Week 10 - Simulating Combustion of Natural Gas.

Objective:

             To simulate the combustion in Ansys fluent with the parametric study.

Theory:

• Combustion is a chemical process during which heat energy is generated. 
• During combustion, the Hydro-carbon and Oxygen combined when a spark is introduced chemical reaction takes place and forms CO2 and H2O.
• Due to the presence of nitrogen in the atmosphere during high-temperature NOx pollutants and various pollutants will form during combustion.
• In order to reduce these pollutants, the CFD simulation will help to reduce pollutants to achieve the government norms.
• by reducing the maximum temperature and by maintaining the oxygen level in the inlet to the required level.

Combustion source calculation:

1. Finite rate chemistry 
2. Mixing based model: - The eddy dissipation model
3. Finite rate eddy dissipation model.

Geometry:

Meshing:

 since this is an axisymmetric problem  2D plane from the geometry is selected 

Capture proximity is ON to fit a number of cells near the fuel injector.

element size of 2mm

Solving:

model: K-epsilon turbulence model

Species model for combustion process:

Parametric study of varying the ratio of fuel and H2O:

Post-processing:

Part-I

five-line is created along the length to chart the various parameters

Part -II

parametric study

Conclusion:

• Thus the simulation of combustion using Ansys fluent ran successfully.
• From the above result, we can say that the formation of NOx and SOOT is reduced by adding water.