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Reading the record, its runs and their sources.
Investigation dossier
Reading the record, its runs and their sources.
PSI recordPSI-68Investigation dossier
Flame Extinguishment Experiment - 2
PSI record (opens in a new tab)doi 10.60555/byp8-h018 (opens in a new tab)psi.nasa.gov/physci/repo/data/investigations/PSI-68
Evidence proximity, not a safety rating. This page describes what was tested and where each value comes from.
FLEX-2 has no individual runs to place.
0 of 0 runs drawn.
As written in the PSI record:
The primary goal of the FLEX-2 flight experiments is to extend the results of FLEX-1 to fuels and environmental conditions that mimic real combustor conditions, as well as, provide benchmark experimental data on bi-component droplet combustion over a wide range of initial conditions in order to validate numerical simulations and to develop new theoretical models. Detailed experimental objectives can be further itemized as: 1. Investigate the role of liquid-phase mixing on the burning characteristics of bi-component fuel droplets. 2. Examine the steady and unsteady liquid and gas-phase phenomena in pure fuel combustion. 3. Study flame extinction mechanisms and their boundaries. 4. Analyze the soot formation process, including soot volume fraction soot-shell dynamics. 5. Determine the influence of droplet interactions on the flammability limits and extinction behavior of droplet arrays. 6. Validate theoretical models of droplet combustion through comprehensive experimental data collection in microgravity environments.
PSI has summary rows only for this investigation (8 rows in PSI-68_Experimental table_Flex2.csv), not individual runs, so there is nothing to fingerprint run by run. The summary rows are listed below.
Nothing from this investigation can be placed on an O₂ × pressure chart: there are no individual runs to place.
PSI has no run-level table for this investigation: its experimental table holds summary rows only (each summarises a test series, not a single run), so nothing is placed or compared. The summary rows are listed below.
8 summary rows from PSI-68_Experimental table_Flex2.csv, as they appear in PSI.
| Row | Sample (Fuel Type) | Initial Droplet Diameter (mm) | Ambient Gas Mixture | Oxygen Mole Fraction | Ambient Pressure (atm) | Ambient Temperature (C) | Flow Velocity (cm/s) |
|---|---|---|---|---|---|---|---|
| 1 | IsoOctane (pure) | 1.5 - 5 | O2/N2 or O2/He | 0.17; 0.21;0.25; 0.3 | 0.5; 1.0; 1.5; 2.0; or 3.0 | 25 | 0.1 - 5 |
| 2 | n-Octane (pure) | 1.5 - 5 | O2/N2 or O2/He | 0.17; 0.21;0.25; 0.3 | 0.5; 1.0; 1.5; 2.0; or 3.0 | 25 | 0.1 - 5 |
| 3 | Heptane (pure) | 1.5 - 5 | O2/N2 or O2/He | 0.17; 0.21;0.25; 0.3 | 0.5; 1.0; 1.5; 2.0; or 3.0 | 25 | 0.1 - 5 |
| 4 | Decane (pure) | 1.5 - 5 | O2/N2 or O2/He | 0.17; 0.21;0.25; 0.3 | 0.5; 1.0; 1.5; 2.0; or 3.0 | 25 | 0.1 - 5 |
| 5 | Ethanol (pure) | 1.5 - 5 | O2/N2 or O2/He | 0.17; 0.21;0.25; 0.3 | 0.5; 1.0; 1.5; 2.0; or 3.0 | 25 | 0.1 - 5 |
| 6 | Propanol (95%) Glycerol (5%) (mixture) | 1.5 - 5 | O2/N2 or O2/He | 0.17; 0.21;0.25; 0.3 | 0.5; 1.0; 1.5; 2.0; or 3.0 | 25 | 0.1 - 5 |
| 7 | Heptane (50%) IsoOctane (50%) (mixture) | 1.5 - 5 | O2/N2 or O2/He | 0.17; 0.21;0.25; 0.3 | 0.5; 1.0; 1.5; 2.0; or 3.0 | 25 | 0.1 - 5 |
| 8 | Propanol (80%) Glycerol (20%) (mixture) | 1.5 - 5 | O2/N2 or O2/He | 0.17; 0.21;0.25; 0.3 | 0.5; 1.0; 1.5; 2.0; or 3.0 | 25 | 0.1 - 5 |