CFD Online Logo CFD Online URL
www.cfd-online.com
[Sponsors]
Home > Forums > Software User Forums > ANSYS > FLUENT

gas turbine combustor model - HELP!

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

Like Tree1Likes
  • 1 Post By Phil

Reply
 
LinkBack Thread Tools Search this Thread Display Modes
Old   April 8, 2007, 12:03
Default gas turbine combustor model - HELP!
  #1
Phil
Guest
 
Posts: n/a
I'm modeling a tubular combustor with swirler& vane passage fuel injection as part of my PhD and I'm having big problems with the combustion model.

For these swirling combustion flows the finite rate/eddy dissipation model is essential but when I use it the flame goes out eventually after around 25 iterations even when having the outer wall at 1500K and patching in the temp of 1300K.

The boundary conditions were worked out by my supervisor and previous theses confirm them. The aerodynamics are spot on but when adding combustion (methane) the flame keeps going out for this model. The eddy dissipation model can be used but combustion occurs where the flow velocity is very high so flame should be quenched. I wrote a UDF to halt reactions > 80,100,120m/s but results are still not great but more sensible.
Emeka likes this.
  Reply With Quote

Old   April 8, 2007, 13:20
Default Re: gas turbine combustor model - HELP!
  #2
Gopinath s
Guest
 
Posts: n/a
Sir

I am doing the same project an aero engine ,now i am on the initial stage ie flow simulation , can u help me to get the profile of the combustion area /plot the contour of the same, which book i have to refer, can u send me some journals reg this . it could be greatful to me.
  Reply With Quote

Old   April 9, 2007, 06:05
Default Re: gas turbine combustor model - HELP!
  #3
Phil
Guest
 
Posts: n/a
what do you mean?

you need to create the geometry similar to CAD, then create a mesh. You should do both the Fluent and Gambit tutorials.

Start off just on the k-epsilon turbulence model until much later when the model is working properly then use RSM.

Not sure which journals to suggest but go to any University library or search online and you should find what you are looking for. If you are just making the cold flow sim just now you should just make sure you have ALL correct dimensions then make the geometry like you would in CAD. Keep on plugging away at it and refer to the documentation/tutorials when you get stuck.

The tutorials and documentation really are better than books for learning to use CFD software but any of the general books on this site are good. Ive read Computational methods for fluid dynamics and theoretical and numerical combustion.

What type of combustor is it? tubular, annular, etc.???????
  Reply With Quote

Reply

Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

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 Off
Trackbacks are Off
Pingbacks are On
Refbacks are On


Similar Threads
Thread Thread Starter Forum Replies Last Post
mass flow in is not equal to mass flow out saii CFX 12 March 19, 2018 06:21
Gas turbine load problem hashimbukhari Main CFD Forum 2 July 24, 2010 04:48
Constant velocity of the material Sas CFX 15 July 13, 2010 09:56
Setting up gas turbine blade geometry for meshing sherifkadry Main CFD Forum 0 June 1, 2009 17:28
Gas pressure question Dan Moskal Main CFD Forum 0 October 24, 2002 23:02


All times are GMT -4. The time now is 18:34.