内燃机燃烧室耦合零件系统过渡工况的传热模拟  

Study on Heat Transfer of Coupling 3-D Component System in Combustion Chamber Under Transient Operating Conditions

作　　者：杨万里[1] 陈国华[2] 陈燕[1] 王春发[2] 

机构地区：[1]三峡大学机械与材料学院,湖北宜昌443002 [2]华中科技大学能源与动力工程学院,湖北武汉430074

出　　处：《内燃机学报》2003年第2期161-166,共6页Transactions of Csice

摘　　要：内燃机的起动、停车或加载过程会引起燃烧室零件的急剧加热或冷却,从而导致零件温度场发生剧烈变化,在零件表面产生远远高于静态应力的动态热应力或准静态热应力,造成高温零件的疲劳失效。为了求解燃烧室耦合三维零件系统过渡工况的非稳态温度分布,建立了相应的耦合传热数学和物理模型,并在此基础上建立了复杂运动边界上单元的有限元离散理论,该理论是耦合三维零件系统过渡工况计算机数值分析的基础。The changing operating conditions such as starting, stopping and loading operational conditions, will heat or cool the components within the combustion chamber violently, which results in steep temperature transients in the component system. The steep temperature transients produce thermoelastic dynamic stresses which are larger than the quasisteady stresses and result in the failure of the components. In order to study the distribution of the nonsteady temperature, the corresponding mathematic and physical models for the system are established and the complex finite element theory for the element on the moving boundary conditions is developed. The theory is the basis for the computer simulation of the coupling 3D heat transfer of the system under the transient operational conditions.

关 键 词：内燃机 燃烧室耦合零件 过渡工况 传热模拟 3-D耦合系统 

分 类 号：TK401[动力工程及工程热物理—动力机械及工程]