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161 | # Applied Python PRISM
# (PRISM) PaRametrIc System Model
#
# Written by Charlie Taylor <cet@appliedpython.com>
# Jan 2008
from math import *
import sys
from prism.MassItem import MassItem
from prism.props import Materials
from prism.Summary import Summary
from prism.props import Inc_liquid
from prism.fortran import orifice
class Line_Liq_inpD( MassItem ):
def __str__(self):
return self.name + ' wdot=%g lbm/sec'%self.wdot
def __init__(self, name="liquid line", liqObj=None, matlName="Ti",
wdot=0.1, pLine=400.0, OD=0.5, thkWall=0.045,
len_inches=50.0, Kfactors=2.0, Number=1,
cxw=1.25, roughness=5.0E-6, mass_lbm=0.0 ):
# default roughness (5.0E-6) is for drawn tubing
MassItem.__init__(self, name, type="inert", mass_lbm=mass_lbm)
self.liqObj = liqObj
#if (liqObj is not Inc_liquid.Inc_liquid):
# print "ERROR...",name,"must have Inc_liquid object input for liqObj"
# sys.exit(1)
self.Number = Number
self.matlName = matlName
self.rho, self.sy, self.e, self.tming = Materials.getMatlProps(matlName)
self.OD=OD
self.thkWall=thkWall
self.wdot = wdot
self.Kfactors = Kfactors
self.roughness = roughness
self.pLine = pLine
self.len_inches = len_inches
self.cxw = cxw
self.reCalc()
def reCalc(self, autoCalc=1):
self.autoCalc = autoCalc
self.Q = self.wdot / self.liqObj.rho
self.ID = self.OD - 2.0*self.thkWall
self.Ac = pi * self.ID**2 / 4.0
self.velFPS = self.Q / (self.Ac * 12.0)
self.rinsid = self.ID / 2.0
self.dinsid = self.ID
self.ReNum= self.liqObj.D * self.velFPS * \
(self.dinsid/12.0) / (self.liqObj.Visc/1.0E5) # liq Visc is in [lb/ft-sec * 1.0E5]
self.volLine = pi * self.rinsid**2 * self.len_inches
self.sf = self.thkWall * self.sy * 2.0 / self.pLine / self.dinsid
self.dpLine = orifice.calcturbulenttubedp(self.len_inches ,\
self.Kfactors, self.dinsid, self.wdot, self.liqObj.D, self.roughness,
self.ReNum)
self.deltaP = self.dpLine
self.dPperVelHead = self.wdot**2 / (self.ID**4 * 0.27622 * self.liqObj.D)
self.mass_lbm = pi * ((self.rinsid+self.thkWall)**2 - self.rinsid**2) *\
self.len_inches * self.rho * self.cxw * self.Number
def minGaugeStr(self, t):
if t<= self.tming:
return 'Min Gauge'
else:
return ''
def buildSummary(self):
summ = Summary( summName='Liquid Line',
componentName=self.name, mass_lbm=self.mass_lbm, type=self.type)
summ.addAssumption( 'fluid : ' + self.liqObj.symbol )
summ.addAssumption( 'Structural Material : ' + self.matlName )
if self.Number>1:
summ.addAssumption( 'Mass is for %i lines total'%self.Number )
# add inputs
summ.addInput('wdot', self.wdot, 'lbm/sec', '%g')
summ.addInput( 'OD', self.OD, 'in', '%.3f' )
summ.addInput( 'thkWall', self.thkWall, 'in', '%.3f' )
summ.addInput('len_inches', self.len_inches, 'in', '%g')
summ.addInput('Kfactors', self.Kfactors, 'vel heads', '%g')
summ.addInput('roughness', self.roughness, 'in', '%g')
summ.addInput('pLine', self.pLine, 'psia', '%g')
summ.addInput('cxw', self.cxw, '', '%g')
summ.addInput('# Lines', self.Number, '', '%i')
# add outputs
summ.addOutput( 'dpLine', self.dpLine, 'psid', '%.2f' )
summ.addOutput( 'dPperVelHead', self.dPperVelHead, 'psid', '%.2f' )
summ.addOutput('velFPS', self.velFPS, 'ft/sec', '%g')
summ.addOutput( 'ReNum', self.ReNum, '', '%E' )
summ.addOutput( 'rinsid', self.rinsid, 'in', '%.3f' )
summ.addOutput( 'dinsid', self.dinsid, 'in', '%.3f' )
summ.addOutput( 'volLine', self.volLine, 'cuin', '%g' )
summ.addOutput( 'rho', self.rho, 'lbm/cuin', '%g' )
summ.addOutput( 'sy', self.sy, 'psi', '%g' )
summ.addOutput( '', '', '', '%s' )
summ.addOutput('sf', self.sf, '', '%g')
summ.addOutput( 'tming', self.tming, 'in', '%.3f' )
summ.addOutput( 'fluid rho', self.liqObj.rho, 'lbm/cuin', '%g' )
summ.addOutput( 'fluid visc', self.liqObj.Visc, '1.0E5 * lb/ft-sec', '%g' )
if self.Number>1:
summ.addOutput( 'wt/Line', self.mass_lbm/self.Number, 'lbm', '%.3f' )
return summ
if __name__ == "__main__": #self test
Fl = Inc_liquid.Inc_liquid( symbol="MMH",T=530.0,P=240.0, mass_lbm=10.0)
Ox = Inc_liquid.Inc_liquid( symbol="N2O4",T=530.0,P=240.0, mass_lbm=10.0)
wdotFl = 7.6*.447
h = Line_Liq_inpD(name="Fuel Line",wdot=wdotFl, liqObj=Fl, matlName="Ti",
pLine=400.0, OD=1.5, thkWall=0.03,
len_inches=10.0, Kfactors=2.0, Number=1,
cxw=1.25, roughness=5.0E-6, mass_lbm=0.0)
print h.getMassStr()
print
print h.getSummary()
wdotOx = 14.2*.3655
h = Line_Liq_inpD(name="Oxidizer Line", liqObj=Ox ,wdot=wdotOx, matlName="Ti",
pLine=400.0, OD=1.5, thkWall=0.03,
len_inches=10.0, Kfactors=2.0, Number=1,
cxw=1.25, roughness=5.0E-6, mass_lbm=0.0)
print h.getMassStr()
print
print h.getSummary()
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