Biodiesel is a kind of clean and renewable energy. The effect of ethanol addition on the flame characteristics of waste oil biodiesel is studied by using OH-PLIF technique from the perspective of OH radical evolution. Ethanol addition leads to the appearance of diffusion flame reaction interface ahead of schedule and shortens the diffusion flame height. The experimental results show a linear correlation between the flame height and the fuel flow rate for a given fuel and oxidant. The same conclusion is drawn from the theoretical analysis of the approximate model. In addition, ethanol addition makes the average OH signal intensity of flame at different fuel flow rate tend to be consistent and the fuel flow rate enlarge where the flame field shows the strongest oxidation performance. Average OH signal intensity begins to weaken at larger fuel flow rate, which indicates that fuel flow rate of fuels blended with ethanol can change in larger range and does not significantly affect the uniformity of combustion.%生物柴油是一种清洁可再生能源.本文应用OH-PLIF技术从OH自由基演化的角度研究了乙醇添加对地沟油生物柴油燃烧火焰特性的影响.添加乙醇会使扩散火焰反应界面前移,同时会降低扩散火焰高度.在燃料和氧化剂给定的情况下,试验和理论分析都表明燃油流率和火焰高度呈线性关系.添加乙醇会使火焰平均OH信号强度在火焰中分布更为均匀,且在燃油流率较大时火焰才会呈现出较强的氧化性.当燃油流率较大时,平均OH信号强度开始减弱,表明在地沟油生物柴油中添加乙醇时,燃油流率可在较大的燃油流率内变化,而不明显影响火焰均匀性.
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