爆震波作用下煤油液滴破碎蒸发和火焰形态的数值模拟

Numerical investigation was conducted with VOF (volume of fluid) multiphase flow model and RNG (re-normalization group) k-ε turbulence model to explore the effects of detonation waves on the breakup，evaporation，and combustion characteristics of RP-3 kerosene droplets. Through adjusting the initial pressures (20，30，40 kPa) under different equivalence ratios (0.8 to 1.2)，the evolution of the droplet breakup morphology，characteristics of evaporation，and flame shape were obtained. The results indicated that， under the detonation wave， the main stages of the evolution of RP-3 kerosene droplet breakup can be categorized into the wrinkling，squeezing，development，and the stable period according to the characteristics of the droplet morphology. The evaporation characteristics of the droplet were relatively less influenced by the Weber number，the linear relationship between windward displacement S and We was fitted，with the liquid phase mass fraction remaining within the range of 41% to 56% before the breakup morphological profile was stabilized. The liquid-phase evaporation rate increased over time and then gradually decreased. As the Weber number increased，the rate of displacement growth on the windward side of the droplet decreased，while the rate of flattening accelerated. During the combustion process，the "pinch" flame became more compact and penetrated deeper. The size and curvature of the swirling flame also gradually increased，and irregular fully enveloping flame shapes became more complex.