2528df0f75
These changes make it unnecessary to copy header files around during the build process, which tends to confuse IDEs and debuggers. The headers which comprise Cantera's external C++ interface are now in the 'include' directory. All of the samples and demos are now in the 'samples' subdirectory.
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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