soot mixture fraction

aravind vashista · September 14, 2020, 06:02

Hi,
I am modeling methane - air non premixed swirl flame. I am using non-premixed flamelet approach along with soot using one step method. I know that fuel mixture fraction at fuel inlet is 1. but what is soot mixture fraction at fuel inlet and air inlet respectively. I hope I will get valuable suggestions in this regard.

thank you

lei · September 20, 2020, 17:59

Hi ARAVIND, you do not need to assign any soot mole fraction in the fuel and air inlet, or just assign 0 because soot is only formed during combustion. If you include a soot formation model in the CFD software, it will calculated based on your local mixture fraction and temperature etc.

September 14, 2020, 06:02	soot mixture fraction	#1
aravind vashista Member ARAVIND SRIDHARA Join Date: Jan 2017 Posts: 32 Rep Power: 10	Hi, I am modeling methane - air non premixed swirl flame. I am using non-premixed flamelet approach along with soot using one step method. I know that fuel mixture fraction at fuel inlet is 1. but what is soot mixture fraction at fuel inlet and air inlet respectively. I hope I will get valuable suggestions in this regard. thank you

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September 20, 2020, 17:59		#2
lei New Member Lei Chen Join Date: Mar 2010 Posts: 21 Rep Power: 17	Hi ARAVIND, you do not need to assign any soot mole fraction in the fuel and air inlet, or just assign 0 because soot is only formed during combustion. If you include a soot formation model in the CFD software, it will calculated based on your local mixture fraction and temperature etc.