INFERNITYFLAME IN FREEFALL

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Attribute
Hardware groupACME group
Pillars
Prevention
Fuel phaseGaseous
MaterialPropane fuel with an oxygen-nitrogen oxidizer stream
ShapePorous spherical burner producing a steady spherical diffusion flame
SizeSpherical porous burner
O2 concentration85%
PressureVaried / not specified
AirflowVaried / not specified
FacilityModular ACME hardware in the Combustion Integrated Rack (CIR)
Module / vehicleInternational Space Station
Sensors
  • Color, CH* and OH* imaging
  • Thin-filament pyrometry
  • Radiometer array
  • Photomultiplier tubes for OH* and CH* emission
  • Gas chromatograph for chamber atmosphere analysis
Variables tested
  • Oxygen concentration up to 85% in the oxidizer stream
  • Fuel and oxidizer dilution
  • Steady spherical cool diffusion flame behavior
ObjectivesObserve steady spherical cool diffusion flames for the first time by feeding a gaseous fuel and an oxygen-rich stream from a porous spherical burner into the ACME chamber.
Key findings
  • Studied cool diffusion flames as steady spherical flames rather than unsteady droplet flames.
  • Reached oxygen concentrations up to 85%, the highest-O2 microgravity combustion tests in the catalog.
  • The burner arrangement creates an inside-out flame, with oxygen supplied from the sphere and a flammable gas in the chamber atmosphere.
Relevant environments
SpacesuitLunar baseSpacecraft cabin
SourceNASA PSI