Abstract
Cabin fires during in-flight and fires in high altitude airport have attracted a lot of attention. The previous fire tests at high altitudes were all conducted under very limited number of static pressure levels. It is important to design a controlled oxygen and pressure environment and conduct experiments to study the fire behaviors at different depressurization rates. A low-pressure chamber with oxygen and pressure control of 2×3×4.65m 3 in volume is developed and built to simulate high-altitude environment. Pool fire experiments using 20-cm and 30-cm-diameter pans are performed at three different depressurization rates, e.g. 5.46kPa/min, 10.92kPa/min, and 19.68kPa/min. The parameters measured include burning rate, flame temperature, radiative heat flux, and heat release rate, et al. The results from fire experiments under different depressurization rates demonstrate the difference and impacts of dynamic pressure environment on liquid fire behaviors and helpful for fire prevention during the flight of the aircraft.
Highlights
In recent years, the global aircraft accidents occur frequently, while most of aviation accidents are accompanied by combustion and explosion
With the highaltitude fire lab built in Lhasa, China, Li [2] and Fang [3] tested different sizes of n-Heptane pool fires, the results of which showed that the burning rate at higher altitude is lower, so is the flame radiation; but the flame temperature is slightly higher at higher altitude and the soot volume fraction decreases with pressure as ~P0.9
Parameters such as mass burning rate, flame temperature, radiative heat flux, oxygen concentration and heat release rate et al are all measured to reveal the mechanism of dynamic pressure effect on pool fire behavior
Summary
The global aircraft accidents occur frequently, while most of aviation accidents are accompanied by combustion and explosion. In order to further observe fire behaviors and comprehensively reveal the dependence of fire behavior on pressure, a large size low-pressure chamber with ventilation control of 2×3×4.65m3 in volume is developed and built in Tsinghua University to simulate more realistic high-altitude environment, in which oxygen concentration can be maintained through adjusting the air flow and ventilation rate. N-heptane pool fire tests under dynamic pressure were conducted in the 2×3×4.65m3 chamber to comprehensively reveal the dependence of fire behavior on depressurization rates. Using 20-cm and 30-cm-diameter pans are configured at three different dynamic pressures Parameters such as mass burning rate, flame temperature, radiative heat flux, oxygen concentration and heat release rate et al are all measured to reveal the mechanism of dynamic pressure effect on pool fire behavior
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