碩士生: 梁晉維
畢業年月: 2021年9月
論文名稱: 建置適用於混合燃氣及強氧化劑之層流火焰速度量測系統 / Development of laminar burning velocity measurement systems in multifuel or strong oxidizer premixed flames
中文摘要:
本研究建立適用於混合燃料與強氧化劑預混火焰的層流火焰速度量測系統。在當量比0.8至1.4下，以紋影法拍攝甲烷/空氣、甲烷/一氧化二氮及甲烷/一氧化碳/氫氣/空氣的二維火焰面長度，依質量守恆求得受拉伸的火焰速度，再透過Markstein長度與長方形燃燒器的整體流速校正為未拉伸層流火焰速度。與GRI 3.0機制的甲烷/空氣模擬相比，當量比0.85至1.2間誤差小於3.8%。其後將系統應用於複雜燃料與氧化劑組合，並藉由量測結果篩選適用於強氧化劑條件的反應機制，以改進燃燒模擬。
英文摘要:
This thesis develops a laminar flame speed measurement system for premixed flames of mixed fuels and strong oxidizers. Shadowgraph imaging captures two-dimensional flame front lengths for methane/air, methane/nitrous oxide, and methane/carbon monoxide/hydrogen/air mixtures at equivalence ratios of 0.8 to 1.4. Stretched flame speeds are obtained from mass conservation and corrected to unstretched values using the Markstein length and the bulk velocity in a rectangular chamber. Against GRI 3.0 simulations of methane/air, discrepancies stay within 3.8% for equivalence ratios of 0.85 to 1.2. The system is then applied to complex fuel-oxidizer mixtures, and the data are used to assess which reaction mechanisms suit strong-oxidizer conditions, supporting better combustion modeling.
