Settings of premixed combustion

Kenzhia3310 · March 27, 2020, 21:27

Hi, there.
Recently, I'm investigating laminar burning velocities/static temperature of air premixed flames in a bunsen configuration.
However, the result is not similar to what I expected(Shown as the diagram below). May I know what kind of improvement that I can apply in my simulation?

Static Temperature (new meshing model, patch 3000C).PNG

Here are the settings that I used in my simulation.
For meshing:
1. Around 50000 cells are using.

For boundary condition based on stoichiometric reaction (mole fraction):
1. Fuel-air velocity inlet: 0.0905 of CH4, 0.19 of O2, 0.6m/s max velocity (UDF)
2. Coflow velocity inlet: Pure nitrogen, 0.05m/s

For patching:
1. A temperature with 3000K.
Patching.PNG

Thanks for viewing.

vinerm · March 28, 2020, 15:35

The results are pretty close. It could be due to mesh. Number of cells is not important. However, the density of cells in the vicinity of vital region is very important. Look at the cells size in the region where you have flame. It appears to be large in both x and y directions.

Kenzhia3310 · March 28, 2020, 21:13

Hi, there.
I have tried several times by changing the meshing size but the results are similar to what I posted last time.

March 27, 2020, 21:27	Settings of premixed combustion	#1
Kenzhia3310 New Member Koo How Boon Join Date: Mar 2020 Posts: 13 Rep Power: 6	Hi, there. Recently, I'm investigating laminar burning velocities/static temperature of air premixed flames in a bunsen configuration. However, the result is not similar to what I expected(Shown as the diagram below). May I know what kind of improvement that I can apply in my simulation? Static Temperature (new meshing model, patch 3000C).PNG Here are the settings that I used in my simulation. For meshing: 1. Around 50000 cells are using. For boundary condition based on stoichiometric reaction (mole fraction): 1. Fuel-air velocity inlet: 0.0905 of CH4, 0.19 of O2, 0.6m/s max velocity (UDF) 2. Coflow velocity inlet: Pure nitrogen, 0.05m/s For patching: 1. A temperature with 3000K. Patching.PNG Thanks for viewing.

March 28, 2020, 15:35	Similarity in Results	#2
vinerm Senior Member Vinerm Join Date: Jun 2009 Location: Nederland Posts: 2,946 Blog Entries: 1 Rep Power: 35	The results are pretty close. It could be due to mesh. Number of cells is not important. However, the density of cells in the vicinity of vital region is very important. Look at the cells size in the region where you have flame. It appears to be large in both x and y directions. __________________ Regards, Vinerm PM to be used if and only if you do not want something to be shared publicly. PM is considered to be of the least priority.

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March 28, 2020, 21:13		#3
Kenzhia3310 New Member Koo How Boon Join Date: Mar 2020 Posts: 13 Rep Power: 6	Hi, there. I have tried several times by changing the meshing size but the results are similar to what I posted last time.