金属壁移动对微波加热均匀性的影响

摘要

In this paper,the phase of electromagnetic field distribution in the cavity is regulated through movements of the metal wall of a rectangular waveguide,which can avoid the inhomogeneous heating caused by the uneven distribution of electromagnetic field in the rectangular waveguide.And the time varying medium method based on space coordinate transformation is proposed to calculate the moving boundary problem,which has a significant effect on solving the moving boundary problem of large industrial microwave cavities.A single mode BJ-22 wave guide heating system is used as the reference in this paper to analyze impacts of short circuit plane position on microwave heating uniformity.Experiments and calculation results show that the uniformity of microwave heating can be greatly improved by regulating of short circuit plane position,and the space coordinate transformation method can be used to calculate the moving boundary of the microwave cavity.%本文通过矩形波导金属壁的移动,对腔体内电磁场分布的相位进行调节,从而改善矩形波导内因电磁场分布的不均匀而引起的加热不均匀性,并且提出了基于空间坐标变换的时变媒质方法来计算移动边界问题,对于处理大型工业用微波腔体的移动边界问题具有重要意义.本文采用单模BJ-22波导加热系统为基准,分析短路面位置的调节对微波加热均匀性的影响,实验和计算表明短路面的调节可以大大提高微波加热的均匀性,且空间坐标变换理论可以准确的用于微波腔体的移动边界计算.