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하이브리드 자동차용 모터 내부의 오일 냉각 시스템에 대한 수치해석
김종수(J.S. Kim),문정욱(J.W. Moon),곽태희(T.H. Kwak),강태곤(T.G. Kang) 한국전산유체공학회 2017 한국전산유체공학회지 Vol.22 No.3
This paper presents the numerical study on the flow and heat transfer in an oil cooling system for the motor employed in a hybrid vehicle. The heat sources in the motor are identified by conducting numerical simulations for the electromagnetic field. Then, they are used as input parameters in the thermal analysis. The multiple reference frame(MRF) scheme in a commercial software, ANSYS CFX, is used to treat the rotating rotor. A separated flow model is employed to solve the non-isothermal two-phase flow of the oil-air mixture. We mainly focus on the influence of the oil injection and the fluid flow caused by rotating parts on the performance of the oil cooling system. At two typical operating points of the motor, it is found that the temperature distribution in the motor is highly affected by the injection rate of the oil. In addition, the convective heat transfer caused by the secondary flows occurring in the gap between the stator and rotor also contribute to cooling.