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October 27, 2023, 07:59 |
Displacement Combustion in cfx
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#1 |
Member
Meysam
Join Date: Dec 2019
Posts: 81
Rep Power: 6 |
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, |
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October 27, 2023, 08:10 |
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#2 |
Senior Member
Gert-Jan
Join Date: Oct 2012
Location: Europe
Posts: 1,835
Rep Power: 27 |
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? |
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October 27, 2023, 08:18 |
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#3 | |
Member
Meysam
Join Date: Dec 2019
Posts: 81
Rep Power: 6 |
Quote:
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 |
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October 27, 2023, 23:23 |
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#4 |
Super Moderator
Glenn Horrocks
Join Date: Mar 2009
Location: Sydney, Australia
Posts: 17,716
Rep Power: 143 |
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.
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Note: I do not answer CFD questions by PM. CFD questions should be posted on the forum. |
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October 31, 2023, 02:49 |
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#5 | |
Member
Meysam
Join Date: Dec 2019
Posts: 81
Rep Power: 6 |
Quote:
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, |
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October 31, 2023, 04:54 |
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#6 |
Super Moderator
Glenn Horrocks
Join Date: Mar 2009
Location: Sydney, Australia
Posts: 17,716
Rep Power: 143 |
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.
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Note: I do not answer CFD questions by PM. CFD questions should be posted on the forum. |
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