Burner flame position problem in CFX

bharath · March 24, 2011, 11:05

Hi to all,
i done a burner simulation in CFX. I used EDM for combustion.But i get the flame far away from near burner zone.i done same problem with Fluent by Mixture Fraction model and got flame at right position(near burner zone).now what i should do in CFX?

joey2007 · March 24, 2011, 14:33

What is mixture fraction model in fluent??????

In CFX:

AS widely known for the EDM (independent of which code) you have to tune the constants.
Alternative: Use the appropriate mixture fraction based model for CFX (flamelet or Zimont/TFC)

bharath · March 24, 2011, 21:34

hi joey,
1.In fluent, am using non premixed combustion model using PDF table.

2.In CFX, which constants i have to tune?

3.From my knowledge, i have to tune reaction parameters (activation temperature,Pre-exponent factor) in De volatilization reaction.Is it right?give me some hints to tune the parameters.

thanks for quick reply.

joey2007 · March 25, 2011, 15:05

volatization? Many people think implicitly of homogenous gas phase combustion when they talk of combustion modelling. You should better describe what you are doing.

Well, why didn´t you look at the burnable volatile mass fractions. If there are not high enough at the right position then you should consider the arrhenius constants.

bharath · March 27, 2011, 10:59

Hi joey,
i don't have arrhenius constants values for my coal.So i have to tune the constants to get the flame at right position.Volatile mass fraction is low(21%) and High Ash coal (42%).i have to do furnace model next from this results.

March 24, 2011, 11:05	Burner flame position problem in CFX	#1
bharath Senior Member Bharath kumar Join Date: Apr 2009 Posts: 169 Rep Power: 17	Hi to all, i done a burner simulation in CFX. I used EDM for combustion.But i get the flame far away from near burner zone.i done same problem with Fluent by Mixture Fraction model and got flame at right position(near burner zone).now what i should do in CFX?

March 24, 2011, 14:33		#2
joey2007 Senior Member Join Date: Mar 2009 Location: Europe Posts: 169 Rep Power: 17	What is mixture fraction model in fluent?????? In CFX: AS widely known for the EDM (independent of which code) you have to tune the constants. Alternative: Use the appropriate mixture fraction based model for CFX (flamelet or Zimont/TFC) __________________ - - - - - ------------------------------------------------------------------------ Please do not forget: I am not paid for answering your questions. Thousands of issues can cause a division by zero. Please do not capture a thread, with the argument: "I have the same issue ...."

March 25, 2011, 15:05		#4
joey2007 Senior Member Join Date: Mar 2009 Location: Europe Posts: 169 Rep Power: 17	volatization? Many people think implicitly of homogenous gas phase combustion when they talk of combustion modelling. You should better describe what you are doing. Well, why didn´t you look at the burnable volatile mass fractions. If there are not high enough at the right position then you should consider the arrhenius constants. __________________ - - - - - ------------------------------------------------------------------------ Please do not forget: I am not paid for answering your questions. Thousands of issues can cause a division by zero. Please do not capture a thread, with the argument: "I have the same issue ...."

March 27, 2011, 10:59		#5
bharath Senior Member Bharath kumar Join Date: Apr 2009 Posts: 169 Rep Power: 17	Hi joey, i don't have arrhenius constants values for my coal.So i have to tune the constants to get the flame at right position.Volatile mass fraction is low(21%) and High Ash coal (42%).i have to do furnace model next from this results. mattedi likes this.

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March 24, 2011, 21:34		#3
bharath Senior Member Bharath kumar Join Date: Apr 2009 Posts: 169 Rep Power: 17	hi joey, 1.In fluent, am using non premixed combustion model using PDF table. 2.In CFX, which constants i have to tune? 3.From my knowledge, i have to tune reaction parameters (activation temperature,Pre-exponent factor) in De volatilization reaction.Is it right?give me some hints to tune the parameters. thanks for quick reply.