CO and Soot yield

[foster...@gmail.com]

Hello everybody,

I have carried out a simple case of the combustion of polyurethane foam. In the chemical reaction, I have stated that the CO yield is 0,12 and the soot yield is 0,1.

According to the FDS Technical Reference Guide, the CO yield (and so for the soot yield) is defined as follows:

Yco = (mass CO in products) / (mass of Fuel reacted)

Therefore, this means that it is produced 0,12 kg of CO per every kg of fuel reacted.

I have checked the mass.csv file, which shows the quantity of CO and soot produced during the simulation, and the values that I obtain have nothing to do with reality. I am probably not interpreting correctly this file, but I would like to know hoy to understand the results.

I attach you the fds file and the mass.csv file.

Thank you very miuch in advance.

Cheers.

[Randy McDermott]

The first think you need to do is plot the HRR from the _hrr.csv file on top of your specified MLR*HOC.  Do these match?

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[foster...@gmail.com]

Thank you Mr McDermott for your response.

I have checked it out and both curves are the same. In any case, what is written in the mass.csv file is that the mass of CO produced is higher than the mass loss rate of fuel, which is not logical (and so for the soot produced).

I am probably not understanding how the results are presented.

Cheers.

[Randy McDermott]

The mass file shows how much of a given species exists in the domain at a given time, not how much burned.  The FUEL_REAC column is the amount of fuel on the reac line that is present in the domain.  This can theoretically be zero if you burn all the fuel.

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[foster...@gmail.com]

Then, if I want to check the CO and soot yield during the simulation, how would you recommend me to proceed?

I can get the mass loss rate of fuel from the HRR.csv file. However, I would like to know the mass flow of both CO and soot produced during the simulation; according to your response, I can only know the quantity of CO and soot present in the domain, which is not the same as the mass of CO and soot produced.

Thank you for your aid. Cheers.

El miércoles, 18 de octubre de 2017, 11:41:02 (UTC+2), foster...@gmail.com escribió:

[Randy McDermott]

If you are specifying yields, then CO and soot are tied to the mass fraction of PRODUCTS.  Use a SLCF or DEVC for for CO or soot.  If you are trying to do a verification test, then make a closed domain with a premixture of known levels of fuel and air and ensure you get your correct yields.  Similar test are given in the Verification/Species directory.

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