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

碩士論文
2021 - 09

碩士生: 梁晉維

畢業年分: 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(中文) / Development of laminar burning velocity measurement system in multifuel or strong oxidizer premixed flames(英文)

中文摘要: 

本研究提供一套適用於預混火焰的層流火焰速度量測系統，可以應用在混合燃氣以及強氧化劑的燃燒條件下。在當量比為0.8到1.4的範圍中，利用紋影拍攝法獲取甲烷/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。根據質量守恆定理，計算出受到拉伸的層流火焰速度。接著透過Markstein length以及用於長方形燃燒器的整體流速(Bulk velocity)的校正，將速度轉為未拉伸層流火焰速度。為了驗證提出的量測系統準確性，在甲烷/空氣的預混燃燒條件下，使用GRI 3.0反應機制的數值模擬計算一維未拉伸層流火焰速度，並與實驗結果相比。結果顯示，在當量比為0.85到1.2之間的誤差值皆小於3.8%。隨後，應用此量測系統於混合燃氣以及強氧化劑的預混火焰，檢測其對複雜的燃燒條件的計算結果，並篩選出適用於強氧化劑的反應機制。

英文摘要: 

This study presents a laminar flame speed measurement system applicable to premixed flames under conditions involving mixed fuels and strong oxidizers. Using shadowgraph imaging, the two-dimensional flame front length is captured across equivalence ratios ranging from 0.8 to 1.4, including methane/air, methane/nitrous oxide, and methane/carbon monoxide/hydrogen/air mixtures. The stretched laminar flame speed is then calculated based on the conservation of mass principle. Subsequently, the flame speed is corrected to the unstretched laminar flame speed using the Markstein length and the bulk velocity applicable to a rectangular combustion chamber.

To validate the accuracy of the proposed measurement system, numerical simulations using the GRI 3.0 reaction mechanism for methane/air premixed combustion conditions are conducted. The results show discrepancies within 3.8% for equivalence ratios ranging from 0.85 to 1.2 when compared with experimental data. Following the validation, the measurement system is applied to premixed flames involving mixed fuels and strong oxidizers. The results are used to assess the suitability of various reaction mechanisms for complex combustion conditions, aiding in identifying mechanisms appropriate for strong oxidizers.

研究成員

  • 梁晉維

指導老師

  • 李約亨

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