Displacement Combustion in cfx
 

Hi,

I would like to cause a delay in my combustion. I know through the Combution Model (Eddy Dissipation), when the air and gas meet each other automatically, the combustion happens. And there is also a possibility, through the Extinction Temperature temperature, to prevent combustion beyond the specific temperature.

What is another possibility to shift the combustion?

For example, 2 cm above the surface of the burner.

regards,

You can create a volume above the burner and turn off combustion there. In Pre, I expect you need to select the option "Disable Constant Physics".

It however looks like a weird work around to get matching results. What are you trying to achieve?

I would like to simulate a combution but through experience I know the ignition happen 2 cm above the sieve of the burnner.

I hope there is a way to model it.

tanx

It is much better to generate flow conditions and physics such that the flame ends up where it is meant to be, rather than having inaccurate flow and physics which then require you to force the flame to be in the correct location.

In other words - if the flame is in the wrong location then your simulation is inaccurate and you should fix the inaccuracy. When your simulation is accurate then the flame will be in the right spot all by itself.

Hello Ghorrocks,

I am not sure that I got your meaning. However, when the combustion is fully mixed, by the simulation of Eddy Dissipation Model, when the air and gas meet each other, they start burning.

It means that an igniter is not necessary.


regards,

I do not understand what you are saying, or what you are trying to do. Can you explain what you are trying to do, what you are currently getting and what you want to get with your simulation? Also include details of your simulation - the output file would be good.