文档介绍:Fuel Tank Ignition Studies at Reduced Pressures & Oxygen Concentrations
Steven M. Summer
International Aircraft SystemsFuel Tank Ignition Studies at Reduced Pressures & Oxygen Concentrations
Steven M. Summer
International Aircraft Systems Fire Protection Working Group
August 29, 2000
Goals
To determine the oxygen concentration needed to fully inert a fuel tank at different altitudes
To quantify the difference in severity of the fuel tank ignitions, both at altitude and reduced oxygen concentration
Experimental Apparatus
9 ft3 fuel tank placed within 10 m3 pressure chamber
Heater placed on bottom of tank
Vacuum pump used to evacuate chamber to simulate desired altitude
14 thermocouples – fuel, ullage, walls & floor
Pressure Transducers – peak & quasi-static
Analyzers – HC (2 ports) & O2
Test Program
Preliminary Methane Tests
Determine LFL of Methane at Sea Level and compare to numbers cited in literature
Determine oxygen concentration needed to fully inert a fuel tank at:
Altitudes ranging from
0 – 40 kft &
corresponding temps
Several different mass
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