Evaluation of Fuel Fog Inerting Concepts

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Abstract:

This report describes the theory and results of testing conducted to determine the feasibility of using condensate-formed fuel fog for inerting fuel tanks. The tests were performed in such a manner that the temperatures of the ullage space and one or two spray nozzles could be varied independently. A combination of spray temperatures and nozzle types was found that provided inerting over the complete range of ullage-space temperatures tested 60 F to - 55 F. Further findings for the 6-cubic-foot ullage space over liquid JP-4 fuel were that 1.0-gph nozzles were sufficient but 0.4-gph nozzles were not, neither single hot nor single cold nozzles were sufficient, and inerting would not occur for all ullage conditions except when both hot and cold nozzles were used. It was found that the hot and cold spray temperature differentials could each be at least as low as 5 F. In addition, a fuel fogging preliminary design for the AH-1G Cobra helicopter is included.

Author(s):
Laustsen, Russell ; Bristow, Robert
Author Organization(s):
BOEING CO SEATTLE WA
Descriptive Note:
Final rept.
Pagination:
0049

Security Markings

DOCUMENT & CONTEXTUAL SUMMARY

Distribution:
Approved For Public Release
Distribution Statement:
Approved For Public Release; Distribution Is Unlimited.

RECORD

Collection: TR
Identifying Numbers
Report Number(s):
USAAMRDL-TR-74-13
Contract/Grant Number(s):
DAAJ02-73-C-0087
Project Number(s):
DA-1-F-1632082-B-52
Monitor Series:
TR-74-13, USAAMRDL
 Subject Terms
Joint Capability Areas:
JCA_4.6.1_General Engineering; JCA_4.6_Engineering; JCA_3.2_Engagement; JCA_3_Force Application; JCA_1.2_Force Preparation; JCA_1_Force Support; JCA_3.2.1_Kinetic Means; JCA_1.2.6_Concepts; JCA_1.2.5_Lessons Learned; JCA_5_Command and Control
Communities of Interest:
Materials and Manufacturing Processes
Descriptor(s):
*COMBUSTION, *FIRE PREVENTION, *FOG, *FUEL TANKS, *HELICOPTERS, *JET ENGINE FUELS, AIRCRAFT, ANTIAIRCRAFT AMMUNITION, AVIATION FUELS, CONDENSATION, DROPS, FLAMMABILITY, GUNFIRE, INHIBITION, MIST, PARTICLE SIZE, SMALL ARMS, SPRAY NOZZLES, SURVIVAL(GENERAL), SYSTEMS ENGINEERING, TEMPERATURE, THERMODYNAMICS, VAPOR PRESSURE, VAPORS, VULNERABILITY
Field(s)/Group(s):
Safety Engineering, Combustion and Ignition, Fuels
Keyword(s):
AH 1G aircraft, H 1 aircraft, *Fuel fog, *Ullage
Report Date:
1974 Apr 01