چكيده به لاتين
Since recent decades, many scientists have interested in investigating about metallic fuels. Metallic powders can be regarded as clean and renewable fuels scince their combustion products do not cause air pollution; besides, their solid products can be recycled. What is more, their high energy densities, in camparisson with hydrocarbon fuels, make them suitable condidates for applyind widely instead of fossil fuels. Nonetheless, there are many problems to use metallic powders practically in different common applications such as energy generation in industrial areas, transportation, etc. Both the aggregration of combustion products in combustion chamber and safety issues are the two most important problems of the combustion of metallc powders. Among metallic fuels, nano aluminum particles are one of the most interesting fuels for researchers. Shedding lights on the combustion properties of nano particles leads to solve all mentioned problems of practical applications of nano particle combustion.
In this research, first, nano aluminum combustion in air with considering of conduction and radiation heat transfer mechanisms and radiation heat losses to the ambient gas was investigated. Then, the effects of both Brownian motion and particle agglomeration on combustion of nano aluminum dust clouds were studied. Also, the effect of particle diameter polydispersity on flame propogation speed was discussed. Then, the combustion of nano aluminum particles in different oxidizers such as water vapour and the exhausts of dimethyl ether combustion in air, was simulationed.
Keywords: descrete combustion, aluminum nano particles, flame propagation speed, Brownian motion, particle agglomeration, radiation heat transfer
