CFI
Cool Flames Investigation
Other · CIR / MDCA
Research brief.
From the NASA challenge brief
Burned droplets of liquid fuel in the Multi-user Droplet Combustion Apparatus inside the Combustion Integrated Rack.
simulate temporal evolution of flame temperature and radius
investigate the effects of ambient pressure on radiative heat losses in hot, warm, and cool microgravity spherical diffusion flames
stability and structure of gas-fueled flames
flammability of solid fuels
AI synthesis.
Across every indexed paper for CFI
The AI backend isn't connected, so summaries can't be generated right now.
What the experiments revealed.
12 of 54 extracted findings · verified first, then by AI confidence
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01
Warm flames established at pressures of 4 atm or higher radiatively extinguish before a cool flame is established.
Suppression · NTRS 20260002014 · p. 4 · AI confidence 95% · Unverified
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02
Hot flames radiatively extinguish at pressures less than 4 atm, while at 4 atm or higher they transition to warm flames.
Suppression · NTRS 20260002014 · p. 4 · AI confidence 95% · Unverified
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03
As ambient pressure increased, H2O contributed more to radiative loss than CO2 in both experiments and computations.
Other · NTRS 20260002014 · p. 1 · AI confidence 95% · Unverified
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04
In microgravity droplet experiments, the fraction of total radiation coming from water vapor increased as ambient pressure increased during the hot flame.
Detection · NTRS 20260002014 · p. 2 · AI confidence 95% · Unverified
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05
Microgravity flames of gaseous fuel can sustain steady burning despite radiative heat loss.
Other · NTRS 20250001364 · p. 1 · AI confidence 95% · Unverified
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06
Excessive radiative heat loss in microgravity often leads to an absence of soot and oscillations that cause quenching.
Suppression · NTRS 20250001364 · p. 1 · AI confidence 95% · Unverified
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07
Non-premixed cool flames were discovered during droplet combustion research and later observed in gaseous fuel tests.
Detection · NTRS 20250001364 · p. 1 · AI confidence 95% · Unverified
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08
CIR experiments have been conducted for 14 independent experiments involving researchers from the US, Italy, Japan, and Russia.
Other · NTRS 20250001364 · p. 1 · AI confidence 95% · Unverified
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09
The limiting oxygen index (LOI) for methanol droplet combustion is approximately 12-13% oxygen at atmospheric pressure.
Prevention · NTRS 20210022617 · p. 4 · AI confidence 95% · Unverified
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10
Cool flames produce partially oxidized fuel that can potentially re-ignite to hot flames, posing fire safety concerns in spacecraft.
Prevention · NTRS 20210022617 · p. 14 · AI confidence 95% · Unverified
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11
Quasi-steady cool flames were discovered during normal-alkane fuel droplet combustion onboard ISS in the FLEX experiments.
Detection · NTRS 20205008449 · p. 1 · AI confidence 95% · Unverified
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12
Xenon decreases burning rates substantially but can sustain cool flames at much lower oxygen concentrations compared to helium.
Other · NTRS 20205008449 · p. 10 · AI confidence 95% · Unverified