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!
! CalculiX - A 3-dimensional finite element program
! Copyright (C) 1998-2015 Guido Dhondt
!
! This program is free software; you can redistribute it and/or
! modify it under the terms of the GNU General Public License as
! published by the Free Software Foundation(version 2);
!
!
! This program is distributed in the hope that it will be useful,
! but WITHOUT ANY WARRANTY; without even the implied warranty of
! MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
! GNU General Public License for more details.
!
! You should have received a copy of the GNU General Public License
! along with this program; if not, write to the Free Software
! Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
!
! this function enable to determine the discharge coefficient of bleed
! tappings
!
subroutine cd_bleedtapping(ps2,ps1,ps1pt1,nummer,curve,x_tab,y_tab
& ,cd)
!
!
! in : SImultation of the secondary air system of aero engines
! K.J.KUTZ T.M. SPEER
! Transactions of the ASME vol.116 April 1994
!
! author: Yannick Muller
!
implicit none
!
integer nummer,id,i,number,curve,index
real*8 x_tab(15),y_tab(15)
!
! Fig.7 tapping with lip
!
real*8 cdx1(9)
data cdx1
& /0.24d0,0.52d0,0.8d0,1.14d0,1.42d0,1.9d0,2.5d0,3d0,3.4d0/
!
real*8 cdy1(9)
data cdy1
& /0.167d0,0.310d0,0.467d0,0.611d0,0.711d0,0.789d0,0.833d0,
& 0.866d0,0.888d0/
!
! Fig.7 tapping without lip
!
real*8 cdx2(7)
data cdx2
& /1.0d0,1.14d0,1.42d0,1.9d0,2.5d0,3.0d0,3.4d0/
real*8 cdy2(7)
data cdy2
& /0.d0,0.122d0,0.377d0,0.7d0,0.766d0,0.769d0,0.772d0/
real*8 ps2,ps1,dab,ps2pt1,ps1pt1,cdy(15),cd,cdx(20),
& dabmax
!
ps2pt1=ps2/ps1
dabmax=100.d0
!
if(nummer.eq.0) then
if (curve.eq.1) then
index=9
write(*,*)
write(*,*) 'Cd calculations will be performed using'
write(*,*) 'Cd-Kurven HP3 Schlitz;Kurve Nr. 1'
do i=1,index
cdx(i)=cdx1(i)
cdy(i)=cdy1(i)
enddo
!
elseif(curve.eq.2) then
index=7
write(*,*)
write(*,*) 'Cd calculations will be performed using'
write(*,*) 'Cd-Kurven HP3 Schlitz;Kurve Nr. 2'
do i=1,index
cdx(i)=cdx2(i)
cdy(i)=cdy2(i)
enddo
!
elseif(curve.gt.2) then
write(*,*)
write(*,*) 'no characteristic available under this index'
write(*,*) 'cd is implicitly assumed equal to 1'
cd=1.d0
return
endif
!
! psvptv ratio between the static pressure in the main canal
! and the total pressure in the main canal
!
! check whether ps1/pt1 less than 1 , if not then a warning is sent and
! the calculation will peroceed with an "oversized" dab
!
if(abs(1.d0-ps2pt1).le.dabmax*(1.d0-ps1pt1)) then
dab=(1.d0-ps2pt1)/(1.d0-ps1pt1)
else
dab=dabmax
write(*,*) 'in cd_bleedtapping.f: ps1/pt1=',ps1pt1
write(*,*) 'the calculation will proceed with DAB=100.'
endif
!
! determination of cd with the caracteristics
!
call ident(cdx,dab,index,id)
if(id.eq.1) then
cd=cdy(1)
elseif(id.ge.index) then
cd=cdy(index)
else
cd=cdy(id)+(cdy(id+1)-cdy(id))
& *(dab-cdx(id))/(cdx(id+1)-cdx(id))
endif
!
else
if(abs(1.d0-ps2pt1).le.dabmax*(1.d0-ps1pt1)) then
dab=(1.d0-ps2pt1)/(1.d0-ps1pt1)
else
dab=dabmax
write(*,*) 'in cd_bleedtapping.f: ps1/pt1=',ps1pt1
write(*,*) 'the calculation will proceed with DAB=100.'
endif
call ident(x_tab,dab,nummer,id)
if(id.le.1d0) then
cd=y_tab(1)
elseif(id.ge.nummer) then
cd=y_tab(nummer)
else
cd=y_tab(id)+(y_tab(id+1)-y_tab(id))
& *(dab-x_tab(id))/(x_tab(id+1)-x_tab(id))
endif
endif
return
end
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