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7/27/2019 Analytical Model of an Oil-Free Screw Compressor (1)
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Purdue University
Purdue e-Pubs
International Compressor Engineering Conference School of Mechanical Engineering
1980
Analytical Model of an Oil-Free Screw Compressor J. Brablik
Follow this and additional works at: hp://docs.lib.purdue.edu/icec
Brablik, J., "Analytical Model of an Oil-Free Screw Compressor" (1980). International Compressor Engineering Conference. Paper 418.h //d l b d d / /
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h
.tdlll JIPI ~ ~ ~ >\ 1' )
'
I -
,,',
SCREW' C0!1PRESSORS C fD -SR f1 Z If 204
FIGURE 1
7/27/2019 Analytical Model of an Oil-Free Screw Compressor (1)
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100
_t
Vr 50
0 ex,
0,4
0,3
PK 0,2
[/1Pal 0,1
0
0
0,4
0,3
0,2
~ Q M
0,1
0
0(.3 cx cx2 0(4
r/GURE 3
p-t DIAGRA/1
60 120
0 ( [ " ]
180
15
10
5
Pr
ex
r/CURE 4
240 300
0 ( (Oj
360
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w 0' \
tv
0,4- T p-t DIAGRAN
0,3
PK
02
lNPol '
Os1 l 0
0 60 120
014
q3
dQ 012
-dt 011
0
\1 I I 0(["]
cm}sJ 320 360
-0,1
-0 21 ' bAS f"LO'W JN I
DISCH. CHANBER
180
15
10
PK-PV 5
Py 0
- 5
- 10
-15
FIGURE 6
240 300
ex CJ
360
GAS PULSATION IN
DISCH. CI-IANBER
0 ( {G 1
360
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w 0'\
w
SUCKED VOLUf1E OF AIR PER HOUR
3000
' ' " 800-L ' 96=0,95
Vs
2600 3
fm 'lhourl 2400
* . =2643
" "
m3/hour
-3E 200 0 1 2 3·10 _)
TE11PERA TURE Or AIR .IN DISCHARGE CHA118ER
520
500
r.y 480
c·KJ 460
/............
/ /
* - · -T y= 48 0 •!f
I •3 440 2 3·10 f I
FIGURE ;r
.. * Vs1 Tv -measured values 1
?
1
0,.9- +
0,81 0,7
= qg5
7[;1/= 3,6
\ 7fa-= 4 ., .,
' ' ......... .......
........... ......... .....
---- -------= ~ ..,,.,...,.. _...
.... -· ; ....
,; //
/
/
600
Ty
500
[ • f ( ]
l 400
0,6L
0 ,5 50 100 150 n lHzJ
E 0 -3 .) = ,92·10 - ~ .5 = 1,53·10
3 ---j = 2,14·tt5
3 -·- ·- · FIGURE 8
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I 0,25
--·
0,20
A 0/5
[ 11PoJ O,fO _
ops
0
0 0'\
q25
q20
--0,10
0,0 5
0
0
/[in = 2,4 7fex = 2
60
Tfin = 3 lLex = 2
60
p - f DIAGRANS WITH DIFFERENT RA T/0 1fin /1l
l
()(, [OJ
120 180 240 300 360
p< [OJ
o ___ __ _____ _j__
1
, - - - ~ - - - -. --- --.-- -- - -- ..
120 180 240 300 360
FIGURE 9 I.