ACME
Advanced Combustion via Microgravity Experiments
Other · CIR
Research brief.
From the NASA challenge brief
Six experiments on flames of gaseous fuels, all run on the same modular hardware in the Combustion Integrated Rack. They include the Burning Rate Emulator (materials flammability), Cool Flames Investigation with Gases (up to 85% oxygen) and E-FIELD Flames.
studies of soot processes, flame dynamics, and low-temperature combustion
study focused on material flammability
investigation of electric-field effects
exploration of flames at the extremes of high sooting and high dilution
AI synthesis.
Across every indexed paper for ACME
The AI backend isn't connected, so summaries can't be generated right now.
What the experiments revealed.
12 of 27 extracted findings · verified first, then by AI confidence
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01
ACME project conducted six independent investigations of laminar, non-premixed flames of gaseous fuels on the ISS between Nov. 2017 and Feb. 2022.
Other · NTRS 20220015583 · p. 1 · AI confidence 98% · Unverified
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02
Electric-field effects were investigated using voltages of either polarity up to 10 kV.
Other · NTRS 20220015583 · p. 1 · AI confidence 98% · Unverified
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03
Porous spherical burners yielded a nominally one-dimensional flame structure.
Other · NTRS 20220015583 · p. 1 · AI confidence 95% · Unverified
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04
Large flames increase in size over time until they extinguish due to radiative heat loss.
Suppression · NTRS 20210022542 · p. 8 · AI confidence 95% · Unverified
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05
Sooty microgravity flames are taller and wider and contain 5x to 8x more soot than equivalent 1G flames.
Other · NTRS 20210022542 · p. 5 · AI confidence 95% · Unverified
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06
Microgravity increases the limits of fuel dilution, allowing for lifted flames at lower fuel concentrations.
Other · NTRS 20210022542 · p. 5 · AI confidence 95% · Unverified
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07
Very small flames have low radiative loss and asymptotically approach steady-state behavior.
Other · NTRS 20210022542 · p. 8 · AI confidence 95% · Unverified
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08
Microgravity flames self-extinguish in oxygen concentrations below approximately 25% by volume.
Prevention · NTRS 20210022542 · p. 4 · AI confidence 95% · Unverified
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09
Low-momentum microgravity flames can burn for minutes in the absence of an air flow or flame spread.
Prevention · NTRS 20210022542 · p. 4 · AI confidence 95% · Unverified
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10
Space-based testing is necessary for combustion research because aircraft test durations are too short for quasi-steady soot conditions and are affected by g-jitter.
Other · NTRS 20210021781 · p. 2 · AI confidence 95% · Unverified
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11
Larger BRE flames generally self-extinguish within 1.5 minutes, while smaller flames can burn for minutes at elevated oxygen concentrations.
Prevention · NTRS 20210021781 · p. 8 · AI confidence 95% · Unverified
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12
BRE flames self-extinguish in oxygen concentrations below approximately 25% by volume.
Prevention · NTRS 20210021781 · p. 8 · AI confidence 95% · Unverified