46 lines
1.4 KiB
Python
Executable file
46 lines
1.4 KiB
Python
Executable file
from Cantera import exceptions
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from Cantera.num import array
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from Cantera.elements import elementMoles
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def det3(A):
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"""Determinant of a 3x3 matrix."""
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return (A[0,0]*(A[1,1]*A[2,2] - A[1,2]*A[2,1])
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- A[0,1]*(A[1,0]*A[2,2] - A[1,2]*A[2,0])
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+ A[0,2]*(A[1,0]*A[2,1] - A[2,0]*A[1,1]))
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def stoich_fuel_to_oxidizer(mix, fuel, oxidizer):
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"""Fuel to oxidizer ratio for stoichiometric combustion.
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This function only works for fuels composed of carbon, hydrogen,
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and/or oxygen. The fuel to oxidizer ratio is returned that results in
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"""
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# fuel
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mix.setMoleFractions(fuel)
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f_carbon = elementMoles(mix, 'C')
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f_oxygen = elementMoles(mix, 'O')
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f_hydrogen = elementMoles(mix, 'H')
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#oxidizer
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mix.setMoleFractions(oxidizer)
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o_carbon = elementMoles(mix, 'C')
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o_oxygen = elementMoles(mix, 'O')
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o_hydrogen = elementMoles(mix, 'H')
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B = array([f_carbon, f_hydrogen, f_oxygen],'d')
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A = array([[1.0, 0.0, -o_carbon],
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[0.0, 2.0, -o_hydrogen],
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[2.0, 1.0, -o_oxygen]], 'd')
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num = array(A,'d')
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num[:,2] = B
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r = det3(num)/det3(A)
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if r <= 0.0:
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raise CanteraError('negative or zero computed stoichiometric fuel/oxidizer ratio!')
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return 1.0/r
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if __name__ == "__main__":
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g = GRI30()
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print stoich_fuel_to_oxidizer(g, 'CH4:1', 'O2:1')
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