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

abnormally high flame temperatures in C2H2/Air com

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

Reply
 
LinkBack Thread Tools Display Modes
Old   May 7, 2007, 13:13
Default abnormally high flame temperatures in C2H2/Air com
  #1
Victor
Guest
 
Posts: n/a
What might be the reason for C2H2/air flame temperature being too high (over 3300 K). I am using 1 global reaction mechanism with eddy-dissip/finite rate model. Adiabatic flame temperature for this mixture should be 1000K lower. Also, CO and H2O do not converge. The geomery and the physics of the problem are very simple.

  Reply With Quote

Old   May 7, 2007, 16:25
Default Re: abnormally high flame temperatures in C2H2/Air
  #2
Allan Walsh
Guest
 
Posts: n/a
Heat capacity of gases not set to be a function of temperature?
  Reply With Quote

Old   May 7, 2007, 16:47
Default Re: abnormally high flame temperatures in C2H2/Air
  #3
Victor
Guest
 
Posts: n/a
Thank you !
  Reply With Quote

Old   May 7, 2007, 18:00
Default Re: abnormally high flame temperatures in C2H2/Air
  #4
Phil
Guest
 
Posts: n/a
These basic models normally over predict the flame temp.

Non-smooth transitions between coarse and dense mesh regions, or highly skewed elements are the usual reasons for poor convergence - OR NON-REALISTIC PHYSICS STRUGGLING TO SATISFY THE FUNDAMENTAL EQUATIONS. This is usually caused by getting the boundary conditions wrong or adding walls you don't notice.
  Reply With Quote

Reply

Thread Tools
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 On
Pingbacks are On
Refbacks are On


Similar Threads
Thread Thread Starter Forum Replies Last Post
Excessively high temperatures brossofor FLUENT 0 June 2, 2010 02:53
High Temperatures during compression John CD-adapco 2 August 29, 2007 03:42
Multicomponent fluid Andrea CFX 2 October 11, 2004 05:12
Temperature is abnormally high! haiong FLUENT 5 August 29, 2004 02:23
Compressible vs. incompressible NS at high Temperatures Jean Lacroix Main CFD Forum 1 December 24, 1999 07:21


All times are GMT -4. The time now is 00:35.