當今常見的燃燒排放系統，例如飛機引擎和柴油發動機，都仰賴擴散火焰來實現其高效的運行。為減輕這些系統的煙灰排放，需要對層流擴散火焰中，燃料組成到煙灰的物化途徑有著基本的認知。本研究之目的在於，利用對沖擴散火焰對本實驗室生產之再生航空燃油（Hydro-processed Renewable Jet, HRJ）及氫化柴油（Hydro-processed Renewable Diesel, HRD）進行燃燒後煙灰生成的研究，藉此取得燃油的煙灰體積分率（Soot volume fraction, SVF），並與當今常見的航空燃油與柴油作比較，再利用ASTM D1322的煙點標準測試法，對煙灰生成趨勢進行結果比對。煙點測試的反向趨勢更加證實煙灰生成趨勢的可信度。從航空燃油獲得的煙灰生成趨勢，可以看出JP-5 > Jet A-1 > HRJ；而柴油的煙灰生成趨勢則為傳統柴油 > 氫化柴油 > 生質柴油。接著比較燃油組成物的區別對煙灰生成的影響，發現燃油中的芳香族含量與煙灰生成一致，證實該物質對煙灰生成量有著一定的影響。

Combustion emission systems nowadays, such as aircraft engines and diesel engines, depend diffusion flames to achieve their efficient operation. In order to reduce the soot emission from these systems, it is necessary to have the understanding of physical and chemical pathways from fuel compositions to soot in laminar diffusion flames. The purpose of this research is using counterflow diffusion flames to study the soot formation from homemade Hydro-processed Renewable Jet (HRJ) and Hydro-processed Renewable Diesel (HRD), and obtains the soot volume fraction (SVF) from the fuels to compare with conventional aviation fuel and diesel. ASTM D1322, the standard smoke point test method was used to verify the results of the soot formation trend. The reverse trend of the smoke point test further confirmed the soot formation tendency. From the soot formation of aviation fuel, it could be seen that JP-5 > Jet A-1 > HRJ; while the soot formation of diesel was conventional diesel > HRD > biodiesel. Then, we compared the influence of fuel composition difference on soot formation, and found that the aromatic content in the fuel was consistent with soot formation, confirming that this substance had a significant influence on soot formation.

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