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中南大学学报(自然科学版)

Journal of Central South University

第48卷    第8期    总第276期    2017年8月

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文章编号:1672-7207(2017)08-2224-07
结构参数对闭式内冷油腔填充率的影响
邓立君1,王志明1,刘永启2

(1. 山东大学 能源与动力工程学院,山东 济南,250061; 2. 山东理工大学 交通与车辆工程学院,山东 淄博,255049)

摘 要: 为了研究内冷油腔结构参数及内冷油腔位置对填充率的影响,利用计算流体力学对内冷油腔内两相流的控制方程进行求解,并通过活塞内冷油腔进出油流量动态实验对模拟结果进行验证。研究结果表明:随着内冷油腔进出口截面积、内冷油腔进出油孔的长度和喷嘴流量的变化,内冷油腔的填充率分别呈现不同的变化;内冷油腔位置上移使得内冷油腔填充率增大,传热系数反而减小。在不同的曲轴转角下,内冷油腔的填充率不同,内冷油腔的传热系数也随之呈现相同的变化趋势,并在爆发压力工况对应的曲轴转角时达到最大。

 

关键字: 内冷油腔;两相流;填充率;传热系数

Effect of structural parameters on fill ratio of closed cooling gallery
DENG Lijun1, WANG Zhiming1, LIU Yongqi2

1. School of Energy & Power Engineering, Shandong University, Jinan 250061, China; 2. School of Traffic & Vehicle Engineering, Shandong University of Technology, Zibo 255049, China

Abstract:To study the influence of the structural parameters of the oil cooling gallery and the position change of the oil cooling gallery on the filling ratio, the control equation of two phase flow was solved by computational fluid dynamics (CFD), and the simulation results were validated against the special experiment results of the flow of the oil cooling gallery in the piston. The investigation shows that with the change of the cross-sectional area of the import and export of oil cooling gallery, the changes in the length of import and export oil hole, the nozzle flow rate, and the fill ratio of oil cooling gallery are different. The upward displacement of the oil cooling gallery position leads to the increase in the fill ratio and the decrease in the heat transfer of oil cooling gallery. The results also show that the fill ratio and the heat transfer coefficient of oil cooling gallery are influenced by the crank angles, and these two parameters have the same trend of change with the crank angle, and meanwhile, reach the maximum value in the maximum peak pressure condition.

 

Key words: cooling gallery; two phase flow; fill ratio; oil heat transfer

中南大学学报(自然科学版)
  ISSN 1672-7207
CN 43-1426/N
ZDXZAC
中南大学学报(英文版)
  ISSN 2095-2899
CN 43-1516/TB
JCSTFT
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