CFD Online Logo CFD Online URL
Home > Forums > OpenFOAM Running, Solving & CFD

Flame length overpredicted

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

LinkBack Thread Tools Display Modes
Old   October 19, 2010, 05:29
Default Flame length overpredicted
New Member
Join Date: Apr 2010
Posts: 20
Rep Power: 7
mfmohdyasin is on a distinguished road
Dear all,
I try to simulate methanol spray combustion in a swirl-stabilized burner using dieselFoam.
I used cylindricalInletVelocity BC for inlet gas flow, and unitInjector for methanol spray. I got very long flame--could not see the flame tip even after increasing the combustor length by factor of 5. All the boundary conditions are based on a benchmark experiment. I've tried to increase reaction rate in chem.inp file by 10 order of magnitude but no difference seen in term of flame length.

Has anyone encounter this problem before? Any 'guess' is welcomed.

mfmohdyasin is offline   Reply With Quote

Old   October 21, 2010, 06:43
Franco Marra
Join Date: Mar 2009
Location: Napoli - Italy
Posts: 52
Rep Power: 8
francescomarra is on a distinguished road
Dear Fairus,

it is very difficult to suggest something meaningful with so few information about your simulation. I can just try to guess some possibilities in the spirit that I will certainly miss the right answer but I could promote your thoughts about the different issues involved.

Firstly it is important to check the geometry: just missing the right units (m instead of mm f.i.) could give you completely different conditions.

To have a so long flame means that you are putting much more fuel than air: how do you check your stoichiometry ? I would suggest to test the simulation by reducing the the mass flow rate of fuel.

My best regards,

francescomarra is offline   Reply With Quote


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
Turbulence length scale and integral length scale rizhang CFX 1 September 10, 2009 06:38
Enquiry about the flame simulation in rotary kiln hassanelattar FLUENT 0 March 25, 2009 08:41
Length Scales in Flame leaf Main CFD Forum 1 September 1, 2008 04:20
About the laminar jet diffusion flame length Sheng Chen Main CFD Forum 1 July 10, 2004 01:07

All times are GMT -4. The time now is 03:05.