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UID:0-329@aerospace.technion.ac.il

DTSTART;TZID=Asia/Jerusalem:20190130T163000

DTEND;TZID=Asia/Jerusalem:20190130T173000

DTSTAMP:20230527T132438Z

URL:https://aerospace.technion.ac.il/events/combustion-of-boron-based-pyro
 technic-compounds/

SUMMARY:Combustion of Boron Based Pyrotechnic Compounds
DESCRIPTION:Lecturer:Yair Solomon\n Faculty:Department of Aerospace Enginee
 ring\n Institute:Technion – Israel Institute of Technology\n Location:Cl
 assroom 165\, ground floor\, Library\, Aerospace Eng.\n Zoom: \n Abstract:
  \n Details: \n Boron based gelled fuels are promising candidates for cert
 ain future ramjet applications\, offering potential improvements in perfor
 mance and/or safety over conventional liquid and solid systems. For this p
 urpose\, a fundamental understanding of combustion of gel droplets is requ
 ired and several problems of ignition and agglomeration of boron particles
  have to be solved.\nThis study addresses the combustion behavior of micro
 -pyrotechnic clusters of boron suspended in kerosene based gel fuels. The 
 pyrotechnic clusters should ignite in the temperature range between the en
 d of the kerosene evaporation and the liquefaction of boron oxide. This te
 mperature range defines a “dry window” where the boron particles are n
 ot submerged in any liquid and their dispersion is not limited by the liqu
 id viscosity and surface tension. Operation within this time frame allows 
 the pyrotechnic reaction to heat up and disperse the boron particles.\nThe
  research combines both experimental and theoretical investigations on gel
  combustion. In the experimental part\, pyrotechnic clusters with differen
 t oxidizers were tested in order to identify and understand the various ig
 nition and combustion phenomena of gel fuels. In addition to the combustio
 n tests of gel droplets\, calorimetric tests of the pyrotechnic mixture we
 re conducted. The theoretical part aims to determine the temperature and p
 ressure profiles inside the burning gel droplet. This allows determining t
 he existence of temperature gradients inside the droplet that produce a 
 “dry window” during the droplet combustion. The existence of a pressur
 e gradient over the droplet outer layer may explain various phenomena\, su
 ch as secondary atomization\, that can break up the droplet into smaller p
 arts and improve combustion efficiency.
CATEGORIES:Seminars
LOCATION:Classroom 165\, ground floor\, Library\, Aerospace Eng.

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