空氣對流場中水滴對生質柴油油滴燃燒特性之影響

Effects of a Water Droplet on the Combustion Characteristics of a Biodiesel Droplet Burning in Air Flows

黃俊賢(Jiunn-Shyan Huang)

《燃燒季刊》 78期 (2012/08) Pp. 56-66

https://doi.org/10.30041/CQ.201208.0005

摘要

The effects of a leading water droplet on the flame configurations and burning rates of a trailing biodiesel droplet burning in air flows are investigated experimentally. The studied parameters consist of Reynolds number (Re) and droplet spacing (d). The obtained results illustrate that the flame configurations of an isolated biodiesel droplet without a leading water droplet are an envelope flame at Re≦151 and a wake flame Re＞151. At a lower Reynolds number, Re=86, the flame configuration of a burning biodiesel droplet with a leading water droplet always exhibits as an envelope flame in various droplet spacing. The burning rates are found to be depressed as the droplet spacing is decreased. For a higher Reynolds number, Re=173, the flame configuration behaves as a wake flame at large droplet spacing and an envelope flame at small droplet spacing. The burning rates are found to enhance as the droplet spacing is decreased. On the other hand, the combustion characteristics of a trailing biodiesel droplet behave like a single droplet when the droplet spacing is large enough.

關鍵字

環包火焰 ； 尾火焰 ； 液滴間距

並列摘要

The effects of a leading water droplet on the flame configurations and burning rates of a trailing biodiesel droplet burning in air flows are investigated experimentally. The studied parameters consist of Reynolds number (Re) and droplet spacing (d). The obtained results illustrate that the flame configurations of an isolated biodiesel droplet without a leading water droplet are an envelope flame at Re≦151 and a wake flame Re＞151. At a lower Reynolds number, Re=86, the flame configuration of a burning biodiesel droplet with a leading water droplet always exhibits as an envelope flame in various droplet spacing. The burning rates are found to be depressed as the droplet spacing is decreased. For a higher Reynolds number, Re=173, the flame configuration behaves as a wake flame at large droplet spacing and an envelope flame at small droplet spacing. The burning rates are found to enhance as the droplet spacing is decreased. On the other hand, the combustion characteristics of a trailing biodiesel droplet behave like a single droplet when the droplet spacing is large enough.

並列關鍵字

Envelope flame ； wake flame ； droplet spacing