标题：Effect of gasoline additive on combustion and emission characteristics of an n-butanol Partially Premixed Compression Ignition engine under different parameters
摘要：Abstract The experiments were conducted on a modified two-cylinder diesel engine to investigate the effects of excess-air coefficient ( λ ) and intake temperature ( T in ) of different blending ratios (volume ratio of gasoline in the blends) on the combustion and emission characteristics of a Partially Premixed Compression Ignition (PPCI) engine. The results show that with the increase of gasoline blending ratio, the peak in-cylinder pressure ( P max ), the peak in-cylinder temperature ( T max ) and the peak heat release rate ( HRR max ) of four test fuels all increase first and then decrease. When gasoline volume fraction is 10%, HC and CO emissions are the lowest. In addition, intake temperature ( T in ) has a significant effect on the n-butanol/gasoline PPCI engine. With the increase of T in , the in-cylinder P max and HRR max of four test fuels gradually increase, the combustion phase advances and HC and CO emissions decrease, while NOx emissions increase slightly. Furthermore, as λ increases, the P max , T max and HRR max of the four test fuels show monotonously reducing trend. At the same time, mixture concentration has basically no effect on start of combustion ( CA10 ), the combustion duration ( CD ) gradually extends, and HC and CO emissions increase.
