【作者】 张月红；

【导师】 沈锦飞；

【作者基本信息】 江南大学 ， 电力电子与电力传动， 2008， 硕士

【摘要】 本文主要研究感应加热器内被加热钢坯温度分布的数值模拟。感应加热是利用工件中涡流的焦耳效应将工件加热,这种加热方式具有效率高、控制精确、污染少等特点,在工业生产中得到了广泛的应用。如何设置加热过程的参数使之满足被加热工件中各项性能要求是普遍关注的问题。工件的诸多性能指标与热处理过程中的温度分布是密切相关的,然而基于实验的系统设计方法却耗时费力,并且温度测量成本高,传感器的引入还会影响本来的温度分布。因此,数值模拟技术对于这类系统的设计和研究具有重要意义。本文从感应加热的有关原理和电磁一热耦合场计算的有限元方法着手,以电磁学和传热学为基础,对感应加热电磁场和温度场分布进行了理论推导,给出了电磁场、温度场分布的数学模型及相应的有限元分析模型。其中,电磁场的数学模型由A ?φ法建立,电磁场和温度场的有限元离散化方程组由伽辽金加权余量法导出。根据数值模拟的基本理论,本文在比较ANSYS有限元软件中两种耦合场分析方法的基础上,选择了顺序耦合方法。并对圆柱形45号钢样件建立了相应的电磁一热耦合分析的数学、物理有限元模型;对加热过程的温度场分布进行模拟,得到感应加热温度场的分布图。并分析了感应加热参数对模拟结果的影响,得出了一些具有工程借鉴意义的结论,为合理选择加热参数提供理论依据。通过数值模拟的结果与实验测试所得的结果相比较,证明数值数拟的结果达到了工艺上的准确性,可应用于生产实际。更多还原

【Abstract】 This paper mainly do research for the numerical simulation of temperature distribution of metal billet in induction heating. The induction heating process generates heat by means of Joule effect resulting from an eddy current , it is widely used in industrial operations due to its high efficiency,precise control and low pollution properties .It is an impotrant problem to control each parameters of the induction heating system to ensure that every properties of metal billet are reasonable.In fact,some properties are linked to temperature distribution in heat treatment process,However,the design of an induction heating system based on experiments would be tedious and time-consuming.Furthermore,temperature measurements are expensive and the induction of sensors often results in perturbing the phenomena. Therefore, numerical simulation seems a well-adapted tool for the design and the investigation of induction heating system.Based on the Electromagnetics theory and Thermal theory,it constructed the mathematic analysis models of electromagnetic field and temperature field. The mathematical model of electromagnetic field are established by A ?φmethod.Then it deduced the finite element discretization equations of electromagnetic field and temperature field by Galarkin weighted residual method.According to the basic principle of numerical simulation, the sequential anlaysis method is selected as the main method to solve the problem of the Electromagnetic-Thermal coupled field by comparing and analysing two coupled field methods offered by ANSYS. The uniform EFM model of eddy current field and temperature field is set on 45# steel .The induction magnetic field and the transient temperature distribution is obtained by means of calculation for heating process. The influence of the technical parameters on the induction heating simulation result is analyzed.,and some referential conclusions are drawed.On the basis of these conclusions, induction heating parameter will be chosen correctly in the design of the induction heating system.At last,it proved that the result of simulation is correct by means of comparing with the result of experiment, numerical simulation seems a well-adapted tool for the design and the investigation of induction heating system.更多还原