Aeronautics and. Space Administration. Lyndon. B. Johnson. Space Center. Houston,. Texas. 77058. â¢. L ". II. NASA CR-185595 i. Y i. =- DEMONSTRATION. OF.
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II
N/ A National Space
Aeronautics
and NASA CR-185595
Administration
Lyndon B. Johnson Space Center Houston, Texas 77058
i
Y i
=-
DEMONSTRATION
OF
FLUORESCENCE
THE FOR
FEASIBILITY ARC
JET
Job Order
OF
FLOW
LASER
INDUCED
DIAGNOSTICS
83-102
N90-16013 (NASA-CR-I_Sb95) FEASIr_ILITY
DEMONSTRATIC)N LASER INDUCED
OF
FFIR ARC JFT En,jineerin,]
FLC_W F}IAGNOSTICS an:_ Sciences Co.)
uF THE FLUORE-_CFNCE (Lockheed 29 p CSCL
Prepared Lockheed
Engineering
Uncl O7D
G)/25
as
0256751
By
& Sciences
Company
41
!
Houston, Contract
Texas
NAS 9-17900 For
STRUCTURES
AND MECHANICS
DIVISION
And ADVANCED
PROGRAMS
October
OFFICE
1989 LESC-27642
f_
NASA DEMONSTRATION
OF
THE FOR
FEASIBILITY OF LASER INDUCED ARC JET FLOW DIAGNOSTICS
Job
Order
BY
ArepalIi"
APPROVED
BY
?/y_)
LESC
T. M. Heaton, Experimental
Engineering Heat Transfer
J'--ojG"_r
supervisor Section
Dr_'GeorgetFeng',.Engineering Systems Engineering Department
and
Manager
NATIONAL
_ Transfer
__
Prepared By Engineering and Sciences
Advanced
_e Heat
Don W_d_, Structures Division
Structures
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eq x r.-E _J
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o 4.a
wu g_ 0
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0
18
C,_O _
O0
I
,tun I-
zl,_l
×gr"-_g aJ x _J
f,-
• e,,,,
19
PULSE GENERATOR ( MASTER CLOCK ) T =4 sec
DYE LASER
NALOG
EXTERNAL TRIG. ELECTRONICS FOR Nd:YAG
TRIG. OUT
OUT
CHARGE
X - Y RECORDER
Nd:YAG
Y SYN. OUT TRIG. IN OUTPUT PHOTON
COUNTER
INPUT PMT
Figure 3. Electronics block diagram
2O
+8V +8V 500 K 10 turns
p
20 K
.o_
500 t2 AAA
Ext. Trig. 10Hz c
1K
o pin 2 (charge, TTL)
+8V
Ai
+8V 10 turns 20 K 10
.30_
+8v?
).ol
41-w--_
+8V
5O0 _2 AAA
QI"_" HI
4538
_'I
12,---._
-19 _
o pin 3 ( fire, TTL ) o pin 5 ( EOC )
+8V
Figure 4. Variable
+8VO
delay
21
double-pulse
generator
o pin 4
TTL, Master Pulse 0.25 Hz
Dye Laser Trig. Out, 35 pulsesr
10 Hz
YAG Charge Command, 10Hz
YAG Fire Command, 10Hz 90 ms
YAG 10Hz
Syn. Out,
2oo_-------_
!
A
Photon 10Hz
Counter
Gates,
B
I0 l_S |
l ms----l_-I
!
Dye Laser Light Pulse, 10 I-Iz
500.s-"_.l"_-Figure
5.
Timing
diagram
for 22
LIF
data
collection
3OO
+_+_ r,q °
200 0 C)
i
_23 ©
i00
nll
,] A,
225.200
225.700
226.200 Laser
Figure
6.
LIF
of
(0,0)
226.700
WavelengLh
band
of
23
I
227.200
(nm)
NO (A-X);
free
stream;
1500
BTU/Ib
t90
(c)
3500
BTU/lb
t40 o o
90
40
-10
I
190
I
I
225.700
225.200
226.200
226.'700
(b)
227200
2500
BTU/Ib
140 o o >.,
90
ID
40
-10
!
225.200
190
I
225.700
'
'
I
226.200
226.700
227.200
(a) 1500
2
BTU//lb
I
140
o 0
t
90
,-
40
J -10
I
225.200
!
225.700
226.200
Laser
Figure
7.
LIF of different
(0,0) band enthalpy
Wavelength
of NO (A-X) conditions 24
226.700
227.200
(nm)
in
free
stream
under
2900
2400
_
1900
© 0
_
1400 I
900
LL
-100 225.200
I
T
225.700
_
I
Laser
Wavelength
Figure 8. LIF of 02 (B-X) in the shock enthalpy
t
226.200
1
226.700
,
1
227.200
(nm)
layer
of a blunt
body at an
of 1500 BTU/Ib.
25
,_A_A-J$O
