Combustion in Flownex can be considered as the ability to determine the amount of heat added to a system due to a calculated air/fuel ratio in the working fluid within Flownex. Flownex can then also be used for the prediction of the flow and temperature distribution and pressure losses across the combustion chamber.

Combustion functionality in Flownex does not calculate the flue gas composition after combustion; however this is possible to calculate and assign the exhaust gas composition with a user defined script component.

If we consider a combustion chamber with multiple air lines and a fuel injection line, Flownex will calculate the fuel fraction throughout the combustion chamber and intern the temperature distribution over the chamber. This gives the user the ability to ensure accurate simulation of temperature distribution throughout the combustion chamber and intern see the effect the combustion has on the air flow. It is also possible to calculate conduction, convection and radiation heat transfer from the combustion chamber to external components or atmosphere.

Typical Applications:

In Flownex the combustion modelling functionality can typically be used to model:

• Air flow and temperature distribution in aircraft combustion chambers.
• Simulation of multiple air and fuel lines in a combustion chamber, taking into account the continuous mixing of the air fuel mixture with more fresh air or a second stream of fuel with different combustion characteristics.
• Heat transfer from a combustion chamber to external components or atmosphere.