Laser ignition and combustion characteristics of Al/JP-10 nanofluid droplet

A CO2 laser ignition system was used to ignite the pure JP-10 (endo-Tetrahydrodicyclopentadiene, C10H16) and aluminum (Al)/JP-10 nanofluid droplet. Online combustion diagnosis and combustion residue analysis were combined to study the effect of solid content and atmosphere on the ignition and combustion characteristics of the Al/JP-10 nanofluid droplet. The combustion process of JP-10 can be divided into three stages, namely, ignition, steady burning, and extinguishment, while the combustion process of Al/JP-10 nanofluid can be divided into four stages, namely, ignition, mixed burning, mass burning, and extinguishment. Aluminum nanoparticles can effectively improve the volume calorific value of fuel. With the increase in solid content, the ignition time of the droplet is significantly shortened and the combustion intensity is increased. However, the increase of solid content introduces particle agglomeration problems, which decreases the oxidation degree of Al nanoparticles. Compared with air, the intensity of droplet combustion increases significantly in oxygen atmosphere. The highest combustion temperature of the fuel droplet with a solid content of 10% reached 1843 degrees C, the oxidation efficiency of the residues increased significantly, and the combustion efficiency of aluminum particles reached 99.26%.