本文選題：回旋行波管 + 輸出窗��； 參考：《電子科技大學(xué)》2015年碩士論文

【摘要】：回旋行波管是一種非常重要的高功率毫米波器件,有寬頻帶、高功率和高益等優(yōu)點(diǎn),在毫米波雷達(dá)、通訊及電子對(duì)抗、微波武器等領(lǐng)域有著廣泛的應(yīng)用前景,因而在國(guó)際國(guó)內(nèi)倍受重視。隨著回旋行波管研制技術(shù)的不斷發(fā)展,其輸出功率越來越高,工作帶寬越來越寬,工作頻率也開始向太赫茲方向滲透。輸出窗和收集極都是回旋管的重要部件,隨著管子功率的增加,微波穿過輸出窗所產(chǎn)生的耗散功率越大以及經(jīng)過注波互作用后的回旋電子轟擊收集極所產(chǎn)生的局部熱量也就越多,這嚴(yán)重影響回旋管整管的效率以及使用壽命,因此對(duì)回旋行波管輸出窗和大功率收集極設(shè)計(jì)提出了越來越高的要求。輸出系統(tǒng)以及收集極的熱性能直接影響輸出窗的功率容量和收集極收集剩余電子的能力,所以對(duì)輸出系統(tǒng)和收集極的熱分析技術(shù)的研究有著重要的意義。本文主要內(nèi)容包括以下幾個(gè)方面:1.詳細(xì)論述國(guó)內(nèi)外回旋行波管輸出窗和收集極熱分析的研究情況和發(fā)展態(tài)勢(shì),對(duì)傳熱學(xué)、有限元法、絕熱壓縮理論等基本理論做了闡述,傳熱學(xué)理論是對(duì)輸出窗熱分析的基礎(chǔ),絕熱壓縮理論是研究收集極的基礎(chǔ)。2.闡述了熱分析方法中的的兩類主要分析軟件ANSYS Workbench和CST多物理場(chǎng)仿真的基礎(chǔ)應(yīng)用,對(duì)比國(guó)內(nèi)傳統(tǒng)熱分析方法,闡述了HFSS關(guān)聯(lián)ANSYS Workbench進(jìn)行多物理場(chǎng)分析的優(yōu)點(diǎn)以及難點(diǎn)。3.編寫MATLAB程序?qū)岱治龅幕纠碚撨M(jìn)行驗(yàn)證,利用HFSS電磁仿真軟件分析輸出窗的微波傳輸特性。再通過ANSYS Workbench軟件對(duì)回旋行波管輸出窗進(jìn)行熱分析,研究窗片的溫度分布,并進(jìn)一步研究輸出窗溫度分布對(duì)輸出窗窗片熱形變、功率容量、以及應(yīng)力分布的影響。在此基礎(chǔ)上對(duì)Ka波段圓波導(dǎo)輸出窗進(jìn)行優(yōu)化,提高功率容量;并在Q波段提出一種回旋行波管寬帶高平均功率輸出窗,此種輸出窗有較高的功率容量以及較低的窗片溫度。4.利用CST設(shè)計(jì)工作室對(duì)輸出窗進(jìn)行微波仿真,分析窗片的微波傳輸特性,進(jìn)一步利用CST軟件進(jìn)行熱分析和熱應(yīng)力分析。5.針對(duì)傳統(tǒng)的大功率收集極局部過熱的問題,利用ANSYS Workbench對(duì)其結(jié)構(gòu)進(jìn)行優(yōu)化,將圓柱型收集極改進(jìn)為斜面收集極,提高收集極收集電子的密度。由于回旋管功率較高,注波互作用后的剩余電子還帶有大量的能量降落至收集極,為了降低電子轟擊收集極的耗散功率,在斜面收集極斜面段加入降壓段,采用斜面降壓收集極,降低電子轟擊收集極的耗散功率,提高收集極的功率容量。6.利用CST粒子工作室模擬電子進(jìn)入收集極的粒子軌跡,利用CST多物理場(chǎng)協(xié)同仿真,對(duì)斜面收集極和改進(jìn)后的降壓收集極進(jìn)行熱分析。首先對(duì)收集極S11,S21傳輸特性參數(shù)進(jìn)行優(yōu)化分析,最后對(duì)比分析斜面收集極與降壓收集極受電子轟擊所產(chǎn)生耗散功率和因電子轟擊所產(chǎn)生的溫升。
[Abstract]:Gyrotron traveling wave tube (TWT) is a very important high power millimeter wave device, which has the advantages of wide band, high power and high benefit. It has a wide application prospect in the fields of millimeter wave radar, communication, electronic countermeasure, microwave weapon and so on. Therefore in the international and domestic attention. With the development of gyrotron TWT technology, the output power becomes higher and higher, the working bandwidth becomes wider and wider, and the operating frequency begins to penetrate to THz. Both the output window and the collector are important components of the gyrotron, as the power of the tube increases, The higher the dissipative power generated by microwave passing through the output window and the more local heat produced by the gyrotron electron bombardment of the collector after beam-wave interaction, the greater the efficiency and service life of the gyrotron. Therefore, the design of the output window and the high power collector of the gyrotron TWT is more and more demanding. The thermal properties of the output system and the collector directly affect the power capacity of the output window and the ability of the collector to collect residual electrons, so it is of great significance to study the thermal analysis technology of the output system and the collector. The main contents of this paper include the following aspects: 1. The research situation and development trend of the output window and collecting extreme thermal analysis of gyrotron traveling wave tube at home and abroad are discussed in detail. The basic theories of heat transfer, finite element method, adiabatic compression theory and so on are expounded. The heat transfer theory is the basis of thermal analysis of the output window. Adiabatic compression theory is the basis for the study of collector. The basic application of ANSYS Workbench and CST multi-physical field simulation in thermal analysis method is described. Compared with the traditional thermal analysis method in China, the advantages and difficulties of HFSS associated ANSYS Workbench in multi-physical field analysis are expounded. The basic theory of thermal analysis is verified by MATLAB program, and the microwave transmission characteristics of output window are analyzed by HFSS electromagnetic simulation software. Then the thermal analysis of the output window of the gyrotron traveling wave tube is carried out by ANSYS Workbench software, and the temperature distribution of the window plate is studied, and the influence of the temperature distribution of the output window on the thermal deformation, power capacity and stress distribution of the output window plate is further studied. On this basis, the output window of Ka-band circular waveguide is optimized to improve the power capacity, and a wideband high average power output window of gyrotron traveling wave tube is proposed in Q band. The output window has higher power capacity and lower window temperature. The microwave simulation of the output window is carried out by CST design studio, and the microwave transmission characteristics of the window are analyzed, and the thermal analysis and thermal stress analysis are carried out by CST software. In order to solve the problem of local overheating of the traditional high power collector, the structure of the collector is optimized by ANSYS Workbench, and the cylindrical collector is improved to the oblique collector to increase the density of collecting electron. Because of the high power of gyrotron, the residual electrons after beam-wave interaction also fall to the collector with a large amount of energy. In order to reduce the dissipative power of the collector by bombardment, a depressurization section is added to the sloping plane of the collector. The sloping voltage down collector is used to reduce the dissipative power of the collector and to increase the power capacity of the collector. The CST particle studio is used to simulate the particle trajectory of electron entering the collector and the CST multi-physical field co-simulation is used to conduct thermal analysis of the inclined collector and the improved step-down collector. The transmission characteristic parameters of the collector S11 / S21 are optimized. Finally, the dissipative power and the temperature rise caused by the electron bombardment are compared between the inclined collector and the step-down collector.
【學(xué)位授予單位】：電子科技大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：TN124

【參考文獻(xiàn)】

相關(guān)碩士學(xué)位論文 前1條

1 鄭志清;回旋管電子光學(xué)系統(tǒng)的熱分析[D];電子科技大學(xué);2013年

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本文編號(hào)：2020605