The Research On Simulation Method For The Microwave Heating Of Moving Objects And Its Application

As one of the most important applications of microwave energy,microwave heating has many advantages such as high efficiency,environmental friendliness,and selective heating.In recent years,microwave ovens have entered thousands of households as a common kitchen appliance.However,the traditional microwave oven development still follows the "design-sample-test-correct" cycle,resulting in shortcomings such as a long research and development cycle,high cost,and high labor consumption.With the development of modern computer technology,electromagnetic simulation software,as an effective calculation tool,has played an important role in the development of microwave ovens.Using electromagnetic simulation software to simulate the model can effectively indicate the direction of microwave oven improvement,save research and development costs,and shorten the time to market.However,The process of microwave heating food not only includes electromagnetic wave absorption and heat conduction,but also is often accompanied by the movement of heating materials or electromagnetic stirrers that are artificially designed to improve the uniformity of microwave heating.The mathematical model is very complicated.In order to solve this problem,this paper combines the advantages and disadvantages of a variety of numerical simulation methods for microwave heating of moving objects,establishes a fast and accurate simulation method,and applies it to the optimization design of microwave ovens.The main research results and innovations of this paper include:(1)A fast,effective,and convenient numerical simulation method is established for solving microwave heating of moving objects.By adding a program for updating the dielectric parameters on the basis of the traditional discrete numerical simulation algorithm,the dielectric parameters of the materials are kept updated in real time.At the same time,by rotating the cavity instead of the material in the opposite direction of the rotation direction,the error generated when the internal temperature of the material is inherited is effectively avoided.In order to verify the efficiency and accuracy,the proposed method is compared with any Lagrange-Euler algorithm.The results show that for the same microwave oven model,the accuracy of the proposed method and the arbitrary Lagrangian-Euler method is almost the same,but the calculation time is reduced by about 90%.(2)Using the simulation method established in this paper,the effect of the rotation speed of the turntable on the microwave heating of two samples with different shapes(cuboid and cylinder)was systematically studied.The results show that when the turntable rotates at a speed of 5 rpm(a rotation speed commonly used in household microwave ovens),the heating efficiency of the microwave oven is higher and the heating uniformity is better.(3)Aiming at the reciprocating translation of the heating materials in the microwave cavity,the simulation method established in this paper systematically studied the influence of the translation distance,mode and speed on the heating efficiency and heating uniformity of the microwave oven.The results show that when the translation distance is 60 mm and the translation speed is 40 mm/s,the microwave heating uniformity is the best,and the microwave heating uniformity can be effectively improved by combining rotation and translation.