为了深入研究丁醇同分异构体在双燃料发动机上燃烧和排放的差异，基于1台重型6缸涡轮增压柴油机，在转速1 500 r/min、缸内循环总能量1 280 J/cycle工况下，针对正丁醇柴油和异丁醇柴油双燃料的燃烧和排放特性进行了试验研究。研究结果表明：随着柴油喷射定时的提前，正丁醇-柴油和异丁醇-柴油双燃料燃烧的最大缸内压力相位、放热率峰值相位和θ_CA10提前，最大缸内压力、缸内最高平均温度和燃烧持续期增加，放热率峰值和最大压力升高率先增大后减小，HC，CO和颗粒物排放降低，而NO_x排放先增加后减少。在相同的柴油喷射定时和丁醇替代比条件下，相比于正丁醇-柴油双燃料燃烧，异丁醇-柴油双燃料燃烧的θ_CA10，θ_CA50和θ_CA90均提前，滞燃期和燃烧持续期变短，最大缸内压力、放热率峰值和最大压力升高率降低，HC和NO_x排放较高，而CO和颗粒物排放较低。

In order to further investigate the differences in combustion and emissions of butanol isomers on a dual fuel engine, the experimental study of combustion and emission characteristics was conducted on a heavy-duty 6-cylinder turbocharged diesel engine fueled with n-butanol/diesel and iso-butanol/diesel dual fuel under the condition of 1 280 J/cycle in-cylinder cycle energy at 1 500 r/min. The results show that the phases of maximum in-cylinder pressure, peak heat release rate and θ_CA10 advance, the maximum in-cylinder pressure, maximum in-cylinder mean temperature and combustion duration increase, the peak heat release rate, maximum pressure rise rate and NO_x emission first increase and then decrease, HC, CO and particle emissions reduce with the advance of diesel injection timing in the mode of n-butanol/diesel and iso-butanol/diesel dual fuel combustion. Compared with the n-butanol/diesel dual fuel, θ_CA10,θ_CA50 and θ_CA90 of iso-butanol/diesel dual fuel advance, the ignition delay and combustion duration shorten, maximum in-cylinder pressure, peak heat release rate, maximum pressure rise rate, CO and particle emissions decrease, HC and NO_x emissions increase at the premise of using the same diesel injection timing and butanol mixing ratio.