How to make a fuel blend to calculate the adiabatic flame temperature

Filipe Paula

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Dec 21, 2015, 9:14:38 PM12/21/15

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Hi guys,

Sorry if the question doesn't make sense, but I am new at Cantera.

In my senior design I am dealing with combustor chamber design. To design the combustor I need the adiabatic flame temperature curve of the fuels I am working with and I am using Cantera to generate those curves.

However I'm having difficult to deal with biodiesel surrogate reaction mechanism. The biodiesel surrogate I am trying do use is a blend of Methyl Decanoate (md), Methyl-9-decenoate (md9d) and n-Heptane (nc7h16). The problem is that I need to make a blend with 50% of nc7h16, 25% of md and 25% of md9d and I haven't been able to do this.

I am sending attached the mechanism I'm using and a matlab script of my code so far. Can you guys help me to solve this problem?

Thank you very much.

ad.m

biodiesel_ERC.cti

Rodolfo Rodrigues

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Dec 22, 2015, 10:30:36 AM12/22/15

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Hi Filipe,

I recommend you to take a look at Cantera tutorial:
http://www.cantera.org/docs/sphinx/html/cython/tutorial.html

It uses Python but it's very similar to MATLAB.

The interesting issue for your problem is the mole fractions setting of the mixture of surrogate species (see "Setting the State" section). You shouldn't also miss to set the enthalpy of mixture properly. Your blend must have the same enthalpy of the original fuel.

Regards,

Rodolfo

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Rodolfo Rodrigues, MSc Eng

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Filipe Paula

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Dec 23, 2015, 9:00:42 AM12/23/15

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Thank you for your reply. I was able to make a blend of the fuel. Attached is the file with my solution.

About setting the enthalpy of the blend, that must be done at some specific reference temperature?

Thank you.

ad.m

Rodolfo Rodrigues

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Dec 29, 2015, 6:00:47 AM12/29/15

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Filipe,

Generally you can assume the feed (fuel + air) is at 298.15 K (reference temperature) so its enthalpy is equal to sum of enthalpy of formation of each species. You only need to figure out the value of enthalpy of formation of biodiesel.