Investigation on the Characteristics of Spray Combustion with Kerosene/Water/Ethanol

• Main Authors: Kun-Ming Chung, 鐘崑鳴
• Other Authors: 王興華
• Format: Others
• Language: zh-TW
• Published: 2011
• Online Access: http://ndltd.ncl.edu.tw/handle/54387996459003792455

碩士 === 國立臺灣大學 === 機械工程學研究所 === 99 === The experiments carried out in an open space of the experimental study of spray combustion, use kerosene as the base, respectively, mixed water and ethanol, made from the emulsion and mixed fuel. Besides, we fixed the fuel flow rate, in order to know flame behavior at different air flow rate. First, we observe the flame appearance, find out the flame color transforms from yellow to orange when water added in kerosene, at the same time, luminosity decrease. However, there is no evidence change when kerosene mixes with ethanol. No matter what fuel applies, the color of root of the flame appears partially or totally blue when the air flow rate gradually increasing. Then measuring flame height from flame appearance, find out flame height decreases when kerosene mixes with water or ethanol, moreover, the flame height decreases is larger as water add in kerosene than ethanol add in kerosene. Finally, we measure flame axial and radial temperature, at low air flow rate, emulsion fuel will increase high temperature zone because micro explosion phenomenon occur, fuel droplet erupt, increase combustion efficiency in the flame. However, under high air flow rate, the effect of micro explosion is replaced by absorption of water which exist in emulsion. Therefore, flame temperature decrease. Too much water will also reduce flame stability, so the flame is blown out by high air flow rate. Although fuel evaporation rate increase when ethanol added, there is no evidence variation in temperature, compared with kerosene.