Investigations
Browse the PSI investigations and their extracted conditions.
Hardware families
Hardware families as listed in the NASA Space Apps 2026 'Flame in Freefall' challenge statement: challenge statement.
- ACME: modular ACME hardware in the Combustion Integrated Rack (CIR).
- FLEX, FLEX-2 and CFI: droplet experiments in the Multi-user Droplet Combustion Apparatus (MDCA) in the CIR.
- BASS, BASS-II, SPICE and SLICE: Microgravity Science Glovebox (MSG), using the modular fan-driven flow duct built for SPICE.
E-FIELD Flames: partial gravity “was mimicked in ACME's Electric-Field Effects on Laminar Diffusion Flames (E-FIELD Flames) experiment through the effect of the electric field on the ions that naturally occur in flames.” An analog, not partial-gravity data.
24 investigations. Leg tags cite PSI quotations in the lenses data.
| Select | Investigation | Hardware | Tests | O₂ range | Pressure range | Flow | Gravity | Relevance and legs |
|---|---|---|---|---|---|---|---|---|
| PSI-10 · ACME/Flame Design | Advanced Combustion via Microgravity Experiments (ACME), Combustion Integrated Rack (CIR), Reconfiguration of Combustion Integrated Rack (CIR) | 327 | 19.8% – 40.0% | 43 kPa (6.24 psia) – 305 kPa (44.2 psia) | Not in extracted test rows | microgravity | indirect prevention | |
| PSI-20 · ACME BRE | Combustion Integrated Rack (CIR), ACME | 18 | 21.0% – 40.0% | 56 kPa (8.12 psia) – 101 kPa (14.7 psia) | Not in extracted test rows | microgravity | direct prevention | |
| PSI-21 · ACME CLD Flame | Combustion Integrated Rack (CIR), ACME | 6 | Not in extracted test rows | Not in extracted test rows | Not in extracted test rows | microgravity | indirect preventionsuppression | |
| PSI-22 · ACME E-FIELD Flames | Combustion Integrated Rack (CIR), ACME | 20 | Not in extracted test rows | Not in extracted test rows | Not in extracted test rows | microgravity | indirect | |
| PSI-23 · ACME s-Flame | Combustion Integrated Rack (CIR), ACME | 18 | 21.0% – 30.0% | 101 kPa (14.7 psia) | Not in extracted test rows | microgravity | fundamental prevention | |
| PSI-25 · BASS-II | Microgravity Science Glovebox (MSG) | 129 | 13.6% – 22.2% | 101 kPa (14.7 psia) | Not in extracted test rows | microgravity | direct detectionpreventionsuppression | |
| PSI-26 · BASS | Microgravity Science Glovebox | 116 | 15.9% – 22.7% | 98.3 kPa (14.3 psia) – 102 kPa (14.8 psia) | Not in extracted test rows | microgravity | direct preventionsuppression | |
| PSI-39 · CFI | Multi-User Droplet Combustion Apparatus (MDCA), Combustion Integrated Rack (CIR) | 79 | 17.0% – 21.0% | 50.7 kPa (7.35 psia) – 507 kPa (73.5 psia) | Not in extracted test rows | Not stated in PSI | indirect | |
| PSI-47 · DAFT / DAFT-2 | TSI P-Trak | 0 | Not in extracted test rows | Not in extracted test rows | Not in extracted test rows | Not stated in PSI | indirect detection | |
| PSI-60 · Computational and Experimental Analysis of SPICE Data Sets | Not stated in PSI | 0 | Not in extracted test rows | Not in extracted test rows | Not in extracted test rows | Not stated in PSI | indirect | |
| PSI-62 · Concurrent Flame Spread Modeling using Flamelet Generated Manifolds in Microgravity with Comparison to BASS Experiments using Two-Color Tomography | Not stated in PSI | 0 | Not in extracted test rows | Not in extracted test rows | Not in extracted test rows | Not stated in PSI | indirect prevention | |
| PSI-68 · FLEX-2 | Combustion Integrated Rack (CIR), Multi-user Droplet Combustion Appartatus (MDCA) | 8 | 17.0% – 30.0% | 50.7 kPa (7.35 psia) – 304 kPa (44.1 psia) | 0.1..5 | microgravity | fundamental prevention | |
| PSI-69 · FLEX | Combustion Integrated Rack (CIR)-Fluids and Combustion Facility (FCF), Multi-user Droplet Combustion Appartatus (MDCA) | 274 | 12.0% – 34.0% | 70.2 kPa (10.2 psia) – 309 kPa (44.9 psia) | Not in extracted test rows | microgravity | direct preventionsuppression | |
| PSI-98 · SAFFIRE-I | Saffire 1 enclosure in Cygnus | 2 | 0.215, 0.215..0.217 | Not in extracted test rows | 20 cm/s | microgravity | direct prevention | |
| PSI-99 · SAFFIRE-II | Cygnus Pressurized Cargo Module, SAFFIRE | 9 | 0.215, 0.219..0.22, 0.22..0.221, 0.221 | Not in extracted test rows | 20 cm/s | microgravity | direct prevention | |
| PSI-100 · SAFFIRE-III | Saffire III enclosure in Cygnus | 2 | 0.21..0.212 | Not in extracted test rows | 30 cm/s | microgravity | direct prevention | |
| PSI-101 · SAME-R | Comparitive Soot Diagnostic Hardware; Refer to final report | 66 | Not in extracted test rows | Not in extracted test rows | 0 cm/s – 8.1 cm/s | microgravity | direct detection | |
| PSI-102 · SAME | Comparitive Soot Diagnostic Hardware | 8 | Not in extracted test rows | Not in extracted test rows | Not in extracted test rows | microgravity | direct detection | |
| PSI-106 · SLICE | Not stated in PSI | 11 | Not in extracted test rows | Not in extracted test rows | Not in extracted test rows | Not stated in PSI | indirect | |
| PSI-107 · SPICE | Microgravity Science Glovebox (MSG) | 151 | Not in extracted test rows | Not in extracted test rows | 0.66 cm/s – 85.28 cm/s | microgravity | indirect | |
| PSI-115 · Utilization of the Smoke Aerosol Measurement Experiment Data for Advanced Modeling and Simulation of Smoke Generation in Micro-Gravity | Not stated in PSI | 0 | Not in extracted test rows | Not in extracted test rows | Not in extracted test rows | Not stated in PSI | fundamental detection | |
| PSI-117 · Effect of External Thermo-Convective Perturbation on Cool Flame Dynamics: A Multidimensional Multi-Physics CFD Analysis | Not stated in PSI | 0 | Not in extracted test rows | Not in extracted test rows | Not in extracted test rows | Not stated in PSI | indirect | |
| PSI-142 · Quantitative Studies of Cool Flame Transitions at Radiation / Stretch Extinction Using Counterflow Flames | Principal Investigator Laboratory Hardware | 0 | Not in extracted test rows | Not in extracted test rows | Not in extracted test rows | Not stated in PSI | fundamental prevention | |
| PSI-159 · ACME CFI-G | ACME, Combustion Integrated Rack (CIR) | 333 | 18.0% – 40.0% | 49.5 kPa (7.18 psia) – 331 kPa (48 psia) | Not in extracted test rows | microgravity | indirect |
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