, Younghum),강석호(Kang, Seokho),박기범(Park, Gibeom) 한국신재생에너지학회 2013 신재생에너지 Vol.9 No.4
A 2-loop waste heat recovery system with Rankine steam cycles for the improvement of fuel efficiency of gasoline vehicles has been investigated. A high temperature loop is used to recover waste heat from exhaust gas and a low temperature loop is used to recover waste heat from cold engine coolant. This paper has dealt with a layout of low temperature loop system, the review of the velocity contours through numerical analysis. According to the result of analysis, the designed heat exchanger. And comparing with flow analysis results, LT Boiler is safe to operation.