Hydrogen Combustion Mech.dat and Therm.dat files

Unknown_1981 · November 21, 2024, 12:24

The Mech.dat and Therm.dat files mentioned in CONVERGE are for the C3 mechanism. When using these files, my hydrogen is not completely burning, even though the equivalence ratio is correct. I switched to the Henry-Curran mechanism, and although hydrogen burns more completely with this mechanism compared to the C3 mechanism, it still does not burn completely. The Henry-Curran mechanism is from 2004—are there any updated Therm.dat files available for hydrogen-air combustion that I can use?

lmy_csi · November 22, 2024, 18:36

Hi, when you use C3 what species did you select? Usually we just select ammonia (with 34 species), do you use ammonia mechanism for H2 combustion, but did not see anything burnt?

-----------------------------------------------------------------------------

Mingyi Liang
Senior Research Engineer - Applications
Convergent Science
Madison, WI

Unknown_1981 · Yesterday, 06:14

In Converge Hydrogen species mechanism is present in DI-INJECTION-HYDORGEN-COMBUSTION Example case I used that Mech.dat files.not that of ammonia species one. During start of my Combustion my Hydrogen Concentration is 4.46*10^-6 it is been reduced to 2.48*10^-6 at the end,but it is not becoming 0 by the end of combustion hence the heat release rate is less, there exist many mechanism files such as C3,NUIG,Curan etc what would be better such that my combustion will be complete.

November 21, 2024, 12:24	Hydrogen Combustion Mech.dat and Therm.dat files	#1
Unknown_1981 New Member Anonymous Join Date: Sep 2024 Posts: 10 Rep Power: 2	The Mech.dat and Therm.dat files mentioned in CONVERGE are for the C3 mechanism. When using these files, my hydrogen is not completely burning, even though the equivalence ratio is correct. I switched to the Henry-Curran mechanism, and although hydrogen burns more completely with this mechanism compared to the C3 mechanism, it still does not burn completely. The Henry-Curran mechanism is from 2004—are there any updated Therm.dat files available for hydrogen-air combustion that I can use? Last edited by Unknown_1981; November 22, 2024 at 01:08.

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November 22, 2024, 18:36		#2
lmy_csi New Member Mingyi Liang Join Date: Sep 2022 Posts: 18 Rep Power: 4	Hi, when you use C3 what species did you select? Usually we just select ammonia (with 34 species), do you use ammonia mechanism for H2 combustion, but did not see anything burnt? ----------------------------------------------------------------------------- Mingyi Liang Senior Research Engineer - Applications Convergent Science Madison, WI

Yesterday, 06:14		#3
Unknown_1981 New Member Anonymous Join Date: Sep 2024 Posts: 10 Rep Power: 2	In Converge Hydrogen species mechanism is present in DI-INJECTION-HYDORGEN-COMBUSTION Example case I used that Mech.dat files.not that of ammonia species one. During start of my Combustion my Hydrogen Concentration is 4.4610^-6 it is been reduced to 2.4810^-6 at the end,but it is not becoming 0 by the end of combustion hence the heat release rate is less, there exist many mechanism files such as C3,NUIG,Curan etc what would be better such that my combustion will be complete.