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163 | from math import *
from prism import *
from prism.isp import ffc_engine_Dt
etaPulse=1.0
mrBarrier=0.15
FvacGoal = 1250.0
elemDens=None # if None use d/v
MRengine=1.8
etaERE=0.955412 # from MKV-R study
Em=0.85
pc=500.0
oxName= 'N2O4'
fuelName='MMH'
Tox=530.0 # Tox=None if using reference point
Tfuel=530.0 # Tfuel=None if using reference point
props = oxName + '/' + fuelName
# create system object (make sure author is correct... it's used for report)
S = SysModel(name="Chamber Length Optimization", type="liquid",
author="Percy Bell", programName="Generic "+props+' at MR=%g'%MRengine+', Pc=%g'%pc )
# add design variables to the system (these variables may be used to
# optimize the system or to create plots)
# design vars have:
# name, value, minVal, maxVal, step, units, description
S.addDesVars(
['Lprime',1.5,1.,2.,0.1,'in','Chamber Length'],
['pcentBell',70.,70.,90.,2.,'','Percent Bell of Nozzle'],
['LinjToExit',7.0,6.0,9.0,0.5,'in','Lprime + Lnoz'],
['pc',500.,300,500,50,'psia','Chamber Pressure'],
['ko',0.035,0.035,0.05,0.005,'','Entrainment Constant'],
)
Engine = Engine_FFC(name="Est Engine",
oxName=oxName, fuelName=fuelName, etaERE=etaERE,
Pc=pc, Fvac=FvacGoal, eps=25.0, mr=MRengine, CR=2.5, LoverDt=0.01, LchamMin=2.0,
pcentBell=80.)
# now add any Result Variables That might be plotted
# "sysMass" is required
# result variables have:
# name, units, description
S.addResultVars(
['IspDel','sec','Delivered Isp'],
['sysMass','lbm','Total System Mass'],
['eps','','Nozzle Area Ratio'],
['pcentFFC','','Percent Fuel Film Cooling'],
)
# set Feasible Variable
#===== after they have been created, add the Mass Items to the system object ====
S.addMassItem( Engine )
# the following control routine ties together the system components
# with the system design variables
def myControlRoutine(S):
# get current values of design variables
Lprime,pcentBell,LinjToExit,pc,ko = S("Lprime","pcentBell","LinjToExit",'pc','ko')
Engine.mr = MRengine
Engine.pcentBell = pcentBell
Engine.LchamMin = Lprime
Engine.Pc = pc
def newLeng( e ):
Engine.eps = e
Engine.reCalc()
return Engine.Lnoz + Engine.Lcham
G = Goal(goalVal=LinjToExit, minX=2.0, maxX=50.0,
funcOfX=newLeng, tolerance=1.0E-5, maxLoops=40, failValue=None)
eps, ierror = G()
Engine.eps = eps
Engine.reCalc()
S.reCalc()
perfD = ffc_engine_Dt.getFFC_EngPerf(Twall = 3000.0 ,etaPulse=1.0,Lcham=Lprime, Lengine=LinjToExit,
Dthrt = Engine.Dt,elemDens=250.0,MRengine=MRengine,ko=ko, Em=Em,DorfMin=0.006,pc=500.0,
CR=2.0,oxName= 'N2O4',fuelName='MMH',Tox=530.0,Tfuel=530.0,pcentBell=pcentBell,
xlnOverLcham=0.1)
pcentFFC = perfD['pcentFFC']
LP = Lperf( engine = Engine ,Tox=Tox, Tfuel=Tfuel, elemDens=elemDens,
pcentFFC=pcentFFC, mrBarrier=mrBarrier, etaPulse=etaPulse, Em=Em)
IspDel = LP.IspDel
# "sysMass" is required
S["sysMass"] = S.mass_lbm
S["IspDel"] = IspDel
S["eps"] = eps
S["pcentFFC"] = pcentFFC
# need to tell system the name of the control routine
S.setControlRoutine(myControlRoutine)
S.reCalcItems()
make2DParametricPlot(S, sysParam="IspDel", desVar="pc", titleStr=props + ' Lcham Optimization',
paramVar=["pcentBell",60.,70.,80.] ,makeHTML=1, dpi=70, linewidth=2,
ptData=None, ptLegend='', logX=0, logY=0)
make2DParametricPlot(S, sysParam="IspDel", desVar="Lprime", titleStr=props + ' Lcham Optimization',
paramVar=["pcentBell",60.,70.,80.] ,makeHTML=1, dpi=70, linewidth=2,
ptData=None, ptLegend='', logX=0, logY=0)
make2DParametricPlot(S, sysParam="eps", desVar="Lprime", titleStr=props + ' Lcham Optimization',
paramVar=["pcentBell",60.,70.,80.] ,makeHTML=1, dpi=70, linewidth=2,
ptData=None, ptLegend='', logX=0, logY=0)
make2DParametricPlot(S, sysParam="pcentFFC", desVar="Lprime", titleStr=props + ' Lcham Optimization',
paramVar=["pcentBell",60.,70.,80.] ,makeHTML=1, dpi=70, linewidth=2,
ptData=None, ptLegend='', logX=0, logY=0)
make2DParametricPlot(S, sysParam="IspDel", desVar="Lprime", titleStr=props + ' Lcham Optimization',
paramVar=["LinjToExit",6,7,8] ,makeHTML=1, dpi=70, linewidth=2,
ptData=None, ptLegend='', logX=0, logY=0)
make2DParametricPlot(S, sysParam="eps", desVar="Lprime", titleStr=props + ' Lcham Optimization',
paramVar=["LinjToExit",6,7,8] ,makeHTML=1, dpi=70, linewidth=2,
ptData=None, ptLegend='', logX=0, logY=0)
make2DParametricPlot(S, sysParam="pcentFFC", desVar="Lprime", titleStr=props + ' Lcham Optimization',
paramVar=["LinjToExit",6,7,8] ,makeHTML=1, dpi=70, linewidth=2,
ptData=None, ptLegend='', logX=0, logY=0)
make2DParametricPlot(S, sysParam="pcentFFC", desVar="Lprime", titleStr=props + ' Lcham Optimization',
paramVar=["ko",0.035,0.040,0.045,0.05] ,makeHTML=1, dpi=70, linewidth=2,
ptData=None, ptLegend='', logX=0, logY=0)
make2DParametricPlot(S, sysParam="IspDel", desVar="pc", titleStr=props + ' Lcham Optimization',
paramVar=["ko",0.035,0.040,0.045,0.05] ,makeHTML=1, dpi=70, linewidth=2,
ptData=None, ptLegend='', logX=0, logY=0)
# now save summary of system
S.saveFullSummary()
# Be sure to wrap-up any files
S.close()
|