【摘要】 基于一台自行搭建的光学可视化的定容燃烧弹系统，研究了喷油持续期(3.0、6.0和8.6 ms)、喷油压力(30、40和50 MPa)和环境温度(880、910和940 K)对正丁醇喷雾火焰的影响．采用火焰自发光高速成像技术揭示了火焰发展过程和燃烧特性．结果表明：正丁醇喷雾火焰整体呈现黄白色火焰，喷雾上游存在少量淡蓝色火焰．较小喷油持续期(3.0 ms)下，正丁醇着火后存在局部火焰熄灭现象．随着喷油持续期增加，碳烟浮起长度缩短，火焰亮度、滞燃期和燃烧持续期均增加．随着喷油压力增加，火焰亮度和火焰回溯现象减弱，碳烟浮起长度增加，同时火焰滞燃期延长但燃烧持续期缩短．环境温度显著影响正丁醇喷雾火焰的稳定着火，环境温度仅增加60 K，滞燃期显著缩短4.16 ms，同时火焰亮度明显增强且火焰形态更为稳定．更多还原

【Abstract】 Based on a self-built optically visualized constant volume combustion chamber system,the effects of injection duration(3.0,6.0,8.6 ms),injection pressure(30,40,50 MPa),and ambient temperature(880,910,940 K) on n-butanol spray flame were studied. The flame development process and combustion characteristics were revealed by flame self-illumination high-speed imaging method. Results show that the n-butanol spray flame shows a yellow-white flame as a whole,and there is a small amount of light blue flame upstream of the spray. Under small injection duration(3.0 ms),a partial flame-quenching phenomenon presents after n-butanol ignites. As injection duration increases,the soot lift-off length shortens,and the flame brightness,ignition delay and combustion duration increase. As injection pressure increases,the flame brightness and flame backtracking phenomenon weaken,and the soot lift-off length increases. At the same time,the ignition delay is prolonged,but the combustion duration is shortened. The ambient temperature has a significant effect on the stable ignition of nbutanol spray flame. With an increase in ambient temperature of only 60 K,the ignition delay of n-butanol spray flame is notably shortened by 4.16 ms,while the flame brightness is obviously enhanced and the flame shape is more stable.更多还原