热处理数值模拟进展之一--扩展求解域热处理数值模拟

One of progress in heat treatment numerical simulation ——Numerical model of heat treatment with expanded solution domain

金属热处理是复杂的多场耦合非线性物理过程,本文简要归纳前人有关"耦合换热"的研究成果,在此基础上首次提出了扩展求解域的热处理模型。它将温度场的求解域扩展到加热或冷却的热处理工件及其周围环境。用壁面函数法处理流场与固体之间换热,多物体多表面之间的辐射热交换用离散坐标法处理。各物体(子域)界面上的热流密度和温度是耦合换热的计算结果而不是预设定的边界条件。避免了现有的热处理模型中预先设定工件表面的边界条件所遇到的困难和不确定性,有助于更接近于实际生产的情况。本文以新型罩式渗氮炉的设计为例,运用扩展求解域的热处理数值模拟方法成功地进行了设备虚拟设计,证明了该模型具有巨大的优越性。

This paper summarized the research about the coupled heat transfer and proposed a numerical model of heat treatment with expanded solution domain for the first time.The model solves temperature not only for heated or cooling load but also for the environment.It involves wall function to deal with the heat transfer between fluid and solid,and discrete ordinate method to deal with the radiation among multi-object and multi-surface.In the model,the heat flux and temperature on the inter surface are the middle results and not the boundary conditions.Therefore,the model is more suitable for heat treatment process.A new bell-type nitriding furnace has been introduced as an example to demonstrate the advantages of the model in heat treatment equipment design.