多組份油料與柴油液滴之燃燒行為研究

Investigation on the Burning Behavior of Multicomponent Fuel and Diesel Droplets

魏嘉興(Chia-Hsing Wei)

指導教授 ： 王興華

國立臺灣大學/工學院/機械工程學研究所/碩士(2015年)

https://doi.org/10.6342/NTU.2015.00420

摘要

本實驗主要是使用自由液滴法，觀察液滴的燃燒現象，包括:火焰顏色、火焰縮口、點火延遲、燃燒時間、燃燒速率以及微爆現象。實驗中第一部分為使用甲醇、十二醇、正己烷、正庚烷、十六烷、十八烷、丙醇等，利用油料之間不同沸點差異，預混高碳數與低碳數之純物質進行燃燒，並觀察其燃燒現象。而第二部分則為柴油預混不同比例丙酮-丁醇-乙醇(簡稱:WABE)燃燒，並觀察其燃燒現象。

實驗結果發現在混合油料中，火焰縮口的發生與高沸點組份的多寡有關，一般來說，隨著高沸點組份的增加，火焰縮口會提早發生。點火延遲也會隨著高沸點組份的增加而增長，而無論是烷類、醇類或者烷類醇類相混，都會有微爆的發生。蒸發潛熱、沸點與化學結構等都會影響物質的燃燒行為。而在柴油預混WABE的部分，加入WABE後可以使柴油液滴產生微爆現象，使燃燒時間減少，造成燃燒速率的上升，且因為加入WABE後，有效減少soot的生成。

關鍵字

液滴燃燒 ； 火焰縮口 ； 燃燒效率 ； 含水丙酮-丁醇-乙醇

並列摘要

This paper will focus on the experiment on droplets combustion behavior occurring while freely falling droplets enter the high-temperature glass tube, in which the freely falling droplets are attained by Ink-Jet printing method. During the experiment, a number of key phenomena have been observed and analyzed, including flame colors, flame shrinkage, ignition delay, burning time, burning rate, as well as micro-explosion. The experiment is mainly separated into two parts. The first is to observe the changes in combustion behavior as the blends of fuels with a variety of boiling point and carbon number are exploited, such as methanol, dodecanol, hexane, heptane, hexadecane, octadecane, and propanol. In the second part, the investigation of burning behavior with the blends of diesel-water-containing acetone-butanol-ethanol (WABE) is undertaken.
According to the experiment results, combustion behavior is influenced by latent heat of vaporization, boiling point and chemical structure. The timing of flame shrinkage occurring depends upon the variety of boiling point. There is a tendency that when the proportion of the high boiling point fuel is increased in the composition, an earlier flame shrinkage and a longer ignition delay will be obtained. An interesting finding of the experiment is that micro-explosion occurs whatsoever when burning mixed fuels. As for WABE, adding WABE to diesel fuels will trigger micro-explosion. This not only makes the burning time shorter and the burning rate increased, but also significantly reduces soot formation.

並列關鍵字

Droplets combustion ； Flame shrinkage ； Burning rate ； WABE

參考文獻

[22] 張家暟, “單一純油料及混合純油料之燃燒行為,” 國立台灣大學機械工程研究所碩士論文, 2012.

[17] 金佑勳, “多組份柴油液滴燃燒與微爆現象之研究,” 國立台灣大學機械工程研究所碩士論文, 2005.

[1] M. L. Botero, Y. Huang, D. L. Zhu, A. Molina and C. K. Law, “Synergistic Combustion of Droplets of Ethanol, Diesel and Biodiesel Mixtures,” Fuel, Vol. 94, pp. 342-347, 2011.

[2] B. J. Wood and W. A. Rosser, “An Experimental Study of Fuel Droplet Ignition,” AIAA Journal, Vol. 7, pp. 2288-2300, 1969.

[3] J. J. Sangiovanni and A. S. Kesten, “A Theoreticl and Experimental Investigation of the Ignition of the Fuel Droplets,” Combustion Science and Technology, Vol. 16, pp. 59-70, 1977.