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Oil Jet의 볼 체크 밸브의 내부 유동에 대한 수치해석
권지혁(J. H. Kwon),정호윤(H. Y. Jung),이종훈(J. H. Lee),최윤환(Y. H. Choi),이연원(Y. W. Lee) 한국동력기계공학회 2005 한국동력기계공학회 학술대회 논문집 Vol.- No.-
As vehicles are recently becoming more important in our life, the study for engine capacity has been conducted for many years. Specially, the study on lubrication in the engine is needed to develop engine capacity. The role of lubrication is to reduce fraction, manage the temperature and protect from corrosion etc. At the view point of the engine, lubrication and cooling of the engine have an effect on the life and efficiency, so we have to study this problem. Ball check valve is located in the inlet of the Oil Jet. Ball check valve is used to control the flow rate of the engine oil, which cools and lubricates the engine. Flow rate at the oil jet is very important, so the study for this problem is needed to conduct researches. The point of this study is to compute the flow rate and the flow in oil jet. The results of this study is that the mass flow rate is satisfied with the research which is obtained at the experiment.
권지혁(J. H. Kwon),이연원(Y. W. Lee),김영덕(Y. D. Kim) 한국동력기계공학회 2006 한국동력기계공학회 학술대회 논문집 Vol.- No.-
It was stipulated by PAI(Population Action International) that Korea is water-stressed nation. So, we have to get the fresh water. To generate the fresh water, many countries are using desalination system. Desalination system is divided into two types which are evaporation system and reverse osmosis system. In this research, we design evaporation system and the heat source is thermal water. we make shell & tube type desalination device to evaluate our system. To make more effective device, we make vacuum which is made by ejector. In this device, the heat source is electric heater and condenser is fin and tube type. In this system is more effective than device which pressure is atmospheric. After this research, we estimate this device.
정호윤(H. Y. Jung),권지혁(J. H. Kwon),이종훈(J. H. Lee),최윤환(Y. H. Choi),이연원(Y. W. Lee) 한국동력기계공학회 2005 한국동력기계공학회 학술대회 논문집 Vol.- No.-
Now a days Automobiles are becoming more important in our life, the study on piston of engine is needed because, piston's cooling and lubrication of piston have an effect on the life and efficiency of engine directly. So, this study is about nozzle part of oil jet for cooling piston in the automotive engine. Piston exposes combustion gas of over 2000℃ and is shocked high pressure at the time of explosion shortly. Furthermore strong friction occurs by high speed rotation. The cooling system is considered from oil jet to piston. The previous system cooled the lower part of piston only. So, efficiency was low. To improve this system, make the oil gallery in the piston, and oil flows into the gallery. The value of oil flow rate into the gallery is important. Consequently, the point of this study is the research of investigation of flow characteristics for variable Re number. This study has been modelled by a commercial CFD code FLUENT, allowing to assess its validity.
정호윤(H. Y. Jung),박재성(J. S. Park),권지혁(J. H. Kwon),이종훈(J. H. Lee),이연원(Y. W. Lee) 한국동력기계공학회 2006 한국동력기계공학회 학술대회 논문집 Vol.- No.-
Recently, we have many problems on the process of the sewage sludge. In past, the sewage sludge was treated by reclaimed land or thrown away in the sea. But these methods caused environmental pollution, Today, many researchers are studying various methods for reducing its volume. One of these method, this study is to reduce the moisture of sewage sludge and to solidify it using a dryer and curing equipment. In this research, we investigated about design parameter and operation condition of the equipment. The curing equipment reduces the percentage of water content from 30% of dryer to 10%. So, we have to study the curing characteristics and performance of curing equipment. For example, there are internal flow characteristics and change of the percentage of water content. And we investigated the change of data at outlet along the initial condition, temperature, humidity and air flow. Using this data, we achieve the experimental results of curing efficiency by each geometry and operating condition. And we also investigated numerical analysis of internal flow using CFD code. This research is basic study for optimal design of the curing equipment.