本文選題：矩形諧振腔 + 電場分布　； 參考：《云南師范大學》2015年碩士論文

【摘要】：微波加熱具有速度快、效率高、均勻性好、穿透性強、可選擇性等獨特的優(yōu)點,被廣泛的應用于生產(chǎn)和生活中。微波加熱效率和均勻性是衡量微波反應器優(yōu)劣的重要標準。不同材料和不同尺寸的加熱對象在反應腔中將影響電磁場分布,進而出現(xiàn)不同的加熱效率和均勻性。因此,探索加載不同加熱對象時微波反應腔內(nèi)的電磁場分布規(guī)律有助于微波反應器的優(yōu)化設(shè)計�；诟哳l電磁仿真軟件HFSS,本文分析研究了一種高功率矩形微波反應器加載不同材料、不同形狀負載時的加熱效率及均勻性,主要工作概況如下:概述分析了微波加熱器的理論基礎(chǔ),包括介質(zhì)的極化、微波加熱原理及特點、微波在介質(zhì)中的傳輸、矩形諧振腔理論、微擾理論、有限元理論及HFSS在微波加熱器設(shè)計中的應用。利用HFSS電磁仿真軟件,在選定微波反應腔尺寸的基礎(chǔ)上,仿真分析了加載粉煤灰和玻璃材料時饋口角度、饋口長度、饋口距離、負載尺寸、距腔體底面距離等設(shè)計參數(shù)對加熱效率的影響。研究結(jié)果顯示:(1)負載為圓柱體、長方體和球體時,對粉煤灰負載,饋口夾角分別為162?、102?、82?時加熱效率最高,對玻璃材料負載,饋口夾角分別為134?、60?、174?時加熱效率最高;(2)當饋口長度超過50mm后其對加熱效率的影響基本保持不變;(3)加載粉煤灰時,饋口距腔體頂面中心距離在60mm~70mm之間加熱效率相對較高,加載玻璃材料時,饋口距腔體頂面中心距離對圓柱體、長方體、球體取值分別為44mm、104mm、63mm時加熱效率最高;(4)圓柱體和長方體形狀的兩種負載厚度在110mm附近均出現(xiàn)較高的加熱效率,球體形狀的粉煤灰和玻璃材料負載半徑分別在60mm和95mm附近出現(xiàn)較高的加熱效率;(5)加載粉煤灰時,圓柱體和長方體負載在距腔體底面0~20mm之間,球體負載在50mm附近均出現(xiàn)較高的加熱效率,加載玻璃材料時,圓柱體和球體負載距腔體底面距離在10~20mm之間加熱效率較高,而長方體負載則為35mm、75mm時加熱效率較高。經(jīng)優(yōu)化后,加載粉煤灰時,圓柱體和長方體負載的加熱效率均超過98%,最高達99.7%,球體負載加熱效率達88.82%;加載玻璃材料時,加熱效率均超過90%,最高達96.38%。在兼顧加熱效率的前提下,亦研究了饋口數(shù)量對加熱均勻性的影響。對于粉煤灰材料,增加饋口數(shù)量可以獲得更均勻的電磁能量場分布;對于玻璃材料,增加饋口數(shù)量反而導致較差的加熱均勻性。
[Abstract]:Microwave heating has been widely used in production and life because of its advantages such as high speed, high efficiency, good uniformity, strong penetration and selectivity. Microwave heating efficiency and uniformity are important standards to evaluate microwave reactor. Different materials and different sizes of heating objects will affect the distribution of electromagnetic field in the reaction chamber, and then the heating efficiency and uniformity will be different. Therefore, it is helpful to optimize the design of microwave reactor to explore the electromagnetic field distribution in microwave reaction cavity under different heating conditions. Based on high frequency electromagnetic simulation software HFSS, the heating efficiency and uniformity of a high power rectangular microwave reactor loaded with different materials and different shapes were studied. The main work is summarized as follows: the theoretical basis of microwave heater is summarized and analyzed, including the polarization of medium, the principle and characteristics of microwave heating, the transmission of microwave in medium, the theory of rectangular resonator, the theory of perturbation, Finite element theory and application of HFSS in microwave heater design. Using HFSS electromagnetic simulation software, on the basis of selecting the size of microwave reaction cavity, the feed angle, feed port length, feed port distance, load size when fly ash and glass material are loaded are simulated and analyzed. The effect of design parameters such as distance from bottom surface of cavity on heating efficiency. The results show that when the load is cylindrical, cuboid and sphere, the feed angle of the fly ash load is 162U 102U 82U? Time heating efficiency is the highest, for the glass material load, the feed angle of the feed port is 134U 60 / 174? When the length of feed port exceeds 50mm, its effect on heating efficiency remains basically unchanged. When fly ash is loaded, the heating efficiency between the feed port and the top surface of the cavity is relatively high between 60mm~70mm and 60mm~70mm, and when the glass material is loaded, the heating efficiency between the feed port and the top surface of the cavity is relatively high. When the heating efficiency of cylinder, cuboid and sphere is 44mm / 104mm / 63mm, respectively) the load thickness of cylinder and cuboid shape has higher heating efficiency in the vicinity of 110mm, while the distance from the feed port to the center of the top surface of the cavity is 44mm / 104mm / 63mm, respectively. When the loading radius of ball shaped fly ash and glass material appears high heating efficiency near 60mm and 95mm respectively, the cylinder and cuboid load are between the bottom surface of the cavity 0~20mm, when the fly ash is loaded with fly ash. The heating efficiency of the spherical load is higher near 50mm. When the glass material is loaded, the heating efficiency between the cylinder and the spherical load is higher between the 10~20mm and the bottom surface of the cavity, while the cuboid load is 35mm / 75mm, and the heating efficiency is higher than that of the cuboid load (35mm / 75mm). After optimization, the heating efficiency of cylinder and cuboid load is over 98 when fly ash is loaded, the highest heating efficiency is 99.7and the heating efficiency of spherical load is 88.82. When the glass material is loaded, the heating efficiency is more than 90, and the highest is 96.388.When the fly ash is loaded with fly ash, the heating efficiency of the cylinder and cuboid is more than 98, the highest is 99.7 and 88.82 respectively. On the premise of taking into account the heating efficiency, the effect of the number of feed ports on the heating uniformity is also studied. For the fly ash material, the more uniform electromagnetic energy field distribution can be obtained by increasing the number of feed ports, and for the glass material, the worse heating uniformity can be caused by increasing the number of feed ports.
【學位授予單位】：云南師范大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：TM924.76

【參考文獻】

相關(guān)期刊論文 前1條

1 高建平;矩形微波諧振腔單模諧振條件[J];沈陽航空工業(yè)學院學報;2001年03期

，

本文編號：1828135