[Leepox]

I am biting more than I can chew as a newbie. Basically I have the case of having a separate air inlet and a separate inlet for coal particles+nitrogen. Sketch is attached.

I have been reading around and I can't find any tutorials at all regarding coal combustion for fluent 13/14. Its a bit frustrating how there are lots of gas combustion cases but not a single one about coal combustion.

Can anybody guide my as to which Species model is best? And if there are any items I have to be extra careful of?

Any help would be greatly appreciated! Cheers!

[byronsmith]

hai,
check out this tutorial. Fluent GUI is almost the same in 6.3 and 12
http://iceberg.shef.ac.uk/docs/fluen...f/tg/tut13.pdf
regards,
Byron Smith

[Leepox]

Thanks a lot for this!

Although I have quickly noticed that it just talks about having a single oxidizer stream (air). I was wondering how this could be done if there was another separate stream of just pure nitrogen.

I've been trying to look at the settings in fluent to no avail.

[byronsmith]

hai
For both the inlets use all the species and for individual inlets give 1 as species mass fraction for O2 and the rest 0. same for the next inlet. hope this helps

[tohfiq]

hey i am facing the same problem on how to define nitrogen inlet.... if you have solved the problem do help .... also what is jet-a<g> boundary species in non premixed combustion model in fluent.

[Leepox]

Originally Posted by tohfiq

hey i am facing the same problem on how to define nitrogen inlet.... if you have solved the problem do help .... also what is jet-a<g> boundary species in non premixed combustion model in fluent.

I have moved off from the non-premixed combustion model to species transport (Eddy-Dissipation) since its a lot more easier to specify gas streams. That and the fact that there are less constraints with what configurations you can only run.

Take note, this model is useful only when you have 10% by volume of solid fuel in the system. (or something like that anyway).

The non-premixed model was used in the early days because it was computationally less intensive, but I'm pretty sure your computer should be able to easily handle species transport.