Combustion is one of the most important chemical reactions in nature and industry, which has attracted particular attention from the beginning. Wood burning is the first combustion that man has used to generate energy. Discrete phase combustion is also considered by engineers and is one of the methods used to increase combustion efficiency.
This model, called the Discrete Phase Model, is used in cases such as the entry and exit of particles in the solution space or chemical reaction materials during the process.
In this project, we tried to simulate and analyze the discrete phase wood combustion using the discrete phase model (DPM) in the ANSYS Fluent software.
The geometry required for combustion analysis of wood using the discrete phase model consists of a combustion chamber, which the geometry is designed in the Gambit software and the meshing is done by the same software for this geometry. The meshing generated for this geometry is unstructured and the total number of cells created for this geometry is 1108.
For combustion process analysis, the Species Non-Premixed Combustion model has been used in this project. In this model, a mixture of wood particles was used as a discrete phase, and the air was used for combustion. Radiation model P1 is used to investigate the combustion radiation. This mixture is specified in the Fluent Software Material part. To determine the variation of the density in terms of temperature, the ideal gas is used for state equation. The k-epsilon standard turbulence viscosity model is used to analyze the turbulence of the flow generated by the interaction of fuel and air. The standard wall function is used near the wall. It should be noted that the Discrete Phase Model was used as Interaction with Continuous Phase. The energy equation is also activated.
Materials used in this analysis also include oxygen, carbon, and water vapor and so on, which are defined in the Material section for this analysis.
The flow input for this analysis is defined as Mass Flow Inlet for input air and is equal to 0.0007955 kg/s. The air temperature is also considered to be 300 K. For input fuel flow, the Mass Flow Inlet boundary condition was used, and 0.00011661 kg/s at a temperature of 300 K. Output of the flow is also considered as a pressure outlet for the combustion mixture. The wall of the combustion chamber is defined as Wall and is described as insulation.
The Simple algorithm is used to solve the equations in this analysis. Also, a pressure-based solution for flow is used. The First Order Upwind method has been used for discretization of equations. The Second Order Upwind method is used for discretization of energy, momentum, and fuel and pollution equations.
Finally, the results are shown as contours of velocity, pressure, and temperature.
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