高强化活塞振荡冷却的场协同分析

数值模拟了高强化活塞内冷油腔中机油的振荡冷却过程,定义了有效速度的概念,通过数据处理得到了内冷油腔壁面的各场参数在时间和空间上的分布规律,分析了壁面表面传热系数与场协同性能间的联系.结果表明:在面相位为60°~120°和240°~300°范围内,场协同匹配性能较好;有效速度的分布规律与协同角余弦值的分布规律一致;内冷油腔壁面表面传热系数分布规律与协同角余弦值和有效速度的分布规律一致,表明可以使用场协同机理阐述机油振荡冷却的对流换热规律.

Field synergy analysis of highly-intensified piston oscillating cooling

The oscillating cooling process of oil in the oil cooling gallery of highly-intensified piston was simulated numerically and the effective speed was defined. Through the post processing of data, the distributions of field parameters of oil cooling gallery wall in time and space were obtained, and the connection between wall surface heat transfer coefficient and the field synergy performance was analyzed. The results show that: the field synergy performance is good enough in the space range of 60 degree to 120 degree and 240 degree to 300 degree. Distribution rules of effective speed match well with the field synergy angle cosine value; uniform distributions of surface heat transfer coefficients of oil cooling gallery wall are in accord with the distributions of synergy angle cosine value and effective speed, illustrating that field synergy mechanism can explain the convective heat transfer rules of oil oscillating cooling.