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차량용 가변사판식 압축기의 흡입체크밸브 최적화에 관한 연구
이봉섭(Bongsub Lee),이용주(Yongju Lee),이태진(Taejin Lee),한준석(Junseok Han),배인표(Inpyo Bae),이건호(Geonho Lee) 대한설비공학회 2016 대한설비공학회 학술발표대회논문집 Vol.2016 No.6
Development of a compressor for vehicle air conditioning system has been focused on high performance and noise reduction. Suction check valve is used to prevent the noise that is caused by the suction pulsation when a clutch-less compressor is operating in an OFF state. However, the suction pressure drop due to the increased flow resistance reduces the cooling capacity of a compressor. The aim at this study is to predict the cooling capacity drop rate and improving the performance with optimized suction check valve shapes. It proposed the theoretical cooling capacity drop rate, and the experimental studies were carried out in order to verify this. But those were not matched each other so that CFD analysis program was used to look for the cause. Results show that the pressure distribution of a valve surfaces affects the suction pressure drop. The cooling capacity was improved by the suction check valve that is modified to increase average pressure on a valve surface.
디젤기관 대체연료 미강유의 분사율 및 배기 배출물 특성
배명환(Myung-whan Bae),이봉섭(Bongsub Lee),임기창(Kichang Im),옥현진(Hyun-jin Ok),김인덕(In-deok Kim),한영욱(Young-wook Han),Syaiful,B. W. Riayndwita 한국자동차공학회 2007 한국자동차공학회 지부 학술대회 논문집 Vol.- No.-
In order to investigate the effect of heated temperature on fuel injection rate for fuels such as light oil, blend of rice bran oil and light oil, and pure rice bran oil as a parameter of injection pump rack stroke, tests are performed by an injection pump tester at three kinds of cam shaft speed. In this study, also, the effects of rice bran oil properties on the fuel economy and exhaust emissions are experimentally examined by a single cylinder, four cycle, direct injection, water-cooled diesel engine operating at several engine loads and speeds. The fuel injection timing is fixed to 22° BTDC regardless of fuel types, engine loads and speeds. The kinematic viscosity of rice bran oil is very high compared with light oil. Also, the oxygen is not contained at all in light oil, while the oxygen contents of 10.7% are included in rice bran oil. In this study, results show that fuel injection rate increases as injection pump rack stroke and cam shaft speed are elevated at the same conditions, and as heated temperature is elevated with the exception of light oil. It is also found that brake specific fuel consumption rate and NOx emissions increase, while soot emissions decrease as the blending rate of rice bran oil is enriched. Thus we can conclude that the combustion process which affect the fuel economy and exhaust emissions of diesel engines using rice bran oil as a fuel is controlled by the differences of chemical and physical properties.