多模微波加热腔电场剧变条件研究

Study the condition of dramatic changes of electric field in multimode microwave heating cavity

在多模腔中实现均匀加热较为困难但极其重要,而电场的特性对能否实现均匀加热起决定性作用.研究多模腔电场产生剧变的条件,对于改善微波加热均匀性有积极意义.本文从亥姆赫兹方程出发,利用并矢格林函数,得到了腔体内电场的积分方程;然后,通过此方程讨论并得到电场稳定性的主要影响因素和特点;最后,在运用有限元法验证多模腔电场特性的基础上,进一步得到导致电场产生剧变的各参数的最小变化量.

Heating uniformity is important but difficult to achieve, and it is highly dependent on the characteristics of electric field. Hence, it is significant to study the condition of dramatic changes of elec- tric field in multimode cavity. In this paper, firstly, Helmholtz equation and dyadic Green＇s function are used to derive the integral equation. Then, by discussing the characteristics of the derived equation, the authors obtain the main factors and characteristics of its stability. Finally, the conclusion is verified by finite element method, and the smallest change of parameter that results in dramatic changes of electric field is presented.