激光下纳米铝癸烷液滴蒸发特性的实验研究

To investigate the application of aluminum nano-particles (Al NPs) as high-energy additives in hydrocarbon fuels，experiments were conducted using n-decane，oleic acid (OA)，and Al NPs as fuel，surfactant，and metal additive，respectively，to prepare single n-Al/decane droplet. The effects of Al NPs mass fraction (1%—15%) and laser power (9.1—100.0 W) on the droplet evaporation and combustion characteristics were studied under infrared laser excitation at a wavelength of 1 064 nm. The results showed that the addition of Al NPs significantly accelerated droplet evaporation and resulted in micro-explosions and combustion phenomena. Micro-explosions were the key to ignite the n-Al/decane droplet. The ejected Al NPs were ignited by laser in the air，forming a flame that promoted the combustion of fuel droplet. By increasing the laser power and aluminum content， the temperature rise of droplet can be accelerated and the frequency of micro-explosions can be increased，thereby improving the evaporation rate of droplet. As the mass fraction of Al NPs increased from 2.5% to 15%，the ignition sensitivity of droplet was significantly enhanced，and the minimum laser power required to ignite droplet was reduced from 83.3 W to 28.0 W.