Abstract:
The role of recirculation and non-unity Lew is number on the combustion of organic dust particles were investigated. Since recirculation effect is more no ticeable in micro-combustors, it is necessary to propose a modeling approach of this phenomenon to better simulate the perform anceofmicro-combustors. In this research, in order to model the combustion of organic dust particles, it was assumed that the dust particles vaporize first to yield a known chemical structure which was oxidized in the gas phase, and the chemical structure of this gaseous fuel was assumed methane. To study the flame structure and solve the governing equations, it was considered that the flame structure consists of three zonestitled the prehea-tvaporization zone, the narrow reaction zone and finally the post flame zone. The recircu lation phenom enon was evaluated by entering the exhausted heat from the post flame zone in to the preheat zone. The solution was based on the following approach. First, the governing equations in each zone were nond imensionalized. Then the needed boundary and matching conditions were applied in each zone. A fter that, these equations and the required boundary and matching conditions were simultaneously solved with the analytical model. Consequently, the remarkable effects of recirculation and nonunity Lew is number on the combustion characteristics of the organic dust particles such as burning velocity and temperature profiles for different particle radiiare obtained. The results show reasonable agreement with published experimental data.
