mercredi 23 novembre 2016

NASA Sets Space Fire in Second Round of Fire Safety Experiments












NASA - Saffire Mission patch.

Nov. 23, 2016

Fire safety is a crucial component of space living. As we partner with industry and international space agencies to develop deep space habitation capabilities, we are leveraging every opportunity to validate important habitation-related systems and operations in low-Earth orbit. The second Spacecraft Fire Safety experiment, or Saffire-II, is a fire experiment with nine material swatches that will be ignited in a cargo ship as it orbits Earth. Saffire-II is the second in a series of three fire safety experiments, and builds on the data captured during Saffire-I with an expanded test portfolio of new materials.

Cygnus Spacecraft Departs ISS (archive image). Image Credit: NASA

Saffire-II launched on OA-5 in October 2016. The nine samples in the experiment kit aboard the Cygnus cargo vehicle include a cotton-fiberglass blend, Nomex, and the same acrylic glass that is used for spacecraft windows. After the spacecraft departs the station, and before its destructive reentry to Earth, mission controllers on the ground will remotely ignite the samples.

Saffire-II mission updates will be added below as data and imagery are returned from the orbiting Cygnus vehicle.

Tuesday, Nov. 22, 2106

6:00 p.m: The Saffire team has successfully downlinked images from the nine samples tested in Saffire-II. The first sample has a thin sheet of poly(methyl methacrylate) (PMMA), also known as plexiglass, that is being used to ignite Nomex, a commercially available, flame-resistant material that is used on spacecraft for cargo storage bags and as a fire barrier. The second sample is a plexiglass sheet (5 cm wide x 29 cm long x 10 cm wide), a material that is used for spacecraft windows. The Saffire investigators will continue to downlink data and images on Tuesday and Wednesday nights and provide additional updates as they are available.

video
Saffire-II Sample 7

Monday, Nov. 21, 2016

9:30 p.m.: All nine samples have burned and preliminary telemetry indicate that data and images were recorded as expected for all 9 samples and flow visualization. The Saffire-II hardware performed very well and there were no issues. The team will spend tonight downlinking the sensor and image data and begin analysis of the dataset tomorrow morning. Updates on Tuesday will include preliminary sensor data and images from the burns.

video
Saffire-II Sample 9

8:04 p.m.: Samples 1-6 have been ignited and we’ve captured more than 106,000 images. Samples 1-4 were a silicon material at different thicknesses. Samples 5 and 6 were the same cotton-fiberglass blend that was burned on Saffire-I; one was at the same flow speed as Saffire-I and the other was at the flow speed planned for Saffire-III. Samples 7-9 up next! The images will be downlinked to Orbital ATK overnight and transferred to researchers at NASA-GRC for analysis tomorrow. Initial images will be released as they are available.

7:14 p.m.: We've received confirmation that the first Saffire-II test sample has been ignited.

6:04 p.m.: Orbital ATK has confirmed that the Saffire-II experiment is powered and we are receiving telemetry. We remain on track for a 7:00 p.m. sample ignition.

8:22 a.m.: Shane Kimbrough of NASA and Thomas Pesquet of the European Space Agency commanded the International Space Station’s Candadarm2 robotic arm to release the Cygnus spacecraft.

Related articles:

Cygnus Spacecraft Departs ISS
http://orbiterchspacenews.blogspot.ch/2016/11/cygnus-spacecraft-departs-iss.html

ISS - BEAM Update: Expandable Habitat Reveals Important Early Performance Data
http://orbiterchspacenews.blogspot.ch/2016/11/iss-beam-update-expandable-habitat.html

Related links:

Saffire home page: https://www.nasa.gov/saffire

Glenn Research Center: https://www.nasa.gov/centers/glenn/home/index.html

Journey to Mars: https://www.nasa.gov/topics/journeytomars/index.html

Space Station Research and Technology: https://www.nasa.gov/mission_pages/station/research/index.html

International Space Station (ISS):  https://www.nasa.gov/mission_pages/station/main/index.html

Image (mentioned), Videos, Text, Credits: NASA/Erin Mahoney.

Best regards, Orbiter.ch

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