Multiphysics Simulation Of Multi-feed Microwave Heating Cavity

As an indispensable part of microwave heating equipment,microwave heating cavity is generally used in domestic microwave ovens and commercial microwave heating equipment.The traditional microwave heating cavity is generally provided with a single feeding port because it is used in a domestic microwave oven,so it is difficult to improve the uniformity of microwave heating.However,in the field of commercial microwave heating equipment,the microwave heating cavity usually needs to be designed with multiple feeds due to the requirements of power and improvement of microwave heating uniformity.It is of great significance to study the distribution of the feeds in the multi-feed microwave heating cavity.At the same time,with the rapid development of semiconductor technology,breakthroughs have been made in high-power solid-state microwave sources in recent years,which has prompted the application of solid-state microwave sources to gradually expand to the field of microwave heating.Design offers new ideas.In this thesis,the simulation research of single-feed and double-feed microwave heating cavity and multi-feed microwave heating system is mainly carried out,and the following work is completed by combining multi-physics simulation and experiment method:1.The structure simplification of the single-feed and double-feed microwave heating cavity is completed by HFSS software.At the same time,the microwave antenna design suitable for single-feed and double-feed microwave heating cavities was completed.Then,the optimal size scheme of the microwave antenna for the single-feed microwave heating cavity was selected for processing and testing.The test results show that the design is inverse.The F antenna basically meets the requirements of subsequent thermal testing experiments.2.Using ANSYS Workbench software,the electromagnetic thermal simulation research of single-feed and double-feed microwave heating cavity was carried out respectively.Taking 5 cups of water load as the research object,the corresponding electromagnetic thermal simulation research was completed for the single-fed and double-fed microwave heating cavity respectively.The microwave heating cavity has more advantages.Then,the heating test experiment of the single-feed microwave heating cavity was completed.In the experimental results,except the individual water load temperature results were slightly worse than the simulation results,the rest of the water load temperature results were roughly consistent with the simulation results.3.Based on the research of single-feed and double-feed microwave heating cavities,a microwave heating system model with 18 feeds was established after simplifying the model with HFSS software,and beef was used as the load to study the effect of feeder spacing distribution on the reflection parameters and The influence of coupling parameters and electric field distribution in the cavity shows that the uniform distribution of feeder spacing is better than the uneven distribution of feeder spacing.Then,using ANSYS Workbench software to conduct electromagnetic thermal simulation research on the multi-feed microwave heating system,by simulating different states of the conveyor belt to study its influence on the temperature distribution of beef,it is found that the conveyor belt has little effect on the temperature distribution of beef when it is in motion.4.The single choke incisor tooth structure and double choke incisor tooth structure of the microwave heating cavity are designed by HFSS.After the simulation and optimization of the single choke incisor tooth structure,the prototype is processed according to the simulated structure.and the feasibility of the designed single choke incisor structure was verified by the microwave leakage test experiment.