# Burner flame position problem in CFX

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 March 24, 2011, 11:05 Burner flame position problem in CFX #1 Senior Member   Bharath kumar Join Date: Apr 2009 Posts: 157 Rep Power: 8 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 Senior Member   Join Date: Mar 2009 Location: Europe Posts: 168 Rep Power: 8 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 24, 2011, 21:34 #3 Senior Member   Bharath kumar Join Date: Apr 2009 Posts: 157 Rep Power: 8 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.

 March 25, 2011, 15:05 #4 Senior Member   Join Date: Mar 2009 Location: Europe Posts: 168 Rep Power: 8 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 didnīt 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, 09:59 #5 Senior Member   Bharath kumar Join Date: Apr 2009 Posts: 157 Rep Power: 8 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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