关键词: 动力机械工程, 乙醇, 燃烧, 均质压燃, 循环变动

Abstract: The cyclebycycle variations of the ethanol homogeneous charge compression ignition (HCCI) combustion have been investigated in a single cylinder engine modified from a CA6110 diesel engine. The experiment results show that as the air/fuel ratio increases, all of the cyclebycycle variations of the maximum pressure, the mean indicated pressure, and the combustion duration period increase, but the stand deviation of start of combustion (SOC) decreases. As the intake charge temperature rises, the maximum pressure increases, but the mean indicated pressure increases firstly and then drops, and their cyclebycycle variations decrease; the cyclebycycle variation of the SOC increases, and combustion duration period shortens, its variation decreases. Proper amount EGR inducted can dramatically enhance the combustion rate and decrease the pressure rise rate, but too much EGR would result in unstable even intermittent combustion.

Key words: power machinery and engineering, ethanol, combustion, HCCI, cyclebycycle variation