84 lines
2.6 KiB
Python
84 lines
2.6 KiB
Python
#
|
|
# ADIABATIC_FLAME - A freely-propagating, premixed methane/air flat
|
|
# flame with multicomponent transport properties
|
|
#
|
|
from Cantera import *
|
|
from Cantera.OneD import *
|
|
from Cantera.OneD.FreeFlame import FreeFlame
|
|
|
|
################################################################
|
|
#
|
|
# parameter values
|
|
#
|
|
p = OneAtm # pressure
|
|
tin = 300.0 # unburned gas temperature
|
|
mdot = 0.04 # kg/m^2/s
|
|
|
|
comp = 'CH4:0.45, O2:1, N2:3.76' # premixed gas composition
|
|
|
|
initial_grid = [0.0, 0.001, 0.01, 0.02, 0.029, 0.03] # m
|
|
|
|
tol_ss = [1.0e-5, 1.0e-9] # [rtol atol] for steady-state
|
|
# problem
|
|
tol_ts = [1.0e-5, 1.0e-4] # [rtol atol] for time stepping
|
|
|
|
loglevel = 1 # amount of diagnostic output (0
|
|
# to 5)
|
|
|
|
refine_grid = 1 # 1 to enable refinement, 0 to
|
|
# disable
|
|
|
|
|
|
gas = GRI30('Mix')
|
|
gas.addTransportModel('Multi')
|
|
|
|
# set its state to that of the unburned gas
|
|
gas.setState_TPX(tin, p, comp)
|
|
|
|
f = FreeFlame(gas = gas, grid = initial_grid, tfix = 600.0)
|
|
|
|
# set the upstream properties
|
|
f.inlet.set(mole_fractions = comp, temperature = tin)
|
|
|
|
f.set(tol = tol_ss, tol_time = tol_ts)
|
|
f.showSolution()
|
|
|
|
f.set(energy = 'off')
|
|
f.setRefineCriteria(ratio = 10.0, slope = 1, curve = 1)
|
|
f.setMaxJacAge(50, 50)
|
|
f.setTimeStep(1.0e-5, [1, 2, 5, 10, 20])
|
|
|
|
f.solve(loglevel, refine_grid)
|
|
f.save('ch4_adiabatic.xml','no_energy',
|
|
'solution with the energy equation disabled')
|
|
|
|
f.set(energy = 'on')
|
|
f.setRefineCriteria(ratio = 3.0, slope = 0.1, curve = 0.2)
|
|
f.solve(loglevel, refine_grid)
|
|
f.save('ch4_adiabatic.xml','energy',
|
|
'solution with the energy equation enabled')
|
|
print 'mixture-averaged flamespeed = ',f.u()[0]
|
|
|
|
gas.switchTransportModel('Multi')
|
|
f.flame.setTransportModel(gas)
|
|
f.solve(loglevel, refine_grid)
|
|
f.save('ch4_adiabatic.xml','energy_multi',
|
|
'solution with the energy equation enabled and multicomponent transport')
|
|
|
|
# write the velocity, temperature, density, and mole fractions to a CSV file
|
|
z = f.flame.grid()
|
|
T = f.T()
|
|
u = f.u()
|
|
V = f.V()
|
|
fcsv = open('adiabatic_flame.csv','w')
|
|
writeCSV(fcsv, ['z (m)', 'u (m/s)', 'V (1/s)', 'T (K)', 'rho (kg/m3)']
|
|
+ list(gas.speciesNames()))
|
|
for n in range(f.flame.nPoints()):
|
|
f.setGasState(n)
|
|
writeCSV(fcsv, [z[n], u[n], V[n], T[n], gas.density()]
|
|
+list(gas.moleFractions()))
|
|
fcsv.close()
|
|
|
|
print 'solution saved to adiabatic_flame.csv'
|
|
print 'multicomponent flamespeed = ',u[0]
|
|
f.showStats()
|