Premixed Combustion, Eddy Dissipation / Finite Rate Model, ANSYS Fluent CFD Simulation Training

Description

Description

The present problem simulates the premixed combustion in a combustion chamber by ANSYS Fluent software. In the present case, it is assumed that the fuel and air enter the chamber from one boundary and hence are considered premixed.

The geometry of the present model is two-dimensional and has been designed using Design Modeler software. We do the meshing of the present model by ANSYS Meshing software. The mesh type is Structured, and the element number is 86,002.

This CFD project is the 4th episode of the Combustion Training Course.

Premixed Combustion Methodology

The species transport model is used to model the combustion process. The one reaction methane-air mixture is selected, and the volumetric option is used to model combustion in the chamber.

Also, the Eddy Dissipation / Finite Rate model is enabled to account for the turbulence chemistry interactions. This submodel neglects the detailed kinetic mechanisms and only considers the effect of mixing on combustion.

Also, the Energy equation is On to calculate the changes in temperature due to the combustion process, and the Viscous is set as the Standard k-epsilon model.

Premixed Combustion Conclusion

After the simulation process was finished, contours such as temperature, velocity, different species’ mass fractions, and streamlines are obtained. As shown in the temperature contour, the temperature has clearly increased in the chamber indicating that the combustion has taken place.

Also, the formed secondary flows in the chamber are shown in the streamlines. These secondary flows have the role of increasing the mixing process between fuel and air and hence enhancing the combustion process.