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20 Investigations
ACME BRE — Advanced Combustion via Microgravity Experiments - Burning Rate Emulator
Microgravity (0 g)
View Test Conditions & Measured Variables
Held constant: none
Varied: Burner Size (mm); Fuel Bottle; Oxygen Conc (percent)
Measured: Flames Ignited
Imaging settings: Date; Notes
ACME CFI-G — Advanced Combustion via Microgravity Experiments / Cool Flames Investigation with Gases
Microgravity (0 g)
View Test Conditions & Measured Variables
Held constant: none
Varied: Flame Type; approx p (bar); Fuel; O2 flow rate (mg/s); Xf before test; XO2; +3 more
Measured: burn time (sec); Color; HC burnrate (mg/s); Hot ignition; Peak burner Temp (C); Peak burner temp (K); +9 more
Imaging settings: Comments
ACME CLD Flame — Advanced Combustion via Microgravity Experiments / Coflow Laminar Diffusion Flame
Microgravity (0 g)
View Test Conditions & Measured Variables
Held constant: none
Varied: Fuel Bottle; Fuel conc. Range; Fuel MFC; N2 MFC
Measured: Flames ignited
Imaging settings: Notes
ACME E-FIELD Flames — Advanced Combustion via Microgravity Experiments Electric-Field Effects on Laminar Diffusion Flames
Microgravity (0 g)
View Test Conditions & Measured Variables
Held constant: none
Varied: Fuel Bottle; Fuel Conc; Mesh Polarity
Measured: Flames Ignited
Imaging settings: Date; Notes
ACME/Flame Design — Advanced Combustion via Microgravity Experiments / Flame Design
Microgravity (0 g)
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Held constant: none
Varied: Flame Type; mN2 (mg/s); mO2 (mg/s); mtot (mg/s); pfinal (atm); pinit (atm); +7 more
Measured: mean Zst; Tad (K); XC2H4 final; XO2 (final)
BASS — Burning and Suppression of Solids
Microgravity (0 g)
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Held constant: Extinguish ?; Restricter
Varied: CO2, mm Hg; Flow restrictor; pressure, atm; GN2 Pot; material; O2 % by volume; +8 more
Measured: Test Observations and Anomalies (ignited, spread, extinguished, burn time, color, etc.)
Imaging settings: Actual Date (for SPICE Display Date, add 1 for Leap Year); Air display; Approx Start Time ( with GMT); Bracket frames and exposure bracket (#F/ 1.0); Date on videos and images; Exposure compensation (-#EV); +26 more
BASS-II — Burning and Suppression of Solids - II
Microgravity (0 g)
View Test Conditions & Measured Variables
Held constant: none
Varied: Flow restrictor; Calibrated initial O2 % by vol; Fuel Sample Material; Initial CO2 % by vol; Initial CO (ppm); Material
Measured: Calibrated final O2 % by vol; Final CO2 % by vol; Final CO (ppm)
Imaging settings: Air display; Date; Fan display; GMT; Radiometer gain (1000 250 50 10); Total Frames Shot; +4 more
CFI — Cool Flames Investigation
Microgravity (0 g)
View Test Conditions & Measured Variables
Held constant: none
Varied: Fiber; Fuel; Helium; Nitrogen; Oxygen; Pressure; +4 more
Measured: 2.5mm CF; 2.5mm narrow; 2.5mm rad; 2.5mm time; Actual D; CF Rad Ratio; +10 more
Imaging settings: Local Time; Test Date; CF Gain; Downlink Video; HF Gain; HIBMS; +5 more
CFI-Counterflow — Quantitative Studies of Cool Flame Transitions at Radiation / Stretch Extinction Using Counterflow Flames
Microgravity (0 g)
Ground / simulation study; PSI holds only a data index of publication figures (8 rows), no per-test rows.
DAFT / DAFT-2 — Dust and Aerosol Measurement Feasibility Test / Dust and Aerosol Measurement Feasibility Test-2
Microgravity (0 g)
View Test Conditions & Measured Variables
Held constant: Sample Material
Varied: none
Measured: none
Imaging settings: Actual Day
FLEX — Flame Extinguishment Experiment
Microgravity (0 g)
View Test Conditions & Measured Variables
Held constant: none
Varied: Ambient pressure; mmHg; CO initial ambient composition; mole fraction; Droplet initial diameter; mm; Fuel; He initial ambient composition; mole fraction; N initial ambient composition; mole fraction; +1 more
Measured: Burn time; s; Burning rate; mm; Test end; Visible flame extinction diameter; mm
Imaging settings: Test Date; Test GMT
FLEX-2 — Flame Extinguishment Experiment - 2
Microgravity (0 g)
View Test Conditions & Measured Variables
Held constant: Ambient Gas Mixture; Ambient Pressure (atm); Ambient Temperature (C); Flow Velocity (cm/s); Initial Droplet Diameter (mm); Oxygen Mole Fraction
Varied: Sample (Fuel Type)
Measured: none
SAFFIRE-I — Spacecraft Fire Safety Experiment-I
Microgravity (0 g)
View Test Conditions & Measured Variables
Held constant: Air Flow (cm/s); Ignition Power (W); Ignition Time (s); Sample Length (cm); Sample Thickness (cm); Sample Width (cm)
Varied: Flow Direction; Material; Percent O2
Measured: Burn Time (s)
Imaging settings: Camera 1; Camera 2
SAFFIRE-II — Spacecraft Fire Experiment-II
Microgravity (0 g)
View Test Conditions & Measured Variables
Held constant: Air Flow (cm/s); Sample Width (cm)
Varied: Flow Direction; Ignition Power (W); Ignition Time (s); Material; Percent O2 (Note 1); Samle Thickness; +1 more
Measured: 1-g Burn Length; 1-g Spread Rate; Burn Time (s); ?-g Burn Length; ?-g Spread Length
Imaging settings: Camera 1; Camera 2
SAFFIRE-III — Spacecraft Fire Experiment-III
Microgravity (0 g)
View Test Conditions & Measured Variables
Held constant: Air Flow; Material; Sample Length; Sample Thickness; Sample Width
Varied: Direction
Measured: none
Imaging settings: Camera 1; Camera 2
SAME — Smoke and Aerosol Measurement Experiment
Microgravity (0 g)
View Test Conditions & Measured Variables
Held constant: none
Varied: Aging Duration (minutes); Air Flow (cm/s); Sample Material
Measured: Weight loss rate (mg/min)
SAME-R — Smoke Aerosol Measurement Experiment-Reflight
Microgravity (0 g)
View Test Conditions & Measured Variables
Held constant: Primary mixing time (sec)
Varied: Duration (sec); Inlet velocity (cm/s); Net aging time (sec); Primary aging time (sec); Sample Type
Measured: Rt/R0
Imaging settings: Date
SAME-Sim — Utilization of the Smoke Aerosol Measurement Experiment Data for Advanced Modeling and Simulation of Smoke Generation in Micro-Gravity
Microgravity (0 g)
Numerical simulation of smoke growth (0 g vs 1 g); no experimental table in PSI.
SPICE — Smoke Point In Co-flow Experiment
Microgravity (0 g)
View Test Conditions & Measured Variables
Held constant: none
Varied: Air Rate (cm/s); Fuel; Fuel Rate (mg/s); Fuel Rate (sccm); HC Fuel Rate (mg/s); Nozzle (mm)
Measured: none
Imaging settings: GMT date; GMT Flame Off; GMT ignition
SPICE-Model — Computational and Experimental Analysis of SPICE Data Sets
Microgravity (0 g)
Ground analysis of SPICE images; no experimental table in PSI.
[ SCIENCE CONTEXT // FROM THE PSI INVESTIGATION RECORDS ]
Hardware mapping (from each PSI investigation record)
CIR + ACME
Combustion Integrated Rack with the ACME gaseous-flame experiment
Gaseous fuels: spherical / coflow / burner flames (Flame Design, BRE, CLD, E-FIELD, CFI-G).
CIR + MDCA
Multi-user Droplet Combustion Apparatus inside the CIR
Liquid fuel droplets with O2 / CO2 / He dilution (CFI, FLEX-2, FLEX).
MSG flow tunnel / duct
Microgravity Science Glovebox
BASS-II record: wind tunnel installed in the MSG; SPICE record: flow duct with integrated nozzles. SAME / SAME-R (PSI-101, PSI-102) also ran in the Glovebox with the Comparative Soot Diagnostic hardware. SLICE appears only as attached engineering documents in the PSI-26 / PSI-107 file lists, not as an investigation.
Cygnus enclosure
Saffire enclosure on the Cygnus vehicle
Large solid samples (SIBAL cotton-fiberglass and others) burned after Cygnus left the ISS.
Gravity Coverage Ladder
Real NASA test runs available at each gravity level, from microgravity to Earth.
0 g Microgravity
Measured in flight or on the ground
2,051 test runs across 17 investigations (ISS and Cygnus flights)
PSI-25,PSI-26,PSI-98,PSI-99,PSI-100,PSI-10,PSI-20,PSI-21,PSI-22,PSI-107,PSI-159,PSI-39,PSI-68,PSI-69,PSI-47,PSI-101,PSI-102
0.16 g Lunar
Measured in flight or on the ground
No test runs recorded at 0.16 g.
Estimated from airflow
77 microgravity runs with airflow comparable to ~0.16 g buoyancy, across 1 investigation
0.38 g Mars
Measured in flight or on the ground
No test runs recorded at 0.38 g.
Estimated from airflow
65 microgravity runs with airflow comparable to ~0.38 g buoyancy, across 3 investigations
Cross-investigation connections (per PSI records)
DAFT qualified the SAME smoke counter
DAFT / DAFT-2 was run to mitigate risk for SAME: a TSI P-Trak modified for microgravity (capillary alcohol recycling) was compared with a DustTrak using Arizona Red Dust as the aerosol standard. SAME / SAME-R then relied on that P-Trak to count smoke aerosols.
BRE: gaseous fuels standing in for solids in still air
ACME BRE burns CH4/N2 and C2H4/N2 on 25 and 50 mm porous burners to establish burning conditions in a quiescent microgravity ambient in terms of condensed-fuel material properties; the record lists the 14.7 psia / 21 %, 10.2 psia / 26.5 % and 8.2 psia / 34 % O2 habitat atmospheres as planned test atmospheres.
CFI-G: inside-out (inverse) spherical flames, high O2
Normal and inverse spherical diffusion flames of propane, butane and ethane blends. The CFI-G table lists XO2 from 0.12 to 0.85 (O2 mole fraction XO2, mol/mol, dimensionless: standard combustion-symbol convention, user-confirmed and not stated in the PSI file; 0.85 matches the 85 % O2 in the investigation text).
E-FIELD: electric field isolated from buoyancy
Up to 10 kV between burner and mesh; ion current and flame response are measured. Whether the ionic body force can emulate partial gravity is a research hypothesis, not a result in the ingested PSI files. No lunar-gravity (LUCI / FM2) data are present in the ingested files.
0 g and 1 g bound intermediate gravity (concept only)
BASS-II tests whether materials burn as well in microgravity with adequate ventilation as in normal gravity, bridging NASA-STD-6001 Test #1 (1 g) and microgravity. The PSI tables hold 0 g rows only (inferred from flight metadata); there are no 0.16 g, 0.38 g or 1 g rows.