![\"Rubins,](\"https:\/\/www.nasa.gov\/wp-content\/uploads\/2021\/04\/17_flameon_iss064e029405_alt.jpg?w=600\")
<\/figure>The Combustion Integrated Rack <\/strong>(CIR), developed and operated by NASA\u2019s Glenn Research Center<\/strong><\/a>, provides a secure and safe environment for a wide range of combustion experiments. Different chamber inserts that enable a variety of investigations include the Multi-user Droplet Combustion Apparatus, which supported FLame Extinguishment Experiments (FLEX), the Advanced Combustion via Microgravity Experiments (ACME) insert, and the Solid Fuel Ignition and Extinction \u2013 Growth and Extinction Limit (SoFIE) chamber.<\/p>\n FLEX<\/strong>, which analyzed the effectiveness of fire suppressants, led to the discovery<\/strong><\/a> of a type of cool flame, where the fuel continued \u201cburning\u201d under certain conditions after extinction of the visible flame. Typical flames produce carbon dioxide and water, but cool flames produce carbon monoxide and formaldehyde. Learning more about the behavior of these chemically different flames could lead to the development of more-efficient, less-polluting vehicles. Cool flames produced on Earth quickly flicker out. Since they burn longer in microgravity, scientists have the opportunity to study them.<\/p>\n FLEX-2<\/strong> looked at how quickly fuel droplets burn, the conditions required for soot to form, and how mixtures of liquid fuels evaporate before burning. Results could help make future spacecraft safer and increase fuel efficiency for engines using liquid fuel on Earth.<\/p>\n ACME<\/strong> is a set of six independent studies using the CIR to examine fuel efficiency and pollutant production in combustion on Earth. The series also looked at improving spacecraft fire prevention through a better understanding of materials flammability.<\/p>\n One ACME investigation, Flame Design<\/strong>, studied the quantity of soot produced under different flame conditions. Soot, the carbon residue left when carbon-containing material does not fully burn, causes environmental and health issues but is desirable for some purposes. Results could enable the design of flames with more or less soot, depending on the specific need, and may help create more efficient and less polluting designs for burning fuel.<\/p>\n ACME\u2019s Burning Rate Emulator (BRE<\/strong>) simulated the flammability of solid and liquid materials by burning gaseous fuels under specific conditions. Analysis of 59 BRE burn tests provided data on heat flow, flame size, effects of fuel mixture flow, and other important parameters.1<\/sup> Results could improve the fundamental understanding of materials flammability and assess whether existing methods for testing flammability are effective in microgravity.<\/p>\n Burning and Suppression of Solids (BASS<\/strong>) was one of the first investigations to examine how to extinguish fuels burning in microgravity. Putting out fires in space must consider flame geometry, characteristics of the materials, and methods used to extinguish it, because methods used on the ground could be ineffective or even make the flame worse.<\/p>\n BASS-II<\/strong> examined the characteristics of a variety of fuel samples to see whether materials burn as well in microgravity as in normal gravity, given the right conditions. Several papers have reported results from BASS-II, with findings including the differences between flame spread and fuel regression and comparison of flame spread rates.2,3<\/sup><\/p>\n SoFIE-GEL<\/strong> analyzes how the temperature of a fuel affects material flammability. Researchers report that experiment observations agree with trends predicted by the models. This investigation, the first in a series, tested various fuels including flat sheets, thick slabs, cylinders, and spheres.<\/p>\n Saffire <\/strong>is a series of experiments conducted aboard uncrewed Cygnus cargo spacecraft after they depart the station, which makes it possible to test larger fires without putting crew members at risk. Results on flame spread in microgravity can be used to establish the rate of heat release in a spacecraft4<\/sup> and show that reducing pressure slows down that spread.5<\/sup><\/p>\n Confined Combustion<\/strong>, sponsored by the ISS National Lab, examines flame spread in confined spaces of different shapes. Confinement affects fire characteristics and hazards. Researchers report specifics on interactions between a flame and its surrounding walls and the fate of the flame, such as growth or extinction.6<\/sup> These results provide guidance for the design of structures, fire safety codes, and response in space and on Earth. Other results suggest that confinement can increase or decrease solid fuel flammability depending on conditions.7<\/sup><\/p>\n FLARE<\/strong>, an investigation sponsored by JAXA (Japan Aerospace Exploration Agency), also tests the flammability of materials in microgravity. Results could significantly improve fire safety on future missions.<\/p>\n Flame studies help keep crews in space safe. This research also could lead to more efficient combustion that reduces pollutants and produces more efficient flames for uses on Earth such as heating and transportation.<\/p>\n Search <\/a>this database<\/a> of scientific experiments to learn more about those mentioned above.<\/p>\n<\/p>\n![\"A](\"https:\/\/www.nasa.gov\/wp-content\/uploads\/2019\/09\/iss040e023287medium.jpg?w=1280\")
<\/figure>![\"Astronaut](\"https:\/\/www.nasa.gov\/wp-content\/uploads\/2023\/03\/iss067e367893.jpg?w=1041\")
<\/figure>![\"A](\"https:\/\/www.nasa.gov\/wp-content\/uploads\/2023\/12\/jsc2023e046375medium.jpg?w=1280\")
<\/figure>![\"male](\"https:\/\/www.nasa.gov\/wp-content\/uploads\/2023\/09\/iss069e092040-satoshi-furukawa-flare.jpg?w=2048\")
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