基于泛函变分和变热物性的层冷传热建模  

Heat Transfer Modeling in Laminar Cooling Based on Functional Variation and Variable Thermo-physical Parameters

作　　者：陈水宣[1] 邹俊[2] 谢丹[1] 

机构地区：[1]厦门理工学院机械工程系,厦门361024 [2]浙江大学流体传动及控制国家重点实验室,杭州310027

出　　处：《重庆理工大学学报（自然科学）》2012年第1期30-35,共6页Journal of Chongqing University of Technology：Natural Science

基　　金：国家自然科学基金资助项目(51105321);厦门市科技计划项目(3502Z20113036)

摘　　要：分析板材在层冷过程中的传热,建立以热辐射和冷却水对流换热方程为边界条件的偏微分热传导模型,并基于泛函变分原理进行离散求解,获得各离散时间节点上的温度。为进一步提高该温度模型计算精度,在宝钢Gleeble热模拟实验机上测定3种碳钢样本的密度、比热容和热导率等热物性参数随温度变化的函数关系,采用最小二乘法建立回归模型,线性插值后用于温度场定量计算。此外,采用层冷实测温度反算和优化水冷、空冷换热系数,以满足模型现场长期应用的稳定性要求。结果表明,改造后层冷温度设定系统的精度能较准确地反映板材在层冷过程的温度变化,温度模型计算值与实测值吻合良好。The heat transfer of steels in laminar cooling process of hot strip mill was analyzed and partial differential models were proposed with boundary conditions of thermal radiation and cooling water convective equations.Based on the functional variation principle,the models were solved and node temperature on discrete time was obtained.To further enhance the temperature model calculation precision,thermal material properties including density,specific heat capacity and thermal conductivity were experimentally measured in Baosteel Gleeble thermal simulation equipment for three different carbon steels and the method of least squares was used to statistically derive regression models for the properties.Furthermore,the heat transfer coefficients of water and air cooling were reversely calculated and optimized based on actual measured temperature to meet the long-term stability of the application of the models.The numerical simulation and experimental results show that the setup accuracy of temperature prediction system of ROT was effectively improved.

关 键 词：层流冷却 传热模型 泛函变分 热物性参数 

分 类 号：TH137[机械工程—机械制造及自动化]