Non-Premixed Combustion: Eddy Dissipation

Non-Premixed Combustion, Eddy Dissipation, ANSYS Fluent CFD Training

Description

This project simulates non-premixed combustion inside a combustion chamber using ANSYS Fluent, with fuel and air entering the chamber through two separate boundaries — meeting and mixing only within the chamber itself, consistent with non-premixed combustion behavior. The 2D geometry was designed in Design Modeler and meshed in ANSYS Meshing using a structured mesh totaling 63,280 elements.

Methodology

The Species Transport model is used to represent the combustion process, applying a single-step methane-air reaction with the volumetric option enabled to capture combustion throughout the chamber. Turbulence-chemistry interaction is handled using the Eddy Dissipation model. The energy equation is enabled to capture temperature changes driven by combustion, with turbulence modeled using the standard k-epsilon model.

Conclusion

The simulation results include contours of temperature, velocity, mass fractions of the various species, and streamlines. The temperature contour shows a clear rise within the chamber, confirming that combustion has taken place. The streamlines also reveal secondary flow structures forming within the chamber — these secondary flows enhance the mixing between fuel and air, thereby improving the overall combustion process.