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flame velocity problem ?

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Old   July 27, 2018, 03:36
Default combustion ..............flame not achieving the desired velocity ?
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I am trying to replicate the simulated combustion of methane through fine tubes(16 mm dia) into a combustion chamber but in my case my flame are not attaining the desired velocity contour compared to the developed model

i dnt know where i have gone wrong.........

models used
1. species transport-volumetric- diffusion energy source- -eddy dissipation model
2. air velocity 141.75 m/s temp 566 K
3. fuel velocity 14.19 temp 295 K
4. standard k-epsilon with std wall function
6. Radiation- discrete ordinate model.

the velocity which i am supposed to get are as shown in vel actual.jpg and what i am getting is shown in vel.jpg ?


Kindly help me out guys
Attached Images
File Type: jpg vel.jpg (98.7 KB, 12 views)
File Type: jpg vel actual.jpg (54.6 KB, 13 views)

Last edited by sooraj546; July 30, 2018 at 00:39. Reason: no replies.................
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Old   July 27, 2018, 09:48
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Hi, I simulated methane combustion and I used the finite rate/ No TCI model with k-e RNG with autoignition, cause I wasnít able ti decide starting combustion parameters in the eddy dissipation model. Did you validate your combustion model with experimental data?
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Old   July 27, 2018, 09:54
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I am trying to replicate an already simulated combustion model (developed using eddy dissipation ) still i am not getting the desired velocity.

The only reason in am using eddy dissipation is because i need to validate and replicate it first

Thanks a lot for your reply ! really appreciates further comments
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Old   July 27, 2018, 10:06
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I see.. I used also inlet diffusion option, if you would like to try! Iím sorry not to be helpfull
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Old   July 27, 2018, 12:37
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i have already tried with inlet diffusion......! still nothing................. thanks a lot for replying
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combustion chamber, eddy dissipation concept, methane-air, species transport model, velocity contours

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