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2 Investigations
BASS — Burning and Suppression of Solids
Microgravity (0 g)
View Test Conditions & Measured Variables
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
[ 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.