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March 17, 2023, 02:08
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reactingFoam_NH3-ignition
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#1 |
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New Member
Join Date: Feb 2022
Posts: 4
Rep Power: 5  |
Dear all,
I am doing simulation for NH3/H2/air combustion using OpenFOAM-8 (Foundation ver.) with reactingFoam solver. There is no run time error detected, however I failed to achieve sustainable flame. The boundary condition is based on successful experiment [1] so I don't think that specifying fuel/oxidizer composition beyond NH3/H2 flammability range is causing this ignition failure. I also conducted similar simulation by adding NH3 on steady H2 combustion with same chemical mechanism proposed by Okafor at al. [2] The generated flame is sustainable which indicated by steady consumption of NH3. From this observation, I deduce that the problem lies on numerical side specifically mesh. I need to get the flame ignited in my simulation so I could validate the results with experimental data. Any help would be greatly appreciated. Attached with this message are: 1) Animation of failed ignition simulation 2) Animation of sustainable flame (different mesh) 3) Case that could be used to reproduce the failed ignition. Already tested for both series and parallel run. NH3-TNF.zip Failed_H2-NH3-O2.zip sus-flame_H2-NH3-O2.zip Regards, Waluyo Refereces: [1] Tang, H., Yang, C., Wang, G., Krishna, Y., Guiberti, T. F., Roberts, W. L., & Magnotti, G. (2022). Scalar structure in turbulent non-premixed NH3/H2/N2 jet flames at elevated pressure using Raman spectroscopy. Combustion and Flame, 244. [2] Okafor, E. C., Naito, Y., Colson, S., Ichikawa, A., Kudo, T., Hayakawa, A., & Kobayashi, H. (2018). Experimental and numerical study of the laminar burning velocity of CH4–NH3–air premixed flames. Combustion and Flame, 187, 185–198. https://doi.org/10.1016/j.combustflame.2017.09.002 |
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September 13, 2023, 10:46
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#2 |
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New Member
mingyang
Join Date: Jul 2023
Posts: 3
Rep Power: 3 |
As far as I know, OpenFOAM-8 is a physical property file without NH3, is it a problem for you to write the file yourself? Please upload the NH3 file to me for a look.
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September 15, 2023, 01:45
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#3 | |
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New Member
Join Date: Feb 2022
Posts: 4
Rep Power: 5 |
Dear Yang,
Thank you for your reply, I really appreciate it. In OpenFOAM-8, reacting flow simulation is supported by using reactingFoam solver. I have uploaded the case (NH3-TNF.zip), which contains initial and boundary conditions of chemical species, including NH3 in 0.orig/NH3. In case you want to check on NH3 file directly, I will attach it here: NH3.txt The information regarding thermophysical properties of individual species can be found in constant/foam_mech/modGRI.fmth The information regarding chemical reactions in this simulation can be found in constant/foam_mech/modGRI.fmr Thank you for checking my case. Best regards, Waluyo Quote:
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February 10, 2024, 05:37
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#4 |
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New Member
Hafiz Ahmad
Join Date: May 2019
Location: Brunei
Posts: 22
Rep Power: 7 |
Hi RWaluyo, did you manage to fix your issue? I am simulating the similar case and have failed to achieve a sustainable flame.
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October 15, 2024, 21:20
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#5 |
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New Member
Join Date: Feb 2022
Posts: 4
Rep Power: 5 |
No, I have not been able to do it.
Perhaps I need to stop. |
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