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239 | # Applied Python PRISM
# (PRISM) PaRametrIc System Model
#
# Written by Charlie Taylor <cet@appliedpython.com>
# Oct,21 2005
from math import *
from prism.MassItem import MassItem
from prism.fortran import tank_eles
from prism.props import Materials
from prism.Summary import Summary
from prism.pov import POV_Items, POV_Basics
from prism.utils.Goal import Goal
exp_dict = {0:'calculate expulsion eff',1:'input expulsion eff'}
class Tank_PVOW( MassItem ):
def __init__(self, name="tank", mass_lbm=0.0,
PVOW_inp = 0.5E6, MEOP_based=1,
vfree=1000.0,ell=1.414,rcyltd=2.0,ptank=350.0,
sf=1.5,cxw=1.0, matlName="Ti",
inpex=0,expefi=0.99, Number=1,
tliner=0.0,rholiner=0.1):
self.PVOW_inp = PVOW_inp
self.MEOP_based = MEOP_based # if NOT based on MEOP, then use burst
MassItem.__init__(self, name, type="inert", mass_lbm=mass_lbm)
self.makeCompositeTank = 0
self.kalmod = 0
self.matlName = matlName
self.rho, self.sy, self.e, self.tming = Materials.getMatlProps(self.matlName)
self.Cp_eff = 0.15 # effective Cp of all tank materials combined
self.Number = Number # each tank has vfree
self.vfree = vfree
self.ell = ell
self.rcyltd = rcyltd
self.ptank = ptank
self.sf = sf
self.cxw = cxw
self.ithcyl = 1
self.kacqui = 0
self.inpex = inpex
self.expefi = expefi
self.inpTblad = 1
self.tblad = 0.0
self.tbond = 0.0
self.ttrspc = 0.0
self.rhobnd = 0.04
self.rhoacq = 0.1
self.tliner = tliner
self.rholiner = rholiner
self.reCalc()
def getPOV_Item(self):
if hasattr( self, 'texture'):
texture = self.texture
else:
from POV import POV_Basics
texture = POV_Basics.Texture( colorName="Gray50" )
s = POV_Items.CSE_Tank( radius=self.OR, ellRatio=self.ell, cylLen=self.cyl, texture=texture)
return s
def setToMaxID(self, IDmax=100.0):
self.rcyltd = 0.0
self.reCalc()
Rmax = IDmax / 2.0
if self.rinsid > Rmax:
Vd = 4.*pi*Rmax**3/3./self.ell
L = (self.vtank-Vd)/pi/Rmax**2
self.rcyltd = max(0.0,L/Rmax/2.0)
self.reCalc()
def setToLength(self, L=100.0):
self.rcyltd = 0.0
self.reCalc()
# only try to make it L long by adding cylinder length
if self.hinsid < L:
V = self.vtank
e = self.ell
rmax = (V*e*3./4./pi)**(1./3.)
rmin = sqrt( V/pi/L )
for i in range(40):
r = (rmin+rmax)/2.0
Lcyl = L - 2.0*r/e
Vtest = 4.*pi*r**3/3./e + pi*r**2*Lcyl
if Vtest>V:
rmax = r
else:
rmin = r
self.rcyltd = max(0.0,Lcyl/r/2.0)
self.reCalc()
def reCalc(self):
default_cxw = 1.0
self.rinsid,self.hinsid,self.cyl,self.wacqui,\
self.vacqui,self.dpacq,self.pullag,self.vresid,\
self.vtank,self.thkcyl,self.thkend,self.thkBladOut,self.wliner,self.wtank= \
tank_eles.csetnk(self.makeCompositeTank,self.kalmod,
self.sy,self.e,self.rho,self.tming,self.vfree,
self.ell,self.rcyltd,self.ptank,self.sf,default_cxw,
self.ithcyl,self.kacqui,self.inpex,self.expefi,
self.inpTblad,self.tblad,self.tbond,self.ttrspc,
self.rhobnd,self.rhoacq,self.tliner,self.rholiner)
self.dinsid = 2.0*self.rinsid
self.pov_h = self.cyl + self.dinsid/self.ell
self.pov_w = self.dinsid
self.pov_d = self.dinsid
self.Across = pi * self.rinsid**2
ECC=sqrt(1.-(1./self.ell)**2)
HEADCO=pi/2.
if self.ell>1.0:
HEADCO=(pi/4.)*(1.+log((1.+ECC)/(1.-ECC))/(2.*ECC*self.ell**2))
HSA = HEADCO*self.dinsid**2
self.SAinsid = pi*self.dinsid*self.cyl + 2.*HSA
if self.thkcyl <= self.tming:
self.Pburst = self.tming * self.sy / self.rinsid
else:
self.Pburst = self.sf * self.ptank
self.OD = 2.0* (self.rinsid + self.thkcyl + self.thkBladOut + self.tliner)
self.OR = self.OD / 2.0
self.OH = self.hinsid + 2.0* ( self.thkend + self.thkBladOut + self.tliner)
if self.MEOP_based:
self.wtank = self.cxw * self.ptank * self.vtank / self.PVOW_inp
else:
self.wtank = self.cxw * self.Pburst * self.vtank / self.PVOW_inp
# if more than one tank, increase mass to reflect that
self.mass_lbm = self.wtank * self.Number
try:
self.PVoverW = self.ptank*self.vtank*self.Number/self.mass_lbm
self.PburstVoverW = self.Pburst*self.vtank*self.Number/self.mass_lbm
except:
self.PVoverW = 0.0
self.PburstVoverW = 0.0
def minGaugeStr(self, t):
if t<= self.tming:
return 'Min Gauge'
else:
return ''
def buildSummary(self):
summ = Summary( summName='Cylindrical/Spherical/Elliptical Tank',
componentName=self.name, mass_lbm=self.mass_lbm, type=self.type)
if self.MEOP_based:
summ.addAssumption( 'PV/W is based on MEOP' )
else:
summ.addAssumption( 'PV/W is based on Burst Pressure' )
if self.Number>1:
summ.addAssumption( 'Mass is for %i Tanks total'%self.Number )
# add inputs
summ.addInput('PV/W input', self.PVOW_inp, 'lbf-in/lbm', '%g')
summ.addInput('vfree', self.vfree, 'cuin', '%g')
summ.addInput('vfreeTotal', self.vfree*self.Number, 'cuin', '%g')
summ.addInput('ell', self.ell, '', '%g')
summ.addInput('rcyltd', self.rcyltd, '', '%g')
summ.addInput('ptank', self.ptank, 'psia', '%g')
summ.addInput('sf', self.sf, '', '%g')
summ.addInput('cxw', self.cxw, '', '%g')
summ.addInput('inpex', self.inpex, '', '%g')
summ.addInput('expefi', self.expefi, '', '%g')
summ.addInput('tliner', self.tliner, 'in', '%.3f')
summ.addInput('rholiner', self.rholiner, 'lbm/cuin', '%g')
# add outputs
summ.addOutput( 'rinsid', self.rinsid, 'in', '%.3f' )
summ.addOutput( 'dinsid', self.dinsid, 'in', '%.3f' )
summ.addOutput( 'hinsid', self.hinsid, 'in', '%.3f' )
summ.addOutput( 'SAinsid', self.SAinsid, 'sqin', '%.3f' )
summ.addOutput( 'cyl', self.cyl, 'in', '%.3f' )
summ.addOutput( 'pullag', self.pullag, 'psia', '%g' )
summ.addOutput( 'vresid', self.vresid, 'cuin', '%g' )
summ.addOutput( 'vtank', self.vtank, 'cuin', '%g' )
if self.wliner > 0.0:
summ.addOutput( 'wliner', self.wliner, 'lbm', '%.3f' )
summ.addOutput( 'wtank(+liner)', self.wtank, 'lbm', '%.3f' )
else:
summ.addOutput( 'wtank', self.wtank, 'lbm', '%.3f' )
#summ.addOutput( 'rho', self.rho, 'lbm/cuin', '%g' )
#if not self.makeCompositeTank:
# summ.addOutput( 'sy', self.sy, 'psi', '%g' )
# summ.addOutput( 'e', self.e, 'psi', '%g' )
# summ.addOutput( 'tming', self.tming, 'in', '%.3f' )
summ.addOutput( 'PmeopVoverW', self.PVoverW, 'lbf-in/lbm', '%g' )
summ.addOutput( 'Pburst(est.)', self.Pburst, 'psia', '%.1f' )
summ.addOutput( 'PburstVoverW', self.PburstVoverW, 'lbf-in/lbm', '%g' )
return summ
if __name__ == "__main__": #self test
print "X33 GOX Tank =", 3.703,"lbm"
print "Calculated = ",
oxekv = Tank_PVOW(name="X33 GOX Tank", mass_lbm=179.4,
PVOW_inp = 0.51E6, MEOP_based=1,
vfree=18300.0,ell=1.767,rcyltd=1.445,
ptank=5000.0,sf=1.5,cxw=1.0,
inpex=1,expefi=0.98,
tliner=0.03,rholiner=0.098)
print oxekv.getMassStr()
print
print oxekv.getSummary()
|