# combustion

 Register Blogs Members List Search Today's Posts Mark Forums Read

 March 18, 2007, 11:08 combustion #1 selva Guest   Posts: n/a can anyone tell me how to give equivalence ratio value in fluent. thanks in advance

 March 21, 2007, 05:17 Re: combustion #2 Zenith Guest   Posts: n/a HI Equivalence ratio value input depends on the type of combustion, one is trying to model. It offers following types of combustion models Premixed combustion Non premixed Partially premixed What type of model You are using. zenith mark Benaissa Sabrina likes this.

 March 21, 2007, 11:14 Re: combustion #3 selva Guest   Posts: n/a hi, i am modeling premixed combustion with an equivalence ratio of 4.4. i know the air and fuel velocity and i have given the value at the boundary condition along with the species mass fraction. then where we have to specify the equivalence value? or equivalence ratio is used to find air and fuel velocity? plz reply thanks

 March 22, 2007, 03:41 Re: combustion #4 zenith Guest   Posts: n/a HI For premixed combustion, species transport equations are not solved. Fluent solves the equation for mean progress variable'c'. Hence species in there elemental compostion remain conserved for premixed combustion. So we are left with the conservation of energy, how Fluent does it. Dear if you are using premixed combustion model then there are two possiblities 1) adiabetic In adiabetic premixed combustion, energy equation is not solved. Temperature of mixture is calculated from the temperature of inlet mixture and adiabetic flame temperature. Fluent assumes or fits a linear approximation bewteen these two temperature limits. 2) nonadiabetic in non adiabetic premixed combustion, energy equation is solved, so two informations are needed, first heat of combustion and the other is mass fraction of unburnt fuel It is the second parameter " mass fraction of unburnt fuel" in inlet stream which is calculated from equivalence ratio. Mass fraction apperas in the material properties of mixture. Defining this parameter means that you are defining the equivalence ratio. You will not see this parameter it modeling adiabetic system Hope this answers your question Zenith mark

 March 23, 2007, 00:00 Re: combustion #5 selva Guest   Posts: n/a thanks ya, i am using adiabatic condition. from ur answer i feel that i am in correct path. thanks a lot

 June 12, 2017, 08:08 help #6 New Member   Manina Sabi Join Date: Mar 2017 Posts: 3 Rep Power: 2 could you tell me please how to give equivalence ratio value in fluent and my type is non-premixed. thanks in advance

 Thread Tools Display Modes Linear Mode

 Posting Rules You may not post new threads You may not post replies You may not post attachments You may not edit your posts BB code is On Smilies are On [IMG] code is On HTML code is OffTrackbacks are On Pingbacks are On Refbacks are On Forum Rules

 Similar Threads Thread Thread Starter Forum Replies Last Post tanjinjack FLUENT 2 September 26, 2016 04:10 nileshjrane OpenFOAM 1 December 13, 2010 07:20 popi CFX 7 July 11, 2007 18:40 Arnab CD-adapco 0 May 24, 2005 18:23 Raul Main CFD Forum 0 March 18, 2005 08:53

All times are GMT -4. The time now is 01:56.