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169 | # Applied Python PRISM
# (PRISM) PaRametrIc System Model
#
# Written by Charlie Taylor <cet@appliedpython.com>
# Feb 14, 2006 (Valentines Day)
import sys
from math import *
from prism.MassItem import MassItem
from prism.Summary import Summary
from prism.props import Materials
from prism.props.refprop7.n_dll_fluid import n_fluid
from prism.utils import n_orifice
from prism.fortran import orifice
class Gas_Regulator( MassItem ):
'''
initial outlet properties are in "self.gasObjInit.dup" object
final outlet properties are in "self.gasObjFinal.dup" object
'''
def __init__(self, name="gas regulator", gasSymbol='O2', matlName="Ti",
wdot=0.1, TgasInit=530.0, TgasFinal=400.0,
PgasOutlet=400.0, PgasInit=4000.0, PgasFinal=800.0,
Number=1, CdASF=1.5,
sf=4.0, cxw=1.25, mass_lbm=0.0, ):
MassItem.__init__(self, name, type="inert", mass_lbm=mass_lbm)
if gasSymbol[-3:].lower() == "(g)": gasSymbol=gasSymbol[:-3]
self.gasObjInit = n_fluid(gasSymbol,child=1)
self.gasObjFinal = n_fluid(gasSymbol,child=1)
# calculate density for SCFM
self.gasObjInit.setTP( T=530.0, P=14.7 )
self.Dscf = self.gasObjInit.D
self.Number = Number
self.matlName = matlName
self.rho, self.sy, self.e, self.tming = Materials.getMatlProps(matlName)
self.wdot = wdot
self.PgasInit = PgasInit
self.PgasFinal = PgasFinal
self.PgasOutlet = PgasOutlet
self.TgasInit = TgasInit
self.TgasFinal = TgasFinal
self.sf = sf
self.CdASF = CdASF # multiplier on baseline CdA for margin
self.cxw = cxw
self.reCalc()
def getTPoutletInit(self):
return self.gasObjInit.dup.T,self.gasObjInit.dup.P
def getTPoutletFinal(self):
return self.gasObjFinal.dup.T,self.gasObjFinal.dup.P
def reCalc(self, autoCalc=1):
self.autoCalc = autoCalc
# Size for initial conditions
self.gasObjInit.setTP( T=self.TgasInit, P=self.PgasInit )
self.gasObjInit.dup.setPH( H=self.gasObjInit.H, P=self.PgasOutlet )
self.CdAInit, self.ImSonic = orifice.solveorificecda(self.wdot,self.PgasInit,self.TgasInit,
self.PgasOutlet,self.gasObjInit.gamma(),self.gasObjInit.WtMol)
# Size for final conditions
self.gasObjFinal.setTP( T=self.TgasFinal, P=self.PgasFinal )
self.gasObjFinal.dup.setPH( H=self.gasObjFinal.H, P=self.PgasOutlet )
self.CdAFinal, self.ImSonic = orifice.solveorificecda(self.wdot,self.PgasFinal,self.TgasFinal,
self.PgasOutlet,self.gasObjFinal.gamma(),self.gasObjFinal.WtMol)
self.dpRegulator = self.PgasFinal - self.PgasOutlet
self.dPoverPin = self.dpRegulator/self.PgasFinal
self.CdA = max( self.CdAInit, self.CdAFinal, 1.0E-6) * self.CdASF
self.rinsid = sqrt( self.CdA / pi )
self.dinsid = self.rinsid * 2.0
self.mass_lbm = 15.0 * self.dinsid**3 * (self.rho/0.28) * self.cxw
if self.mass_lbm < 0.1:
self.mass_lbm = 0.1
self.mass_lbm *= self.Number
self.SCFM = self.wdot * 60.0 / self.Dscf # standard cuft per minute
def buildSummary(self):
summ = Summary( summName='Gas Regulator',
componentName=self.name, mass_lbm=self.mass_lbm, type=self.type)
summ.addAssumption( 'Initial:' )
summ.addAssumption( "In: "+self.gasObjInit.getStrTPDphase() )
summ.addAssumption( "Out:"+self.gasObjInit.dup.getStrTPDphase() )
summ.addAssumption( 'Final:' )
summ.addAssumption( "In: "+self.gasObjFinal.getStrTPDphase() )
summ.addAssumption( "Out:"+self.gasObjFinal.dup.getStrTPDphase() )
summ.addAssumption( 'fluid : ' + self.gasObjInit.symbol )
summ.addAssumption( 'Structural Material : ' + self.matlName )
summ.addAssumption( 'Allow Non-Standard wall thickness' )
if self.ImSonic:
summ.addAssumption( 'Final condition is SONIC' )
else:
summ.addAssumption( 'Final condition is SUB-SONIC' )
if self.Number>1:
summ.addAssumption( 'Mass is for %i Regulators total'%self.Number )
# add inputs
summ.addInput('wdot', self.wdot, 'lbm/sec', '%g')
summ.addInput('SCFM', self.SCFM, 'SCFM', '%g')
summ.addInput('TgasInit', self.TgasInit, 'degR', '%.1f')
summ.addInput('PgasInit', self.PgasInit, 'psia', '%.1f')
summ.addInput('TgasFinal', self.TgasFinal, 'degR', '%.1f')
summ.addInput('PgasFinal', self.PgasFinal, 'psia', '%.1f')
summ.addInput('PgasOutlet', self.PgasOutlet, 'psia', '%.1f')
summ.addInput('CdASF', self.CdASF, '', '%g')
summ.addInput('sf', self.sf, '', '%g')
summ.addInput('cxw', self.cxw, '', '%g')
summ.addInput('# Regs', self.Number, '', '%i')
# add outputs
summ.addOutput('CdAInit', self.CdAInit, 'sqin', '%.4f')
summ.addOutput('CdAFinal', self.CdAFinal, 'sqin', '%.4f')
summ.addOutput('CdA', self.CdA, 'sqin', '%.4f')
summ.addOutput( 'dpRegulator', self.dpRegulator, 'psig', '%.2f' )
summ.addOutput( 'dp/Pinlet', self.dPoverPin, '', '%g' )
summ.addOutput( 'rinsid', self.rinsid, 'in', '%.3f' )
summ.addOutput( 'dinsid', self.dinsid, 'in', '%.3f' )
summ.addOutput( 'rho', self.rho, 'lbm/cuin', '%g' )
summ.addOutput( 'sy', self.sy, 'psi', '%g' )
#summ.addOutput( 'e', self.e, 'psi', '%g' )
summ.addOutput( 'tming', self.tming, 'in', '%.3f' )
summ.addOutput( 'fluid dens', self.gasObjInit.D, 'lbm/cuft', '%g' )
summ.addOutput( 'fluid visc', self.gasObjInit.Visc*1.0E-5, 'lb/ft-sec', '%g' )
summ.addOutput( 'fluid sonicV', self.gasObjInit.sonicV, 'ft/sec', '%g' )
if self.Number>1:
summ.addOutput( 'wt/Regulator', self.mass_lbm/self.Number, 'lbm', '%.3f' )
return summ
if __name__ == "__main__": #self test
h = Gas_Regulator(name="Fuel Regulator",wdot=1.0, matlName="Ti",
PgasInit=4000.0, PgasFinal=600.0, PgasOutlet=400.0,
gasSymbol='O2', Number=10)
print h.getMassStr()
print
print h.getSummary()
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