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研究生:劉猷華
研究生(外文):You-Hua Liu
論文名稱:等當量比之丙烷/氧氣在震波管中的點火延遲觀察
論文名稱(外文):Shocktube Observation of the Ignition Delay for Stoichiometric Propane/ Oxygen Mixtures
指導教授:袁曉峰袁曉峰引用關係
指導教授(外文):Tony Yuan
學位類別:碩士
校院名稱:國立成功大學
系所名稱:航空太空工程學系碩博士班
學門:工程學門
學類:機械工程學類
論文種類:學術論文
論文出版年:2002
畢業學年度:90
語文別:中文
論文頁數:54
中文關鍵詞:點火延遲丙烷震波管
外文關鍵詞:propaneignitionshock-tube
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本論文應用雷射吸收光譜偵測氫氧自由基(OH Radical)濃度的變化,以進行甲烷與丙烷在等當量比時的點火延遲現象觀察。實驗方法是利用震波管瞬時壓縮加熱CH4/O2/Ar與C3H8/O2/Ar二種混合氣,使其燃燒產生OH自由基,並觀察環狀染料雷射(Ring-Dye Laser)所產生之單頻紫外光(310.213 nm)被OH自由基吸收的情形,並以此定義本實驗點火延遲時間。希望藉由丙烷點火延遲觀察,更能瞭解丙烷燃燒現象與反應動力特性。

本實驗中燃氣(甲烷、丙烷)與氧氣在等當量比混合後,經氬氣稀釋為實驗氣體,混合濃度為0.45%、0.225%、0.15%,實驗溫度1450 K~2150K,壓力為1及3大氣壓。實驗結果顯示在同溫同壓下,丙烷點火延遲時間遠較甲烷為短,期間差異約略在一個級數(Order)。就丙烷而言,點火延遲時間隨溫度、濃度、壓力增加而縮短,在高溫(1600K以上)高壓情況下尤其顯著。實驗結果與文獻經驗式預測值相差甚大;分析顯示經驗式未考慮點火延遲時間之壓力影響,顯示文獻經驗式仍需進一步修正;實驗結果分析亦顯示點火反應機構隨壓力變化而改變。

從反應動力初步分析,推測在高溫高壓環境下,丙烷點火由於氫原子的直接釋出而由C3H8 + M iC3H7 + M C3H6 + M 反應途徑之反應速率所控制。隨溫度壓力降低,C3H8 + M CH3 + C2H5 + M 及C3H8 + M nC3H7 + M CH3 + C2H6 + M 等反應途徑釋出之C/H活性基所誘發之鏈分岐,亦漸影響丙烷之點火延遲現象。
The ignition delay of CH4/O2 and C3H8/O2 stoichiometric mixtures diluted in argon have been studied in shock tube by laser absorption spectroscopy of OH radical at temperatures 1450K~2150K and pressures 1~3atm. The results showed the ignition delay time of propane mixtures were an order of magnitude shorter than that of methane mixtures at the same temperature and pressure. For propane ignition delay observation, the delay time was shortened as the concentration and the pressure increased. The analysis also showed the pseudo activation energy for propane ignition increased with pressure, which indicated the key reaction path for propane ignition changes when pressure was changed. One possible interpretation of pressure effect is that the dissociation of propane follows C3H8 + M iC3H7 + M C3H6 + M at higher pressures. At lower pressures, the other propane dissociation paths C3H8 + M CH3 + C2H5 + M and C3H8 + M nC3H7 + M CH3 + C2H6 + M participate the ignition process and resulting a slower ignition. The above presumption requires verification by detailed kinetic modeling with an adequate propane oxidation mechanism.
摘要 Ⅰ
英文摘要 Ⅲ
目錄 Ⅳ
表目錄 Ⅵ
圖目錄 Ⅶ
符號說明 Ⅸ
第一章 緒論 1
1-1 前言 1
1-2 研究動機與目的 2
1-3 文獻回顧 2
第二章 實驗設計和理論 7
2-1 實驗設計 7
2-2 震波管理論 8
2-2 雷射吸收光譜 9
第三章 實驗設備和方法 11
3-1 震波管設備 11
3-2 光學偵測系統 12
3-3 反應起始時間與點火延遲時間的定義 15
3-4 時間常數之修正 16
第四章 實驗結果與分析討論 19
4-1 甲烷與丙烷比較 19
4-2 溫度影響 20
4-3 濃度影響 20
4-4 壓力影響 21
4-5 碳或氫原子數目相同時的比較 22
4-5 反應動力初步分析 23
第五章 結論與建議 25
5-1 結論 25
5-2 建議及未來研究方向 26
參考文獻 28
表 32
圖 38
附錄 50
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