考虑磁控管不稳定性的微波徳拜介质加热  

Microwave heating for Debye media considering instability of magnetron

作　　者：张文聪[1] 黄卡玛[1] 

机构地区：[1]四川大学电子信息学院,成都610065

出　　处：《四川大学学报（自然科学版）》2014年第5期983-990,共8页Journal of Sichuan University(Natural Science Edition)

基　　金：973国家重点基础研究发展计划(2013CB328900)

摘　　要：实际工作中的磁控管输出微波的功率,相位和频率均是不稳定的.本文采用有限元(FEM)计算方法,结合蛙跳技术首次模拟了考虑磁控管不稳定性时微波对矩形谐振腔中徳拜介质的加热.结果表明,磁控管的不稳定性会严重影响到微波对矩形谐振腔体中徳拜介质的加热,尤其是被加热的介质物理尺寸较小的时候这种影响更为明显.磁控管的不稳定性还会影响到微波加热的可重复性,因此在设计微波化学反应器,计算以磁控管作为微波源的微波加热时必须要考虑磁控管的不稳定性.本文建议在研究微波化学反应机理时采用稳定性更好的固态源.Microwaves generated by magnetron have unstable power, frequency and phase characteristics in working condition. What we have done in this article is utilizing the Finite Element Method （FEM） combined with frog leaping technique to simulate the microwave heating process on Debye media in a rec- tangular resonant cavity considering the instability of magnetron. The results show the instability of magnetron can affect the temperature rise and distribution of Debye media seriously in the rectangular resonant cavity, especially for the smaller size media. The instability of magnetron can also lower the re- peatability of microwave heating. So the instability of magnetron must be taken into account when we calculate microwave heating using magnetron as microwave source and design microwave chemical reac- tors. The solid state microwave source which has higher stability is suggested to be used in the research on microwave chemical reaction mechanism.

关 键 词：多物理场计算 微波加热 有限元法 不稳定性 数值模拟 

分 类 号：TN015[电子电信—物理电子学] TQ9[化学工程]