一种大功率连续波磁控管的高频电磁场与热应力场耦合分析

The Coupling Analysis of High Frequency Electromagnetic Field and Thermal Stress Field of a High-power Continuous Wave Magnetron

关键词:  磁控管  谐振系统  热应力  隔模带  耦合分析

Key words:  magnetron  resonant system  thermal stress  strap  coupling analysis

摘要:

本文发展一种应用于大功率连续波磁控管腔体的高频电磁场-热应力场耦合分析方法。首先，采用等效电路理论与数值仿真方法研究一种大功率连续波磁控管谐振系统在无隔模带、单环隔模带和双环隔模带情形下的工作模式、谐振频率和品质因数的内在关系；其次，对扇形和扇槽形阳极叶片的温度分布进行理论推导。研究发现，隔模带能够提高谐振系统的模式分隔能力，但也会增大损耗、降低品质因数；再者，通过对比不同冷却条件下谐振系统的热应力、形变、温度和谐振频率，设计出满足30 kW连续波输出磁控管散热的冷却水路和相匹配的冷却条件；最后，结合二者得到阳极叶片温度与π工作模式谐振频率间的对应关系并给出磁控管的热漂移曲线。

Abstract:

In this paper,an analysis method coupled high frequency electromagnetic filed with thermal stress field for a high-power continuous wave magnetron resonant cavity is developed.First of all,the internal relationship of working mode,resonant frequency and quality factor of a high-power continuous microwave magnetron resonant system is studied under no-strapped,single-strapped and double-strapped conditions with the equivalent circuit theory and numerical simulation method.Secondly,the temperature distribution of fan and fan-slot shaped anode is theoretically derived.It is found that the strap can improve the mode separation ability of the resonant system,but it also increases the loss and reduces the quality factor.Furthermore,the cooling channel with the matched cooling conditions is designed for the heat dissipation of a 30 kW continuous wave magnetron by the comparison of the thermal stress,displacement,temperature and resonant frequency under different cooling conditions.Finally,by combining the previous analysis,the corresponding relationship between the anode blade temperature and the resonant frequency under π mode is studied,and the thermal drift curve of the magnetron is given.