What is model of burner stabilized flame stand for, don't understand the parameter tburber

[Howard Shaw]

Hello guys. As show in the attachment, I don't understand what's the tburner mean. Could someone explain it? What's more, what's this model stand for? Could someone provide some information about it. Thank you !

[Bryan W. Weber]

Dear Howard,

Burner-stabilized flames are a relatively simple experiment to run in the lab, so they are used for a lot of combustion research. You should search the literature for more information about their utility. Here is one article to get you started: http://onlinelibrary.wiley.com/doi/10.1002/bbpc.19790830915/abstract

tburner is the temperature of the gas at the inlet to the burner. You can tell this by 1) The number is 373, which is equal to 100C in Kelvin 2) A few lines down, it is used to set the temperature gas.TPX = tburner, p, reactants

Best,

Bryan

[Howard Shaw]

Thanks a lot!

[Howard Shaw]

Dear Weber,

   The article you added a link seems not English journal. Could you give me another link for understanding the burner experiment? e.g. is it the same as in the attachment?  Still I have a question that this simulation generates the velocity in different distance, is that possible to get a laminar flame speed from these data? Since CHEMKIN has the same model which can get flame speed data.

    Thank you!

On Sunday, December 20, 2015 at 1:49:28 AM UTC, Bryan W. Weber wrote:

[Bryan W. Weber]

Dear Howard,

Although the journal title is not in English, the paper is written in English. It might be similar to the paper you posted, I'm not sure, I'm not too familiar with the flames area. Please don't post full papers on the board here, they are typically under copyright from the journal.

For your other question, as best I can tell, CHEMKIN cannot give you flame speeds from a burner-stabilized configuration. They do have a module to calculate flame speeds, but I don't think it models a burner-stabilized flame.

Regards,
Bryan

[Rodolfo Rocha]

Dear Byan,

In both burner_flame.py and flame_fixed_T.py what does mdot measures? Mass flow of both reactants or only fuel? Something like (dm/dt)/A (A for burner area)?

I have a flat flame burner with a diameter of around 3 cm, operating at 300 W (thermal input) burning methane (very low), and the values I get for mdot are 3 times the ones from the example, when I use the sum of the reactants flow. My code (flame_fixed_T) does not converge, even using GRI 3.0.

Would you mind to take a look at my code? I send you attached.

Best regards,

[Steven DeCaluwe]

Hi Rodolfo,

It looks like mdot is mass flow per unit area.  This is from line 710 of `onedim.py`:

    u0 = self.burner.mdot/self.gas.density

So to get a velocity, the units of mdot must to be kg/m2/s.  I wouldn’t necessarily call it (dm/dt)/A, since (dm/dt) typically refers to the change evolution of the mass in your control volume.  I might call it something like J/A, where J is a mass flux.  But that’s mainly just semantics.

From my understanding, the burner-stabilized flame has a pre-mixed inlet (fuel + oxidizer enter as a single flow), so the mdot would correspond to the total flow.  

Best,

Steven

——————————————————————————————————

Steven DeCaluwe, PhD

Assistant Professor of Mechanical Engineering

Colorado School of Mines

Brown Building W410B

Golden, CO 80401

email: deca...@mines.edu

phone: (303) 273-3666

Twitter: @DeCaluweGroup

--
You received this message because you are subscribed to the Google Groups "Cantera Users' Group" group.
To unsubscribe from this group and stop receiving emails from it, send an email to cantera-user...@googlegroups.com.
To post to this group, send email to canter...@googlegroups.com.
Visit this group at https://groups.google.com/group/cantera-users.
For more options, visit https://groups.google.com/d/optout.
<flame_fixed_T1.py><tdata.dat>

[Rodolfo Rocha]

Hi Steven,

Thank you for your answer. My problems seem to be related to the temperature profile, since it looks like I have to use the flame zone as input too. Maybe I have to estimate the temperatures at the flame, since I cannot take good measurements too close.

Best regards,

Em terça-feira, 3 de abril de 2018 16:46:24 UTC+1, S. DeCaluwe escreveu:

Hi Rodolfo,

It looks like mdot is mass flow per unit area.  This is from line 710 of `onedim.py`:

    u0 = self.burner.mdot/self.gas.density

So to get a velocity, the units of mdot must to be kg/m2/s.  I wouldn’t necessarily call it (dm/dt)/A, since (dm/dt) typically refers to the change evolution of the mass in your control volume.  I might call it something like J/A, where J is a mass flux.  But that’s mainly just semantics.

From my understanding, the burner-stabilized flame has a pre-mixed inlet (fuel + oxidizer enter as a single flow), so the mdot would correspond to the total flow.  

Best,

Steven

——————————————————————————————————

Steven DeCaluwe, PhD

Assistant Professor of Mechanical Engineering

Colorado School of Mines

Brown Building W410B

Golden, CO 80401

email: ...@mines.edu