Droplet Breakup Effects on Liquid Fuel Detonation*

This talk aims to explore the effects of droplet breakup phenomenon in multiphase detonation through the results of 2D simulations. Two breakup models, one based on wave model and another based on experimental correlation, are used to simulate n-dodecane/oxygen detonation in hydrodynamics code FLASH where, droplets are simulated as point particles with two-way coupled interaction with gas. Induction time parameter model combined with Arrhenius rate of fuel consumption is used to model the reaction. The effect of these breakup models on different sized monodispersed and polydispersed droplets are studied. The spatial inhomogeneity caused by particle size distribution causes the detonation wave to slow down compared to the gaseous detonation. In addition, the cells behind the detonation front show very different size and structure depending on the breakup model used. Variation of fuel vapor production rate for different sized droplets under both models, its effect on cellular structure and wave propagation speed is presented.