Research on the effect of cavitation on fuel atomization characteristics by molecular dynamics simulation

Abstract

The atomization characteristic of fuel is an important factor that affects the combustion stability of aero-gas turbine engine, and is of great significance to the safe operation of aircraft. By means of molecular dynamics simulation, the advantages and disadvantages of cavitation on fuel atomization process are analyzed from the point of view of molecular mechanics and molecular motion, and the influence of cavitation intensity on fuel atomization characteristics is revealed. The results show that when the cavitation intensity ranges from 0% and 5%, the cavitation is helpful to improve the atomization characteristics of fuel. Especially when the cavitation intensity is up to 3%, the dispersion of fuel droplets is the best. However, with the increase of the cavitation intensity, the pressure and energy of fuel decrease sharply, and the breakup, spray penetration and dispersion of fuel become worse, which leads to the deterioration of fuel atomization characteristics.