基于场路结合的微波加热系统等效电路模型  

Equivalent circuit model of microwave heating system based on field circuit combination

作　　者：杨彪[1,2,3] 苏森涛 马亦骥 倪瑞璞 曾德明 肖青云 王银双 YANG Biao;SU Sentao;MA Yiji;NI Ruipu;ZENG Deming;XIAO Qingyun;WANG Yinshuang(Faculty of Information Engineering and Automation,Kunming University of Science and Technology,Kunming 650500,China;Yunnan Key Laboratory of Artificial Intelligence,Kunming University of Science and Technology,Kunming 650500,China;Key Laboratory of Unconventional Metallurgy of Ministry of Education,Kunming University of Science and Technology,Kunming 650093,China)

机构地区：[1]昆明理工大学信息工程与自动化学院,云南昆明650500 [2]昆明理工大学云南省人工智能重点实验室,云南昆明650500 [3]昆明理工大学非常规冶金教育部重点实验室,云南昆明650093

出　　处：《中南大学学报（自然科学版）》2023年第9期3676-3687,共12页Journal of Central South University:Science and Technology

基　　金：国家自然科学基金资助项目(61863020)。

摘　　要：研究了微波加热过程中微波与被加热媒质之间动态响应过程。在微波加热动态过程中,求解电磁热耦合多物理场方程组复杂且耗时,为此,本文提出了基于“场路结合”的微波加热等效电路分析方法。首先,定性分析微波传输过程中加热媒质、腔壁、微波馈入口介质片的阻抗特性,用阻抗特性相同的电路元件等效微波传输过程中各类介质的阻抗作用,建立微波加热系统的等效电路模型;其次,用全波场分析方法分析媒质、腔壁、微波馈入口介质片对电磁波的吸收、反射和透射作用,微波电磁场的变化用散射参数定量表示;然后,通过参数转换将定量分析得到的散射参数转换为等效电路阻抗参数,代入等效电路模型中,以提高等效电路模型计算的精确度;最后,通过等效电路计算获得微波应用器中加热媒质部分的电场强度,求出媒质耗散的微波功率,进而计算出媒质加热温度。研究结果表明:当计算微波媒质加热温度时,场路结合方法在保证计算精确度的同时计算耗时为有限元方法的一半,体现了场路结合方法的优越性。在不同条件下的微波加热媒质实例计算中,场路结合求解准确率在96%以上,验证了场路结合方法求解微波加热问题的可行性和有效性。The dynamic response process between microwave and heated medium in the process of microwave heating was studied.Solving the electromagnetic-thermal coupling multi-physics field equations is complex and time-consuming when analyzing the dynamic process of microwave heating.An equivalent circuit analysis method was proposed for microwave heating based on"field-circuit combination".Firstly,qualitative analysis was conducted on the impedance characteristics of the heating medium,cavity wall,and microwave feed inlet dielectric sheet during microwave transmission.Circuit components with the same impedance characteristics were used to equivalent the impedance effects of various media during microwave transmission.An equivalent circuit model of the microwave heating system was established.Secondly,the full wave field analysis method was used to analyze the absorption,reflection,and transmission of electromagnetic waves by media,cavity walls,and microwave feed inlet dielectric plates.The changes in microwave electromagnetic fields were quantitatively represented by scattering parameters.Thirdly,the scattering parameters obtained from quantitative analysis were converted into equivalent circuit impedance parameters through parameter transformation,which were substituted into the equivalent circuit model to improve the accuracy of the calculation of the equivalent circuit model.Finally,the electric field intensity of the heating medium in the microwave application was obtained through equivalent circuit calculation.The microwave power dissipated by the medium was obtained to calculate the heating temperature of the medium.The results show that the field circuit combination method for calculating the heating temperature of microwave media ensures calculation accuracy,and takes half of the calculation time of the finite element method,reflecting the superiority of the field circuit combination method.For microwave heating media under different conditions,the accuracy of the field circuit combination solution is over 96%,veri

关 键 词：微波加热 场路结合 等效电路模型 多物理场耦合 微波网络理论 

分 类 号：TN801[电子电信—信息与通信工程]