臺灣博碩士論文加值系統

　　推進劑聯胺推進器已普遍應用於人造衛星上，當作小型推力來源，用來進行衛星姿態控制及軌道轉換。然而，在公開之文獻上，目前有關單推進劑聯胺推進器之研究報告，僅止於實驗方面之研究，尚缺乏利用電腦模擬之科學化分析方法。因此，本研究建立一可完整分析單推進劑聯胺推進器之模擬分析程式。其中包括聯胺之噴注霧化模式、聯胺解離反應模式、觸媒多孔性介質流體傳輸模式及高溫氣體推進模式。並以此模擬程式研究探討單推進劑聯胺推進器之參數，對反應室壓力、溫度、及成分濃度分佈等流場特性之影響。由模擬結果發現，觸媒床長度越短，因氨分解率降低，反應室溫度反而較高，燃燒室壓力亦跟著升高。模擬結果亦發現，聯胺與觸媒床間之交互作用，如滲透率，對反應特性有相當重要之影響。此研究有助於了解單推進劑聯胺推進器噴注參數及觸媒結構對推進效率之影響，因此，可用以引導單推進劑聯胺推進器之設計及測試，以得到最佳之推進性能。

　　Monopropellant hydrazine thruster has been widely used as the low-thrust power source for attitude control and on-orbit maneuvering of satellites. However, most related studies published in the open literature are mainly experimental. Little has been reported by systematic analyses using computer simulation. In the present study, a numerical simulation code is developed for the analysis of the three-dimensional reacting flow of a monopropellant hydrazine thruster. The code accounts for the comprehensive phenomena, including the spray injection of hydrazine, the decomposition of hydrazine, the porous fluid transport through catalyst bed, and the high-temperature gas expansion in a nozzle. A sensitivity study for the effect of the thruster parameters on the pressure, temperature, and species concentration distributions of the reactor has been conducted. The results obtained from the numerical simulation show that the chamber temperature and pressure increase with a shorter catalyst bed, due to a lower ammonia dissociation rate. The results also reveal that the interaction between hydrazine and the catalyst bed, such as the liquid permeability, has significant influences on the reaction characteristics. The present results can lead to the understanding of the influences of spray parameters and catalyst-bed configurations on the thruster propulsion efficiency, helping the design and testing of a monopropellant hydrazine thruster toward the best performance.

中文摘要.....................................................Ⅰ
Abstract.....................................................Ⅱ
致謝.........................................................Ⅲ
目錄.........................................................Ⅳ
表目錄.......................................................Ⅵ
圖目錄.......................................................Ⅶ
符號說明.....................................................Ⅸ
第一章　　導論................................................1
　　　　§1-1前言..............................................1
　　　　§1-2文獻回顧..........................................4
　　　　§1-3研究動機.........................................10
第二章　　數學及物理模式.....................................11
　　　　§2-1聯胺推進器之物理現象.............................11
　　　　§2-2基本假設.........................................12
　　　　§2-3數學模式.........................................13
第三章　　數值方法及格點系統.................................29
　　　　§3-1簡介.............................................29
　　　　§3-2計算程序.........................................29
　　　　§3-3格點系統.........................................31
第四章　結果與討論...........................................32
　　　　§4-1噴霧條件及實驗結果比較...........................33
　　　　§4-2霧化液滴與多孔性介質間之影響.....................34
　　　　§4-3改變觸媒床幾何形狀對推進器燃燒室之影響...........35
　　　　　　4-3-1、燃燒室溫度壓力分佈........................36
　　　　　　4-3-2、聯胺氣體分佈..............................38
　　　　　　4-3-3、氨氣體分佈................................39
第五章　結論與未來工作.......................................40
參考文獻.....................................................43
自述.........................................................69

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