船用大功率柴油机组合式活塞热结构耦合分析及温度场预测  

Thermo-structure Coupling Analysis and Temperature Field Forecast of a Composite Piston in Marine Large Power Diesel Engine

作　　者：钟伟 刘金星 李全 

机构地区：[1]海军驻七一一所军代表室,上海201108 [2]七一一研究所,上海201108

出　　处：《柴油机》2014年第5期24-27,32,共5页Diesel Engine

摘　　要：通过建立柴油机组合式活塞的3D有限元模型,以文献中相似机型的实测缸套温度为温度边界条件,根据相应经验公式取得各换热区的对流换热系数,对新设计的组合式活塞进行了温度场预测;基于温度场计算结果及活塞所受结构应力,对该活塞进行了热-结构耦合强度及疲劳寿命分析。分析结果表明:该活塞设计较合理,整体安全系数均大于1.5。A 3D finite element model of a composite piston in diesel engine was set up. The temperature data of similar engines got from literatures was defined as the temperature boundary conditions. And the convection heat transfer coefficients （ HTC） on the surface of the piston was obtained through empirical formula. All the above analysis results are used to forecast the temperature field of the new designed com-posite piston. Then based on the temperature field calculation results and the structural stress suffered by the piston, the thermo-structure coupling and fatigue analysis are carried out on this new designed piston. The analysis results show that the design of this piston is rational and the safety coefficients of different parts are all above 1. 5 .

关 键 词：组合活塞 热-结构耦合分析 疲劳寿命 

分 类 号：U664.121[交通运输工程—船舶及航道工程]