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.
103 lines
2.6 KiB
Python
103 lines
2.6 KiB
Python
"""
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Adiabatic flame temperature and equilibrium composition for a
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fuel/air mixture as a function of equivalence ratio,
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including formation of solid carbon.
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"""
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from Cantera import *
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import sys
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##############################################################
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#
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# Edit these parameters to change the initial temperature, the
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# pressure, and the phases in the mixture
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#
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###############################################################
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temp = 300.0
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pres = 101325.0
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# phases
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gas = importPhase('gri30.cti')
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carbon = importPhase('graphite.cti')
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# the phases that will be included in the calculation, and their
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# initial moles
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mix_phases = [ (gas, 1.0), (carbon, 0.0) ]
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# gaseous fuel species
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fuel_species = 'CH4'
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# air composition
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air_N2_O2_ratio = 3.76
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# equivalence ratio range
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phi_min = 0.3
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phi_max = 3.5
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npoints = 50
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##################################################
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mix = Mixture(mix_phases)
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nsp = mix.nSpecies()
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# create some arrays to hold the data
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phi = zeros(npoints,'d')
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tad = zeros(npoints,'d')
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xeq = zeros([nsp,npoints],'d')
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# find fuel, nitrogen, and oxygen indices
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ifuel, io2, in2 = gas.speciesIndex([fuel_species, 'O2', 'N2'])
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if ifuel < 0:
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raise "fuel species "+fuel_species+" not present!"
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if gas.nAtoms(fuel_species,'O') > 0 or gas.nAtoms(fuel_species,'N') > 0:
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raise "Error: only hydrocarbon fuels are supported."
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stoich_O2 = gas.nAtoms(fuel_species,'C') + 0.25*gas.nAtoms(fuel_species,'H')
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for i in range(npoints):
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phi[i] = phi_min + (phi_max - phi_min)*i/(npoints - 1)
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x = zeros(nsp,'d')
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x[ifuel] = phi[i]
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x[io2] = stoich_O2
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x[in2] = stoich_O2*air_N2_O2_ratio
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# set the gas state
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gas.set(T = temp, P = pres, X = x)
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# create a mixture of 1 mole of gas, and 0 moles of solid carbon.
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mix = Mixture(mix_phases)
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mix.setTemperature(temp)
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mix.setPressure(pres)
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# equilibrate the mixture adiabatically at constant P
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#
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# mix.equilibrate('HP', maxsteps = 1000,
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# err = 1.0e-6, maxiter = 200, loglevel=0)
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mix.vcs_equilibrate('HP', maxsteps = 1000,
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rtol = 1.0e-6, maxiter = 200, loglevel=0)
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tad[i] = mix.temperature();
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print 'At phi = %12.4g, Tad = %12.4g' % (phi[i],tad[i])
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xeq[:,i] = mix.speciesMoles()
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# write output CSV file for importing into Excel
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csvfile = 'adiabatic.csv'
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f = open(csvfile,'w')
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writeCSV(f,['phi','T (K)']+mix.speciesNames())
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for n in range(npoints):
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writeCSV(f,[phi[n], tad[n]]+list(xeq[:,n]))
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f.close()
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print 'output written to '+csvfile
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# make plots
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if '--plot' in sys.argv:
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import plotting
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plotting.plotEquilData(mix, phi, tad, xeq)
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