- 學位論文
多組份碰撞混合液滴燃燒研究
An Experimental Investigation on The Burning Characteristics of Collision-Merged Multiple Fuel Droplets
摘要
本實驗使用n-Hexadecane（C16H34）與甲醇、乙醇、丙醇，並在其中加入不同比例的添加劑，其中可粗分為可溶和不可溶；以Ink-Jet printing method產生雙向自由液滴，經空中撞擊後，形成多組份互混或不互混單顆液滴，再落入高溫環境中加熱，使其燃燒，觀察點火延遲，燃燒速率，火焰縮口，微爆現象等燃燒特性；並和前人的資料作比對。 實驗中烷類(n-Hexadecane)與醇類(Methanol，Ethanol，Propanol)對撞為主；以正十六烷與甲醇而言，在不改變結合比例的情況下，改變液滴的結合尺寸，觀察對燃燒所造成的影響。結果發現對燃燒效率而言，在所做的範圍裡，結合液滴越大，燃燒效率越高。在可互溶油料方面，在正十六烷對甲醇與丙醇預混中發現，燃燒時火焰焰色是由三種油料所混合，而燃燒效率隨著甲醇預混量增加而越大；而在正十六烷對乙醇與MTBE預混中發現，當加入預混的MTBE量越多時，因MTBE為強溶劑，混合液滴會呈現互溶狀態而出現火焰縮口。而在加入乳化劑span80與tween80方面，正十六烷與span80預混會使的微爆趨勢變弱；而甲醇與tween80預混會使的微爆變弱，也可證明均勻成核的微爆理論。
並列摘要
Experiment applies Ink-Jet Printing method to generate dual free droplet streams and collided along their path as they fall. Then the collided droplets will fall into the combustion chamber freely and some collision states and burning characteristics are investigated. We use n-hexadecane, methanol, ethanol, and propanol in the first part of this experiment, and then use hexadecane and ethanol-MTBE(or beneze)-premixture in the second part. Then we will compare the results of these two parts. According to our experiment results, the combustion states of non-mixable n-hexadecane/methanol droplets is always micro-explosion in adhesive mode. The occurrence of micro-explosion will increase burning rate. In discussion on the n-hexadecane and methanol, we find strong micro-explosion and the zone of micro-explosion in 40%~90% in n-hexadecane volume ratio probably. In the second part of this experiment, we find that if we join the MTBE or beneze of the suitable volume ratio, can increase burning state. But if we join too much MTBE or beneze, it will make immiscible droplets become to multiple miscible droplets.