关键词: 镁基水反应金属燃料;反应速率;反应程度;数值分析

Abstract: A model for the reaction between magnesium-based hydro-reactive fuel and vapor in broad temperature range was established.The model is focused on the two main reactions of the fuel and vapor,including the reaction of magnesium with vapor and that of carbon with vapor.The reaction model of magnesium with vapor is based on chemical dynamic or diffusion control, respectively, at different temperature range,which means the reaction is controlled by chemical dynamic at low temperature and by diffusion at high temperature.The reaction of Mg/H₂O model controlled by diffusion considers the condensation of partial gaseous MgO on the surface of magnesium droplet.The chemical dynamic equations for the reactions of Mg/H₂O and C/H₂O are based on the Arrhenius equation.The influences of some factors, such as, the mass ratio of water and the fuel and the content of magnesium, on the reaction characteristics of fuel and vapor were numerically studied.The calculated results are consistent with the experimental data.The results also show that the reaction rate and extent of fuel and vapor can be increased by greater self-sustaining combustion temperature of the fuel, suitable mass ratio of water and the fuel, higher content of magnesium powder, and so on. 

Key words: Magnesium-based hydro-reactive fuel; Reaction rate; Reaction extent; Numerical analysis