6cb4bd93ce
4 spaces per indentation level, no tabs, no trailing whitespace, and a single newline at end of each file.
84 lines
2.6 KiB
Python
84 lines
2.6 KiB
Python
#
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# ADIABATIC_FLAME - A freely-propagating, premixed methane/air flat
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# flame with multicomponent transport properties
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#
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from Cantera import *
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from Cantera.OneD import *
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from Cantera.OneD.FreeFlame import FreeFlame
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################################################################
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#
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# parameter values
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#
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p = OneAtm # pressure
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tin = 300.0 # unburned gas temperature
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mdot = 0.04 # kg/m^2/s
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comp = 'CH4:0.45, O2:1, N2:3.76' # premixed gas composition
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initial_grid = [0.0, 0.001, 0.01, 0.02, 0.029, 0.03] # m
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tol_ss = [1.0e-5, 1.0e-9] # [rtol atol] for steady-state
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# problem
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tol_ts = [1.0e-5, 1.0e-9] # [rtol atol] for time stepping
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loglevel = 1 # amount of diagnostic output (0
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# to 5)
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refine_grid = 1 # 1 to enable refinement, 0 to
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# disable
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gas = GRI30('Mix')
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gas.addTransportModel('Multi')
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# set its state to that of the unburned gas
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gas.setState_TPX(tin, p, comp)
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f = FreeFlame(gas = gas, grid = initial_grid, tfix = 600.0)
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# set the upstream properties
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f.inlet.set(mole_fractions = comp, temperature = tin)
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f.set(tol = tol_ss, tol_time = tol_ts)
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f.showSolution()
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f.set(energy = 'off')
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f.setRefineCriteria(ratio = 10.0, slope = 1, curve = 1)
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f.setMaxJacAge(50, 50)
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f.setTimeStep(1.0e-5, [2, 5, 10, 20, 50])
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f.solve(loglevel, refine_grid)
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f.save('ch4_adiabatic.xml','no_energy',
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'solution with the energy equation disabled')
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f.set(energy = 'on')
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f.setRefineCriteria(ratio = 3.0, slope = 0.1, curve = 0.2)
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f.solve(loglevel, refine_grid)
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f.save('ch4_adiabatic.xml','energy',
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'solution with the energy equation enabled')
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print 'mixture-averaged flamespeed = ',f.u()[0]
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gas.switchTransportModel('Multi')
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f.flame.setTransportModel(gas)
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f.solve(loglevel, refine_grid)
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f.save('ch4_adiabatic.xml','energy_multi',
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'solution with the energy equation enabled and multicomponent transport')
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# write the velocity, temperature, density, and mole fractions to a CSV file
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z = f.flame.grid()
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T = f.T()
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u = f.u()
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V = f.V()
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fcsv = open('adiabatic_flame.csv','w')
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writeCSV(fcsv, ['z (m)', 'u (m/s)', 'V (1/s)', 'T (K)', 'rho (kg/m3)']
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+ list(gas.speciesNames()))
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for n in range(f.flame.nPoints()):
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f.setGasState(n)
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writeCSV(fcsv, [z[n], u[n], V[n], T[n], gas.density()]
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+list(gas.moleFractions()))
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fcsv.close()
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print 'solution saved to adiabatic_flame.csv'
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print 'multicomponent flamespeed = ',u[0]
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f.showStats()
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