为了对比研究丁醇同分异构体与柴油混合燃料的喷雾燃烧特性，评估各同分异构体作为柴油替代燃料的潜力，在定容燃烧弹可视化光学试验研究平台上，利用高速摄像机和缸压传感器，分别研究了不同环境温度和氧浓度下，丁醇同分异构体柴油混合燃料的喷雾与燃烧火焰的发展过程以及燃烧放热过程。丁醇同分异构体-柴油混合燃料的放热规律几乎相同，仅当温度降低至800 K时，正丁醇表现出较明显的差异，与其他混合燃料相比，当氧浓度较高时，其燃烧相位明显提前，放热速率峰值升高；在氧浓度较低时，变化规律相反。燃烧火焰形状和发展过程相似，但在发展时刻上略有不同。当环境温度和氧浓度较高时，火焰举升高度接近，当温度较低时，正丁醇混合燃料的火焰举升高度明显升高，表现出较低的火焰强度，这有利于炭烟的降低。丁醇同分异构体柴油混合燃料的燃烧放热和火焰发光特性相近，但低温环境下，正丁醇的炭烟降低潜力更大。

In order to investigate the spray combustion characteristics of the blends of butanol isomer and diesel and evaluate the practical application potential of different butanol isomers as diesel alternative fuel, a high speed camera was used to record flame developing process and the transient pressure sensor was used to record in-cylinder pressure to reveal combustion heat release rate under differnet ambient temperatures and oxygen concentrations for butanol isomer-diesel blends on an optical and visual test platform of constant volume bomb. These blends exhibited similar heat release law except at the temperature of lower than 800 K. In that condition, the combustion phase of n-butanol blends advanced significantly and its heat release peak increased at high oxygen concentration and they both changed in the opposite direction at low oxygen concentration. They showed the similar flame shape and developing process, but had slight difference in propagation timing. The flame lift-off length for them was almost the same at high ambient temperature and oxygen concentration and that of n-butanol blends increased obviously with showing the weak flame intensity at low temperature, which was beneficial to reduce soot emission. The butanol isomerdiesel blends exhibited similar heat release and flame developing characteristics, but n-butanol blends showed stronger potential on soot reduction as diesel alternative fuel at low temperature.