Seal related development activities including modeling, analysis, and performance testing are described for several current seal related projects. Among the current seal related projects are the following: high pressure gas sealing systems for turbomachinery; brush seals for gas path sealing in gas turbines; and tribological material evaluation for wear surfaces in sealing systems

Greiner, Harold F.

English

NASA Technical Reports Server

N92-15095
SEAL RELATED DEVELOPMENT ACTIVITIES AT EG&G
H,F. Griner
Fluid Components Technology Group
EG&G
A brief introduction is made describing EG&G Fluid Components Technology Group
and FCT Group R&D capabilities.
Seal related development activities, including modeling, analysis and
performance testing are described for several current seal related projects.
These include noncontacting, high speed, high pressure gas sealing systems for
turbomachinery, brush seals for gas path sealing in gas turbines and
tribological material evaluation for wear surfaces in sealing systems.
GROUP R&D
Staffed and equipped (or:
Material Characterization and Analysis
Tribological Characteristics, Testing and Evaluation
High Temperature, High Pressure and High Speed Testing
of Seals and Sealing Systems
Mechanical Design of Products and Specialized
Testing Equipment
Modeling of Systems and Components, Design Analysis
and Performance Parameters
Manufacturing Process Development
113
https://ntrs.nasa.gov/search.jsp?R=19920005877 2020-03-24T07:05:57+00:00Z
ADVANCED AEROSPACE
TEST RIG
Rig Capabilities (Counter Rotating
Configuration)
- Spiudk- Speed/24,000 RPM each shaft
- Power/43 HP at 17,000 RPM. 32 HP at 26.000
RPM
- Temperature of Test Cliamber/GOO°F
- Test Chamber Pressure/100 PSI
- Axial Travel/±.0625 inch each shaft
Single Shaft (Brush Seal Testing)
- Spindle Speed/24,000 RPM
- Power/43 HP at. 17,000 RPM. 32 HP as 2h.OOD
Ili-'M
- Temperature of Test Chamber / 100'i'F
- Test Chamber Pressure/ 100 PSI
- Axial Travel/±.OG25 incites
*ypfc^^o——i r, t-FZ-f- '^tH, hiVy-n-^ ) ' -flCi-.^ |^ W J .
114
ORIGINAL PAGE JS
OF POOR QUALFTY
SEAL RELATED DEVELOPMENT ACTIVITIES
BRUSH SEAL DEVELOPMENT PROGRAM
U. S. AIR FORCE PRDA-11
IN-HOUSE BRUSH SEAL TESTING
NON-CONTACTING GAS FILM SEALS
DEVELOPMENT AND TESTING
TRIBOLOGICAL MATERIAL EVALUATION
ANALYSIS AND TRIBOLOGICAL TESTING
Brush Seal Development Program \
U. S. Air Force
Integrated High Performance Turbine Engine Technology — IHPTET
PRDA -II
Objective: Develop a comprehensive design methodology (or Brush Seals
using
1. Application requirements from engine manufacturer
2. Experimental characterization of seal design and triboiogical pairs
Goals: 1. Substantially lower leakage than laby seals
2. Seal life consistent with man -rated mission requirements
3. Achieve maximum pressure sealing capability with single or
multiple stages
Provide: 1. Comprehensive seal design manual
2. Man-rated brush seal for test in an IHPTET engine
Project duration is two and one half years, started July 1990
115 ORIGINAL PAQf ?§•
OF P008 QUALITY
PACK IVI Dili I
BACKING %
WASHLR \
r
0D,
0Dh
_
 M(MT MIN.
TYP
FREE U:NGTI
RETAINING
WASHER
•COVER PLATE
OR
SIDE PLATE
0Dr
00:
WIRE DIAMETER- d
TOTAL NUMBER OE BRISTLES- n,
WIRE DENSJTY-jD
BRUSH SEAL ASSY.
FLOW PARAMATER VS DP/P. COMPARISON OF BRUSH SEAL
AND LABYRINTH SEAL LEAKAGE
_ o
t/1 2
O <n
U) o
'
Ul o
\— 10
< o
LEGEND
D = EPD TESTS 5500 RPM
o = EPD TESTS 9700 RPM
^ = EPD TESTS 11600 RPM
+ = EPD EH TESTS 6K-15K RPM
x - TELEDYNE TESTS 30000 RPM
o = EPD 6 FIN LABY (.025 GAP)
? = ALLISON 4 FIN (.02 GAP)
O.i
116
ORIGINAL PAGE IS
OF POOR QUALITY
BRUSH SEAL LEAKAGE VS PRESSURE DROP
0.8 0.9
LEGEND
a = EPD TESTS 5500 RPM
o = EPD TESTS 9700 RPM
A = EPD TESTS 11600 RPM
+• = EPD EH TESTS 6-15K RPM
x = TELEDYNE TESTS 30000 RPM
o = TELEDYNE TESTS 30000 RPM
DP/P
Oil IN
rui'xe.m i lijtu
Tost •;«! />^ in tit: a 1 I (M! In
Scale. ;; T"si Hic j
117
PAGE !S
OF POOR QUALITY
num-:i( CAS TNHOUGII FII.TKKS
GAS LEAKAGE TO STACK
PATENT PENDING
Tandci Ciis Fdce Sciil - Sliuwn in Tlu:i ooilyn i.'.inlri tui;iil (;^s Coafii
Oil. 1JHA1N I J U F F E R G A b Ul'I-'EII GAS
AT BOTTOM L E A K A G E »N,,TYK)
POSITION (TO STACK AT I'systcnl + £. P
IF FLAMABLE)
PROCESS • S
AT PsysU-m
DAMPING DEVICE
FLUID
F I L M
i . ' l l tCUMFEK- FINGEI1 S P l i l N c ;
KNT1AL L E A K A G E CENTE1IING
CONTKOI. S K A L DE\'ICE (TYI!)
I I U K F E I t G A S
ri.uw INTO
METAL BELLOWS GAS SEAL (PATENT P E N D I N G )(BUFFER GAS A I I R A N G E M E N T )
118
ORIGINAL PAGT IS
OF POO^ 0".ft! TTY
SEAL L E A K A G E OUT
TEMR AMD PRESS.
MEAS.
HIC I PRESS. CAS IN
Til IIKAT 'IXCIIANIiKU '.EMBAHO PRESS.
MCAS. X; TO Bli CLOSED
[••ROM MEAT EXCHANGER
Dynamic Tesi. Arr,-]|ii;finioi)i. <>r a T h i n l i n e Gns Seal
Energy Dissipation vs. Pressure
Single, data per pod
o —
7 —
n: 6 —
1 5-E
oo 4 —
00
Q J
s 5iCC
2 2 -:
SPEED
A 5000 RPI.1
B 7500 RPM
^ 12500 RPM
0 MOOO RPM
» 15000 RPM
+ 16000 RPM
15500 RPM
\^
^^^^ ^1
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0
 J
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_ M H •• , » A
« . . - 7 T A A * •* f -f "A — " — If
— n ' — t 1 — t — < 1 — r — i — i ' —
100 500 700 900
SYSTEM PRESSURE PSIG
1100 1300 1500
119 OF POOF? QUALITY
Inlet Temperature vs. Pressure
Single, data of POD 2
'NJU -T-
350-
u_
O
£ 300-
UJ
££ 9 en
Z3 i ~*U
<f -
o:
a! 200-
UJ
1 I
100-
,-
SPEED
A 5000 RPU
B 7500 RPI.I
^ 12500 RPU
9 14000 RPU
8 15000 RPH
+ 16000 RPU
*
15500 RPH
\
\
\
— -+ — _K^- — "'
+ + "^ ^--*-~~~*~~
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, " • ; * "
 A
1 1 1 i ! 'I I I 1 1 1
100 300 500 700 900
SYSTEM PRESSURE PSIG
100 1300 1500
Leakage vs. Pressure
Single, data of POD
1 ."! —
1.2-
-
•^
b^
 0.8-
UJ
^ 0.6-
<t
SPEED
'. A 2500 RPU .„-« <
• 5000 RPU ,--•-""*"
— ,, •'
4 7500 RPM •----•"" •'•"
8 12500 RPU ,•-"" ,-*-•'"*'
^--' ..*-•
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100 300 500 700 900 1100 1300 15C
SYSTEM PRESSURE PSIG
120
ORIGINAL PAGE 8S
OF POOR
Leakage vs. Pressure
o
Single, data of POO
1.4
1.2
1.0
0.3 —
0.6
0.4 -
0.2 -f^
0.0 -:
*' /
'
 /
 •'
|
100 300
.•••-" ,-•-
-I-
500 . 700 900 1100
SYSTEM PRESSURE PSIG
15000 RPM
and
15500 RPM
?500 i.-uu
o(/->
<
a:
Leakage Correlation
Single, data of POO I
1.6
LEGEND
A. 5000RPU. TEST
B 5000RPM, CALC.
$ 7500RPM. TEST
• 7500RPM, CALC.
X 12500RPM, TEST
+ '2500RPU, CALC.
500 700 900
SYSTEM PRESSURE PSIG
100 1300 1500
121 QRfGSWAL PAGE IS
OF POOR QUALITY
Leakage Correlation
Single, data of POD
o(-0
Cd
<C
LEGEND
I4000RPM. TESr
14000RPM, CALC.
15000RPM. TEST
15000RPM. CALC.
16000RPM. TEST
16000RPM, CALC.
0.0 -
100
p=-
r |1 ! 1 1 | 11 t1 t1 - -••
300 500 700 900 1100
SYSTEM PRESSURE PSIG
1300 1500
Unique Tribology Test Rig3
High Temperature
Oscillating Test Rig
Two unique test rigs have been designed to evaluate the wear
and friction of materials for aerospace sealing applications.
The first is a high temperature, oscillating rig used for
tribological testing of materials for slide joints, static seals,
solenoid valve plungers and similar aerospace applications
exhibiting fretting type wear. It was designed and built at Group
R&D to accurately record variations in the normal and tangential
loads under oscillating conditions at temperatures up to 1400°.
the design of this rig uses a programmable motor which can
duplicate acceleration and velocity profiles of various oscillating
and low speed unidirectional motions. • the test samples are
enclosed in a furnace which can be -purged using various
atmospheres. A pneumatic loading system is designed to achieve
high contact pressures (500 psi), applied pneumatically.
122
High Speed-High Temperature
Test Rig
The second is a high speed/high temperature rig designed to
test materials for main shaft and gas-path seal applications where
high surface speeds of up to approximately 400 feet per second at
a shaft rotation of 60,000 rpm and light loads up to 2psi are used
for testing.
 flThis rig has the capability of heating the tribo-
pairs to 1200 while maintaining precise alignment at the seal
interface. Loading of the seal face is accomplished using gas
pressure applied to a bellows assembly such that precise increments
of pressure can be selected for test purposes. This test rig is
currently being used to investigate appropriate tribo-pairs for
brush seal fibers and runners.
FRICTION QF CARBON GRAI'IIITI' AT HIGH 'IT-MIM-RATURES
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CARBON
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CARHON
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0 200 400 60 i
T emp e r a tu r e (C)
800
123 OBIGWAL PAGE BS
OF POOR QUALITY
WIIAR OP CARBON GRAPIUTi:-; AT I IKil I THMPEUATUKl-
HUU -
350 -
300-
^250-
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,
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CARBON /
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CARBON
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V1ANF. TliMP.
/ JJMIT FOR A
///
•
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...a •^•"Z \£
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T
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MANF. TI-MP.
I.IN;IT I-OR n
30
T e m p e r a t u r e ( C )
124


Seal Related Development Activities at EG/G

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