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Ignition of flare propellants using AL/NI-Nanofoils at sub-atmospheric pressure

: Weiser, Volker; Roth, Evelin; Knapp, Sebastian; Lity, A.

Volltext urn:nbn:de:0011-n-5647831 (488 KByte PDF)
MD5 Fingerprint: 6cb82b0574b901f04c3f2d58e5bc2239
Erstellt am: 9.11.2019

Fraunhofer-Institut für Chemische Technologie -ICT-, Pfinztal:
Energetic materials. Past, present and future : 50th International Annual Conference of the Fraunhofer ICT, June 25-28, 2019, Convention Center, Karlsruhe, Germany
Pfinztal: Fraunhofer ICT, 2019
11 S.
Fraunhofer-Institut für Chemische Technologie (International Annual Conference) <50, 2019, Karlsruhe>
Konferenzbeitrag, Elektronische Publikation
Fraunhofer ICT ()

A fast and safe ignition is substantial for an effective application of decoy flares also under sub-atmospheric pressure conditions. This study investigates the use of Al/Ni-nanofoils as liners to ignite a flare pyrolant under pressure conditions up to an altitude of 10 km. The reaction front of the nanofoil propagates with more than 8 m/s and release temperatures close to 2000 K both independent of ambient pressure. Successful ignition was demonstrated down to 30 kPa with ignition delay times ranging from 100 ms (100 kPa) to 380 ms (30 kPa). To reduce the ignition delay, a modified fixation is proposed to avoid deformation of the nanofoil during reaction and to improve the heat transfer.