Jomaas, Grunde1; Torero, Jose L.14; Eigenbrod, Christian4; Niehaus, Justin15; Olson, Sandra L.15; Ferkul, Paul V.6; Legros, Guillaume7; Fernandez-Pello, A. Carlos16; Cowlard, Adam J.17; Rouvreau, Sebastien10; Smirnov, Nickolay11; Fujita, Osamu18; T'ien, James S.19; Ruff, Gary A.15; Urban, David L.15
1 Department of Civil Engineering, Technical University of Denmark2 Section for Building Design, Department of Civil Engineering, Technical University of Denmark3 University of Queensland4 University of Bremen5 NASA Glenn Research Center6 Universities Space Research Association7 Université Pierre et Marie Curie8 University of California at Berkeley9 University of Edinburgh10 Belisama R&D11 Moscow Lomonosov State University12 Hokkaido University13 Case Western Reserve University14 University of Queensland15 NASA Glenn Research Center16 University of California at Berkeley17 University of Edinburgh18 Hokkaido University19 Case Western Reserve University
Beyond flammability testing of small samples
An international research team has been assembled to reduce the uncertainty and risk in the design of spacecraft fire safety systems by testing material samples in a series of flight experiments (Saffire 1, 2, and-3) to be conducted in an Orbital Science Corporation Cygnus vehicle after it has undocked from the International Space Station (ISS). The tests will be fully automated with the data downlinked at the conclusion of the test before the Cygnus vehicle re-enters the atmosphere. The unmanned, pressurized environment in the Saffire experiments allows for the largest sample sizes ever to be tested for material flammability in microgravity, which will be based on the characteristics of flame spread over the surface of the combustible material. Furthermore, the experiments will have a duration that is unmatched in scale compared to earth based microgravity research facilities such as drop towers (about 5 s) and parabolic flights (about 20 s). In contrast to sounding rockets, the experiments offer a much larger volume, and the reduction in the oxygen concentration during the Saffire experiments will be minimal. The selection of the experimental settings for the first three Saffire experiments has been based on existing knowledge of scenarios that are relevant, yet challenging, for a spacecraft environment. Given that there is always airflow in the space station, all the experiments are conducted with flame spread in either concurrent or opposed flow, though with the flow being stopped in some tests, to simulate the alarm mode environment in the ISS and thereby also to study extinguishment. The materials have been selected based on their known performance in NASA STD-6001Test-1, and with different materials being classified as charring, thermally thin, and thermally thick. Furthermore, materials with non-uniform surfaces will be investigated.
Acta Astronautica, 2015, Vol 109, p. 208-216
Experiments; Fire safety; Flame propagation; Flammability; Microgravity