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오일갤러리 유동을 고려한 디젤 엔진 피스톤 온도분포 예측
하응지(Eung-Ji Ha),문길민(Kilmin Moon),박재인(Jaein Park) 한국자동차공학회 2007 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
Control of piston temperature has become one of the important factor for a recent high power and high speed diesel engines. The temperature control for diesel engine piston is commonly achieved by piston cooling jet system with oil gallery flow. However, the oil flow and piston cooling characteristics in the oil gallery have not been understood accurately. Therefore, a numerical procedure has been developed to simulate unsteady oil flow in the piston oil gallery and to predict the piston temperature distribution with oil gallery flow. The predicted piston temperature distribution showed good agreement with measured data Parametric studies were performed to evaluate the influence of oil jet velocity, oil jet nozzle area and oil gallery exit area on the piston temperature. It is found that the average heat transfer coefficient of the oil gallery increased proportional to the amount of oil jet flow. The filling ratio of oil flow and the average piston temperature are converged as the oil flow rate increased.
김태균(Taegyun Kim),문길민(Kilmin Moon) 한국자동차공학회 2013 한국자동차공학회 부문종합 학술대회 Vol.2013 No.5
Variable valve actuation has become a very popular feature in today’s engines. With many of these systems being hydraulically actuated, the engine lubrication system requires enhancement to support their function. To expand the system’s operational range with respect to speed and temperature, a traditional solution has been to increase oil pressure by increasing pump displacement. To better optimize the system, a variable displacement vane pump has been adapted to the engine lubrication system. A pivoting outer ring design is employed that is able to vary the pump’s displacement as a function of pump regulating oil pressure which in-turn provides a net reduction in its drive torque. This paper discusses the CFD (Computational Fluid Dynamics) method by developing a dynamic force balanced model for variable displacement vane pump and also the 1-D detailed VDVP model integrating a lubrication circuit to analyze the pump power consumption over driving cycle mode.
엔진 온도 평가와 열정산을 위한 통합 열전달 해석 기술
김태균(Taegyun Kim),문길민(Kilmin Moon),송경(Kyong Song),박재인(JaeIn Park) 한국자동차공학회 2005 한국자동차공학회 춘 추계 학술대회 논문집 Vol.2005 No.11_1
The increase of power density is limited by engine temperature. Engine component temperatures are an important consideration. because it will affect material strength and lubricating performance, therefore, it is of great importance tor engine designers to estimate component temperature in the early stage of engine development. In the present work, the conjugate heat transfer analysis of calculating heat transfer between head/block solid components and coolants was used. to estimate solid component temperature distribution and heat rejection to coolant. In particular. unsteady heat transfer simulation method of Intake/exhaust valve system were developed. The calculation results were presented and compared with experimental results to confirm the validity of this methodology. It is also applied to optimize engine cooling system through thermal balance.