选择正丁醇作为助溶剂添加到乙醇-柴油中进行相溶性试验，绘制乙醇-正丁醇-柴油在不同温度下的溶解度曲线，研究正丁醇添加量和含水体积分数对混合燃料稳定性的影响。研究得到正丁醇作为乙醇-柴油混合燃料添加剂的合理添加范围：若要满足十六烷值大于40，乙醇的体积掺混比极限值为20％，此时为保持燃料混合均匀，只需加入5％的正丁醇即可。混合燃料中每多溶解0．1％体积的水，需要使温度升高20℃左右或者多添加2％正丁醇。%The mutual solubility test of blended fuel was conducted by adding n-butanol cosolvent into ethanol-diesel solution . The solubility curves of ethanol-n-butanol-diesel at different temperatures were drawn .The influence of n-butanol addition and water volume content on the stability of blended fuel was researched .Finally ,the reasonable addition of n-butanol additive to ethanol-diesel blended fuel was acquired .5% n-butanol addition could make the blended fuel uniform if the cetane number was larger than 40 and the maximum mixing volume fraction of ethanol was 20% .While the water volume content increased by 0 .1% ,the temperature of the blended fuel needed to increase by about 20 ℃ ,otherwise 2% n-butanol should be added to the solution .
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