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DOHC 가솔린기관의 연소실 벽표면순간온도 및 비정상 열유속 측정 및 해석(제3보:실린더 라이너에 관한 연구)
위신환(Shinwhan Wei),이종태(Jongtai Lee) 한국자동차공학회 2000 한국 자동차공학회논문집 Vol.8 No.3
Instantaneous temperature probes were manufactured by pressing method. By using these probes. the instantaneous surface temperature and unsteady heat flux in the cylinder liner of DOHC engine were measured. The main results are as follows; i) the instantaneous surface temperature of cylinder liner are affected by the contact of piston ring as well as burning gas.<br/> ii) the wall temperature of the siamese portion is much higher than other parts, iii) it was shown that the rising trend of heat flux by burning gas are nearly limited to the 1/2-stroke distance from the top of cylinder liner.
DOHC 가솔린기과의 열부하대책을 위한 실린더해드 및 국소 배기밸브 브릿지부의 냉각수 유동해석
위신환(Shinwhan Wei),이종대(Jongtai Lee) 한국자동차공학회 2002 한국 자동차공학회논문집 Vol.10 No.6
As the preliminary stage for the countermeasure of thermal loading in miller cycle engine, coolant flows in the cylinder head of base engine including exhaust valve bridge were visualized and analyzed by using PIV technique. It was found that low coolant velocity regions were around exhaust valve bridge, around which stagnation of the coolant flow was observed due to the complex geometry configuration of water jacket. And velocity variation between each cylinder was remarkable. For the countermeasure of these, it is necessary to enhance coolant flow around exhaust valve bridge and to improve the deviation of coolant flow between each cylinder.
냉각수 공급방식 및 국부적인 물통로의 형상 변화에 따른 냉각수 유동특성 및 연소실 벽면의 냉각효과
위신환(Shinwhan Wei),민영대(Youngdai Min),이종태(Jongtai Lee) 한국자동차공학회 2003 한국 자동차공학회논문집 Vol.11 No.1
For the countermeasure of expected higher thermal load in miller cycle engine, coolant flows in the cylinder head of base engine with several coolant f1ow methods and drilled hole passages were measured by using PIV technique. And the cooling effect was e valuated by measurements of wall temperatures according to each coolant flow method. It was found that the series flow system was most suitable among the discussed 3 types of coolant flow methods since it had the best cooling effect in cylinder head by the fastest coolant flow velocity. It was also found that for drilled water passage to decrease the large thermal load in exhaust valve bridge, nozzle type is more effective compared with round type of water passage, and its size has to be determined according to the coolant flow pattern and velocity in each cylinder.