Accession Number : AD0919346

Title :   Evaluation of Fuel Fog Inerting Concepts

Descriptive Note : Final rept.

Corporate Author : BOEING CO SEATTLE WA

Personal Author(s) : Laustsen, Russell ; Bristow, Robert

PDF Url : AD0919346

Report Date : Apr 1974

Pagination or Media Count : 49

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.

Descriptors :   *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

Subject Categories : Safety Engineering
      Combustion and Ignition
      Fuels

Distribution Statement : APPROVED FOR PUBLIC RELEASE