基于导热特性分析的S195柴油机活塞改进设计  

A Improvement Design of S195 Diesel Engine Piston Based on Heat Transfer Characteristics Study

作　　者：林雄萍[1,2] 钟晓龙 袁嘉隆 郑捷庆 

机构地区：[1]集美大学诚毅学院,福建厦门361021 [2]福建省清洁燃烧与能源高效利用工程技术研究中心,福建厦门361021

出　　处：《集美大学学报（自然科学版）》2013年第2期124-127,共4页Journal of Jimei University：Natural Science

基　　金：福建省科技计划重点项目(2012H0031);福建省自然科学基金资助项目(2009J01261);福建省科技厅高校专项(JK2011028)

摘　　要：为有效减少柴油机活塞的热负荷,延长其使用寿命,分析了其温度场分布特性,将S195柴油机活塞头部由平直形状改进为浅ω型,并应用ANSYS有限元分析软件,采用三维有限元法,计算S195柴油机活塞在热载荷作用下的温度场和换热情况,比较了改进前后两种结构的导热特性.模拟计算结果表明:改进后活塞平直顶面温度最高值均比以前的低(除ω形凹坑的中心凸起处略高30℃左右),同时环槽区与裙部的温度也比以前低.更为重要的是,改进后的活塞顶部的温度与第一、第二环槽的温差进一步拉大,使得改进后的活塞通过环槽处的散热动力大大提升.In order to effectively reduce the heat load of diesel engine piston and extend its life,the structure of S195 diesel engine piston head was improved from a flat shape to shallow ω-shape from the view point of the analysis of its temperature distribution characteristic.The ANSYS finite element analysis software was applied to calculated the two piston.s three-dimensional temperature fields respectively.It can be found from the simulation results that the temperatures of flat top surface are higher than those of the improved one（apart from the ω-shaped pits Center raised slightly higher at around 30 ℃）,the same performance also occurs on the piston ring and the skirt areas.More importantly the temperature between the top surface and the first/second ring slots is widened after the piston structure is improved,making the heat transfer performance at the ring groove of piston improved.

关 键 词：活塞 三维有限元法 温度场 导热特性 

分 类 号：TK413.95[动力工程及工程热物理—动力机械及工程] TK124