چكيده به لاتين
Nowadays, due to the environmental pollution caused by the combustion of fossil fuels, alternative and clean fuels become very important. Organic fuels, including lycopodium, have a high thermal potential; however, in order to increase the energy released in the combustion process, it is suggested to use additives such as metallic fuels. In this regard, in this research, an attempt is made to investigate the combustion of triple dust cloud of lycopodium, aluminum and zirconium. For this reason, first, a review of particle combustion and its applications is made. Then, the asymptotic and semi-asymptotic modeling of premixed combustion of particles is discussed in single and triple form. In the study of triple fuel combustion, lycopodium dust cloud as the main fuel has a lower ignition temperature than aluminum and zirconium, and quickly reacts with the oxidizer. As a result, optimal energy is provided for the combustion of metallic fuels. In this research, considering the heat loss of the system in the form of convection and radiation, the non-adiabatic combustion of triple dust cloud is modelled. Also, by applying an external disturbance to the velocity field, the fluctuating behavior of the flame is evaluated. Finally, behavior of the combustion in the edge flame and the movement path of the particles are investigated by examining the dynamic behavior in the triple fuel combustion. From the results extracted from the modeling, it is observed that by changing the diameter of zirconium particles from 10 microns to 50 microns, the flame temperature of dust cloud increases by 28%. Also, the flame temperature in triple fuel form, by adding metallic fuels, is 30% higher in comparison with single organic fuel. By comparing adiabatic and non-adiabatic combustion of dust cloud, it is shown that heat loss from the chamber wall, beside temperature reduction, leads to a 5% reduction in burning velocity.
