【摘要】：氣體溫度模擬器是空間飛行器半實(shí)物仿真中的關(guān)鍵設(shè)備,為空間飛行器大氣傳感系統(tǒng)的半實(shí)物仿真提供響應(yīng)速度快、精度高的氣溫信號(hào)。隨著空間飛行器半實(shí)物仿真需求的不斷發(fā)展,對(duì)溫度模擬系統(tǒng)提出了更高的溫度模擬范圍和動(dòng)態(tài)響應(yīng)。本文通過(guò)空間飛行器在飛行過(guò)程中總溫變化進(jìn)行分析,針對(duì)溫度模擬系統(tǒng)要求的模擬溫度高、響應(yīng)速度快的特點(diǎn),提出了以高溫等離子氣體為熱源,通過(guò)高低溫氣體混合的方式來(lái)產(chǎn)生所需的高溫氣體信號(hào)。首先,對(duì)現(xiàn)有的氣體加熱高溫的方式進(jìn)行了對(duì)比,選擇了高溫等離子氣體為溫度模擬系統(tǒng)的熱源,并分析了高溫氣體在容腔內(nèi)混合過(guò)程中存在的難點(diǎn);針對(duì)相應(yīng)的難點(diǎn)設(shè)計(jì)了一種利用雙層結(jié)構(gòu)的氣體容腔來(lái)進(jìn)行高低溫氣體的混合調(diào)溫以及裝置隔熱處理。其次,對(duì)高溫等離子噴槍出口處基本參量(溫度、速度)的分布進(jìn)行了理論分析,并基于Fluent對(duì)混合容腔溫度場(chǎng)進(jìn)行了仿真研究。通過(guò)對(duì)高低溫氣體混合過(guò)程進(jìn)行數(shù)值模擬,研究了混合容腔內(nèi)的氣體溫度場(chǎng)分布特性,分析了溫度模擬裝置各參數(shù)對(duì)混合腔內(nèi)以及出口處的溫度分布的影響;驗(yàn)證了本文的溫度模擬裝置產(chǎn)生高溫氣體的能力。仿真結(jié)果表明,通過(guò)調(diào)節(jié)低溫氣體流量和加熱器功率可以實(shí)現(xiàn)900K~1400K的溫度模擬;最后,根據(jù)氣體溫度模擬的原理搭建了氣體溫度模擬系統(tǒng)的實(shí)驗(yàn)裝置,編寫(xiě)了溫度模擬系統(tǒng)的實(shí)驗(yàn)控制軟件和操作界面;對(duì)不同低溫氣體流量條件下的混合氣體溫度進(jìn)行了實(shí)驗(yàn)研究。實(shí)驗(yàn)表明所設(shè)計(jì)溫度模擬裝置和混合容腔可以達(dá)到預(yù)期的溫度模擬目標(biāo)范圍。本文的工作為空間飛行器半實(shí)物仿真中高溫氣體模擬裝置的初步研究,為后續(xù)溫度模擬系統(tǒng)的高精度控制研究奠定了良好的基礎(chǔ)。本裝置填補(bǔ)了國(guó)內(nèi)小型化高溫氣體模擬的空白,具有極大的工程應(yīng)用價(jià)值。
[Abstract]:The gas temperature simulator is the key equipment in the simulation of the space vehicle. It provides the temperature signal with fast response and high precision for the simulation of the air sensor system of the space vehicle. With the continuous development of the requirement of space vehicle hardware-in-the-loop simulation, a higher temperature simulation range and dynamic response are proposed for the temperature simulation system. In this paper, the change of total temperature of space vehicle during flight is analyzed. In view of the characteristics of high temperature and high response speed required by the temperature simulation system, the high temperature plasma gas is proposed as the heat source. A mixture of high and low temperatures is used to produce the desired high temperature gas signals. Firstly, the existing methods of heating high temperature are compared, the high temperature plasma gas is chosen as the heat source of the temperature simulation system, and the difficulties in the mixing process of high temperature gas in the cavity are analyzed. According to the corresponding difficulties, a double layer gas cavity is designed to adjust the mixture temperature of high and low temperature gas and heat insulation device. Secondly, the distribution of the basic parameters (temperature, velocity) at the outlet of the high temperature plasma spray gun is analyzed theoretically, and the temperature field of the mixing cavity is simulated based on Fluent. Through the numerical simulation of high and low temperature gas mixing process, the distribution characteristics of gas temperature field in the mixing chamber are studied, and the influence of the parameters of the temperature simulation device on the temperature distribution in the mixing chamber and at the outlet is analyzed. The ability of the temperature simulator to produce high temperature gas is verified. The simulation results show that the temperature simulation of 900K~1400K can be realized by adjusting the low temperature gas flow rate and heater power. Finally, according to the principle of gas temperature simulation, the experimental device of gas temperature simulation system is built, and the experimental control software and operating interface of the temperature simulation system are compiled. The temperature of mixed gas at different low temperature flow rate was studied experimentally. The experimental results show that the designed temperature simulation device and the mixing cavity can reach the expected temperature simulation target range. The work of this paper is a preliminary study of the high-temperature gas simulation device in the hardware-in-the-loop simulation of the space vehicle, and a good foundation for the research on the high-precision control of the subsequent temperature simulation system. The device fills up the blank of miniaturized high-temperature gas simulation in China and has great engineering application value.
【學(xué)位授予單位】：華中科技大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類(lèi)號(hào)】：V416.8

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