时间分辨AlO-PLIF成像技术应用

The main measurement method of AlO is emission spectrum with low-resolution in the combustion process of aluminized propellant, which cannot meet the requirement of high-resolution measurement of combustion and flow field of solid rocket engine.A time-resolved AlO-PLIF imaging technique with high spatial resolution (~10 μm) was reported.This paper used laser-induced aluminum-plasma to produce small-scale AlO groups, which was easy to achieve high-precision control in time and space, and less disturbed by other components. It could provide experimental platform with high stability and high repeatability for optimizing AlO-PLIF measurement technology.The excitation and detection mechanisms were optimized under atmospheric and low-pressure conditions, and the spatial-temporal evolutions of laser-induced high temperature AlO groups in aluminum plasma were studied, the time-resolved AlO image sequences were obtained at atmospheric pressure and low pressure of 70 Pa.The results show that the appearance time of the ground state AlO is earlier than that of the excited state AlO, but the existence time is shorter.The existence area of the AlO group is wider under the condition of low pressure, meanwhile the structure changed quickly with stronger signal intensity.The research shows that PLIF technology has great application potential in the field of combustion characteristics of aluminized solid propellants.