diesel spray and combustion with EGR

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

 May 15, 2007, 21:42 diesel spray and combustion with EGR #1 usker Guest   Posts: n/a Sponsored Links Hello everybody, I want to calculate diesel spray and combustion problem with various EGR conditions: 1. I set Unpremixed/Diffusion EBU LATCT 2. I write the reaction C12H26 + 18.5O2 -> 12CO2 + 13H2O. 3. For O2 Fixed-Fraction I specify the value depending on my EGR condition. (for example, without EGR-0.233) 4. In molecular properties for scalars I add CO2(r)and H2O(r) as active scalars. 5. In Additional scalars->Initialization, I specify Initial Mass Fractions for O2, N2, CO2(r) and H2O(r) depending on my EGR conditions. N2 always will be 0.767 right? Because if I write the reaction like C12H26+18.5(O2+3.76N2)->12CO2+13H2O+69.56N2 the N2 content is equal on the left hand side and the right hand side. But when we initialize Air for additional scalars we have to specify N2 mass fraction as 0.767, is it right? Is this procedure correct? Please share your knowledge Appreciate it

 May 16, 2007, 04:34 Re: diesel spray and combustion with EGR #2 Klaas Klever Guest   Posts: n/a 1- 4 sounds reasonable (don't forget to define a scalar for C12H26). Although the overall mass flow of N2 won't change (if we neglect NOx formation), the mass fraction at the inlet and the outlet will differ as you add mass with your fuel. However, your initial conditions are only the starting point for the iterations (I assume you are running steady-state). They should not affect the solution, only the time it takes to reach that solution. The more important setting for the result is the scalar mass fractions in the boundary conditions. hope that helps.

 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 Benzamia FLUENT 8 January 22, 2012 01:33 usker Siemens 12 March 1, 2008 07:09 usker Siemens 12 December 1, 2007 20:08 usker Siemens 6 April 24, 2006 22:36 Marco FLUENT 0 September 14, 2005 08:27