point of contact :doug ingerson department of transportation federal aviation administration wj...
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Slide #3 Federal Aviation Administration ~ WJ Hughes Technical Center Fire Safety Branch, AAR-440 ~ Atlantic City Int’l Airport, NJ USA International Aircraft Systems Fire Protection Working Group 23-24June2005London, England OVER-PRESSURE ANALYSIS PENDING OVER-PRESSURE ANALYSISTRANSCRIPT
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Point of Contact : Doug Ingerson
Department of TransportationFederal Aviation Administration
WJ Hughes Technical CenterFire Safety Branch, ATO-P (formerly AAR-440)
Bldg 205Atlantic City Int'l Airport, NJ 08405 USA
tel: 609-485-4945fax: 609-485-7074
email: [email protected] page: www.fire.tc.faa.gov
Federal Aviation Administration ~ WJ Hughes Technical CenterFire Safety Branch, AAR-440 ~ Atlantic City Int’l Airport, NJ 08405 USA
International Aircraft Systems Fire Protection Working Group23-24June2005 London, England
Engine Nacelle Halon Replacement
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Federal Aviation Administration ~ WJ Hughes Technical CenterFire Safety Branch, AAR-440 ~ Atlantic City Int’l Airport, NJ 08405 USA
International Aircraft Systems Fire Protection Working Group23-24June2005 London, England
PRESENTATION CONTENTS
OVERVIEW OF PENDING ANALYSIS FOR THE OVER-PRESSURE BEHAVIOR IN THE NACELLE FIRE SIMULATORBRIEF DESCRIPTION OF PROBLEMDESCRIPTIONS OF MODIFICATIONS TO TEST FIXTURE
NEW TELEMETRYDUCT INTERFACE BOX
TEST PLAN INITIAL OBSERVATIONS
GENERIC STATUSTESTING REMAININGTABLE OF CALCULATED EQUIVALENT CONCENTRATIONS
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Federal Aviation Administration ~ WJ Hughes Technical CenterFire Safety Branch, AAR-440 ~ Atlantic City Int’l Airport, NJ 08405 USA
International Aircraft Systems Fire Protection Working Group23-24June2005 London, England
OVER-PRESSURE ANALYSIS
PENDING OVER-PRESSURE ANALYSIS
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Federal Aviation Administration ~ WJ Hughes Technical CenterFire Safety Branch, AAR-440 ~ Atlantic City Int’l Airport, NJ 08405 USA
International Aircraft Systems Fire Protection Working Group23-24June2005 London, England
OVER-PRESSURE ANALYSIS - OVERVIEW
DURING TESTING WITH 2-BTP & HFC-125 ANOMOLOUS BEHAVIOR WAS NOTED IN THE TEST FIXTURE
BEHAVIOR CHARACTERIZED AS AN OVER-PRESSURE AT AN ATMOSPHERIC GAP IN THE FIXTURE
WORST-CASE EXAMPLE RESULTED IN FIREBALL & AUDIBLE SIGNATURE
NO TELEMETRY ORIGINALLY LOCATED IN REGION OF INTEREST
TEST FIXTURE HAS BEEN MODIFIED TO ALLOW COLLECTION OF PERTINENT DATA
DATA TO BE COLLECTED AND SCRUTINIZED TO ASSESS MAGNITUDE AND ATTEMPT AN UNDERSTANDING
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Federal Aviation Administration ~ WJ Hughes Technical CenterFire Safety Branch, AAR-440 ~ Atlantic City Int’l Airport, NJ 08405 USA
International Aircraft Systems Fire Protection Working Group23-24June2005 London, England
~ 123 Inches
~ 240 Inches
DUCT INTERFACE.
TEST SECTION EXIT = 22” DIA
EXHAUST DUCT ENTRANCE = 33” DIA
GAP BETWEEN CIRCULAR PLANES = 8”
~ 65 Inches
FIRE ZONE
AGENT INJECTION
OVER-PRESSURE ANALYSIS, PERTINENT TEST FIXTURE GEOMETRY
AIRFLOW
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Federal Aviation Administration ~ WJ Hughes Technical CenterFire Safety Branch, AAR-440 ~ Atlantic City Int’l Airport, NJ 08405 USA
International Aircraft Systems Fire Protection Working Group23-24June2005 London, England
OVER-PRESSURE ANALYSIS, PERTINENT TEST FIXTURE GEOMETRY
DUCT INTERFACE.
TEST SECTION ~ EXHAUST NOZZLE
RED DUCT
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Federal Aviation Administration ~ WJ Hughes Technical CenterFire Safety Branch, AAR-440 ~ Atlantic City Int’l Airport, NJ 08405 USA
International Aircraft Systems Fire Protection Working Group23-24June2005 London, England
OVER-PRESSURE ANALYSIS – FIXTURE MODIFICATIONS
ADDED 4 THERMOCOUPLES IN RED DUCT ALL ALONG 12:00 STARTED 2 FEET IN FROM INLET, PLACED EVERY 2 FEET BEADS ARE 8 INCHES OFF WALL
ADDED 2 STATIC PRESSURE MEASUREMENT LOCATIONS 0-5” H2O PSID (REFERENCE TO TEST BAY) 1 POINT IN TEST SECTION, 03:00, STA 522 1 POINT IN RED DUCT SECTION, 04:30, 21 INCHES IN FROM INLET USING STATIC PORTS OFF 1/8”OD PITOT-STATIC TUBES INSERTED
INTO FLOW FIELD
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Federal Aviation Administration ~ WJ Hughes Technical CenterFire Safety Branch, AAR-440 ~ Atlantic City Int’l Airport, NJ 08405 USA
International Aircraft Systems Fire Protection Working Group23-24June2005 London, England
OVER-PRESSURE ANALYSIS – FIXTURE MODIFICATIONS
ADDED 4 OPTO-ELECTRONIC DEVICES TO DETECT FLAME PROPRAGATION THROUGH TEST FIXTURE PHOTODIODE PHOTOCONDUCTIVE CIRCUITS SENSOR VALUES
0 VDC, DARK/NO FIRE 6.1 VDC, SATURATES WHEN VIEWING FLAMES OF TEST FIRE
1 VIEWS TUBE ARRAY IN FIRE ZONE REMAINING 3 LOOK AT 12:00
ENTRANCE TO EXHAUST NOZZLE EXIT OF EXHAUST NOZZLE RED DUCT
A BOX IS BEING FABRICATED WHICH WILL CLOSE OUT THE DUCT INTERFACE COMPLETELY
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Federal Aviation Administration ~ WJ Hughes Technical CenterFire Safety Branch, AAR-440 ~ Atlantic City Int’l Airport, NJ 08405 USA
International Aircraft Systems Fire Protection Working Group23-24June2005 London, England
OVER-PRESSURE ANALYSIS, TELEMETRY LOCATIONS
TYPE “K” THERMOCOUPLESTATIC PRESSURE MEASUREMENTPHOTODIODE FLAME DETECTOR
BOX TO CLOSEOUT DUCT INTERFACE
STA 551
STA 527
STA 502
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Federal Aviation Administration ~ WJ Hughes Technical CenterFire Safety Branch, AAR-440 ~ Atlantic City Int’l Airport, NJ 08405 USA
International Aircraft Systems Fire Protection Working Group23-24June2005 London, England
OVER-PRESSURE ANALYSIS – TEST PLAN
PURPOSE : TO CAPTURE THE ENVIRONMENT OF THE OVER-PRESSURE
PRODUCED BY HFC-125 TO CAPTURE THE ENVIRONMENT AS PRODUCED BY HALON 1301 CHARACTERIZE THE MAGNITUDE OF THE ENVIRONMENT ATTEMPT TO TO UNDERSTAND THE PHENOMENA
PLAN : FIRE TEST WITH HFC-125 IN CONFIGURATIONS WHERE OVER-
PRESSURES WERE PREVIOUSLY OBSERVED FIRE TEST WITH HALON 1301 IN THE SAME CONDITION RUN EACH AGENT WITH & WITHOUT THE DUCT INTERFACE
BLOCKED OUT MULTIPLE OVER-PRESSURES WILL BE CAPTURED MULTIPLE HALON 1301 FIRE TESTS PLANNED TO CAPTURE
BEHAVIOR EXACT TEST COUNT TBD
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Federal Aviation Administration ~ WJ Hughes Technical CenterFire Safety Branch, AAR-440 ~ Atlantic City Int’l Airport, NJ 08405 USA
International Aircraft Systems Fire Protection Working Group23-24June2005 London, England
OVER-PRESSURE ANALYSIS – INITIAL OBSERVATIONS
THE FOLLOWING GRAPHS ILLUSTRATE SOME OBSERVATIONS BASED ON 1.0 lbm/s 260*F VENTILATION, 0.25 GPM OIL SPRAY FIRE,
HFC-125 AT “equivalence” THE FOLLOWING BEHAVIORS WERE OBSERVED :
THIS TEST VISUALLY PRODUCED A “MINOR” OVER-PRESSURE GRAPH OF FIRE IGNITION, INITIAL VS. REIGNITION AT COMPLETION OF
REIGNITION TIME DELAY (RTD) FLAME FRONT PROPAGATION IS QUICKER DURING INITIAL IGNITION FIRE GROWTH IS QUICKER DURING REIGNITION STATIC PRESSURE PULSE IS LARGER FOR REIGNITION STATIC PRESSURE PULSE IS FRACTIONAL INCH MAGNITUDE
GRAPH OF THE COMPLETE REIGNITION TIME DELAY FLAME EXTINCTION AT RTD ONSET DOES NOT PROGRESS
LOGICALLY FLAME REIGNITION AFTER RTD PROGRESSES LOGICALLY STATIC PRESSURE HAS GREATER PULSE DURING FIRE REIGNITION
THAN DURING AGENT DISCHARGE GRAPH OF OVERALL TEMPERATURE BEHAVIOR INDICATES NOTHING
UNUSUAL
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Federal Aviation Administration ~ WJ Hughes Technical CenterFire Safety Branch, AAR-440 ~ Atlantic City Int’l Airport, NJ 08405 USA
International Aircraft Systems Fire Protection Working Group23-24June2005 London, England
OVER-PRESSURE ANALYSIS – INITIAL OBSERVATIONS, FIRE IGNITION
-1.0
-0.5
0.0
0.5
1.0
1.5
2.0
2.5
3.0
3.5
4.0
4.5
5.0
5.5
6.0
6.5
7.0
-32 -31 -30 -29 -28 -27
TIME (SEC)
PHOTODIODE, TUBE ARRAY (VDC)
PHOTODIODE, EXH NZL ENTRANCE (VDC)
PHOTODIODE, EXH NZL EXIT (VDC)
PHOTODIODE, RED DUCT (VDC)
STATIC PRES., TEST SECTION ("H2O)
STATIC PRES., RED DUCT SECTION ("H2O)
lfhs 05 509 10 c4
-1.0
-0.5
0.0
0.5
1.0
1.5
2.0
2.5
3.0
3.5
4.0
4.5
5.0
5.5
6.0
6.5
7.0
6 7 8 9 10 11
TIME (SEC)
lfhs 05 509 10 c6
FIRE IGNITIONAT START OF TEST
NO FIRE
FIREREIGNITIONAT THE ENDOF THE RTD
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Federal Aviation Administration ~ WJ Hughes Technical CenterFire Safety Branch, AAR-440 ~ Atlantic City Int’l Airport, NJ 08405 USA
International Aircraft Systems Fire Protection Working Group23-24June2005 London, England
OVER-PRESSURE ANALYSIS – INITIAL OBSERVATIONS, COMPLETE RTD
-1.0
-0.5
0.0
0.5
1.0
1.5
2.0
2.5
3.0
3.5
4.0
4.5
5.0
5.5
6.0
6.5
7.0
1 2 3 4 5 6 7 8 9 10 11
TIME (SEC)
-20
30
80
130
180
230
280
330
380
430
480
530
580
630
680
730
780
PHOTODIODE, TUBE ARRAY (VDC)
PHOTODIODE, EXH NZL ENTRANCE (VDC)
PHOTODIODE, EXH NZL EXIT (VDC)
PHOTODIODE, RED DUCT (VDC)
STATIC PRES., TEST SECTION ("H2O)
STATIC PRES., RED DUCT SECTION ("H2O)
FIREX PRESSURE (psig)
lfhs 05 509 10 c7
HFC-125 DISCHARGE BEGINS
FIRE EXTINCTION
FIRE REIGNITION
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Federal Aviation Administration ~ WJ Hughes Technical CenterFire Safety Branch, AAR-440 ~ Atlantic City Int’l Airport, NJ 08405 USA
International Aircraft Systems Fire Protection Working Group23-24June2005 London, England
OVER-PRESSURE ANALYSIS – INITIAL OBSERVATIONS
0100200300400500600700800900
1000110012001300140015001600170018001900200021002200230024002500
0 15 30 45 60 75 90 105 120 135 150 165
Time (s)
Tem
pera
ture
(°F)
& P
ress
ure
(psi
g)
0200400600800100012001400160018002000220024002600280030003200340036003800400042004400460048005000
HW
A S
igna
l (m
VD
C, b
lue
trace
onl
y)
ave_sta331 ave_sta453 ave_sta518 ave_sta532 ave_sta551_upr sen/FRX botl p/t exh/___/t/rdct2ft exh/___/t/rdct4ft exh/___/t/rdct6ft exh/___/t/rdct8ft tst/515/t/hsfcT_A sen/Inlt HWA
ftst 05 509 10 c2
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Federal Aviation Administration ~ WJ Hughes Technical CenterFire Safety Branch, AAR-440 ~ Atlantic City Int’l Airport, NJ 08405 USA
International Aircraft Systems Fire Protection Working Group23-24June2005 London, England
OVER-PRESSURE ANALYSIS – INITIAL OBSERVATIONS
THERE ARE NO CONCLUSIONS TAKEN FROM THIS ONE TEST, JUST OBSERVATIONS
MORE TESTING TO BE COMPLETED PRIOR TO ANALYSIS
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Federal Aviation Administration ~ WJ Hughes Technical CenterFire Safety Branch, AAR-440 ~ Atlantic City Int’l Airport, NJ 08405 USA
International Aircraft Systems Fire Protection Working Group23-24June2005 London, England
CONCLUSION
SUMMARY/STATUS
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Federal Aviation Administration ~ WJ Hughes Technical CenterFire Safety Branch, AAR-440 ~ Atlantic City Int’l Airport, NJ 08405 USA
International Aircraft Systems Fire Protection Working Group23-24June2005 London, England
CONCLUSORY STATEMENTS
TESTING REGARDING CHARACTERIZING OVER-PRESSURE BEHAVIOR REQUIRES COMPLETION
REMAINING CF3I EQUIVALENCE ITERATIONS WILL FOLLOW POOL FIRE WORK SPRAY FIRE WORK
COLD AGENT TESTING
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Federal Aviation Administration ~ WJ Hughes Technical CenterFire Safety Branch, AAR-440 ~ Atlantic City Int’l Airport, NJ 08405 USA
International Aircraft Systems Fire Protection Working Group23-24June2005 London, England
RESULTS TO DATE - TABULAR
Agent Ventilation configuration Fire Threat Equivalent
Concentration (%v/v)
HFC-125high
JP8 spray 17.5JP8 pool 7.6
LowOIL spray 16.4 (a)JP8 pool 8.1 (a)
CF3IHigh
JP8 spray 5.6JP8 pool Incomplete
Low OIL spray 7.2 (a,b)JP8 pool Incomplete
(a) Bracketing method used to find mass equivalent(b) Partial result, JP8 verification incomplete as of June 2005