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UID:0-283@aerospace.technion.ac.il

DTSTART;TZID=Asia/Jerusalem:20201125T163000

DTEND;TZID=Asia/Jerusalem:20201125T173000

DTSTAMP:20230525T070853Z

URL:https://aerospace.technion.ac.il/events/agglomeration-in-composite-pro
 pellants-containing-different-nano-aluminum-powders/

SUMMARY:Agglomeration in Composite Propellants containing Different Nano-Al
 uminum Powders
DESCRIPTION:Lecturer:Ortal Cohen\n Faculty:Department of Aerospace Engineer
 ing\n Institute:Technion – Israel Institute of Technology\n Location:htt
 ps://technion.zoom.us/j/91226230537\n Zoom: \n Abstract: \n Details: \n Mi
 cron-sized aluminum powder is added to solid propellants in order to incre
 ase their performance and to suppress combustion instabilities. During the
  combustion\, aluminum particles accumulate and form agglomerates. Agglome
 ration may cause loss of potential chemical energy due to incomplete combu
 stion\, two-phase flow losses\, and accumulation of slag in the motor. A w
 ell-known method to reduce agglomeration is the use of nano-aluminum powde
 rs (such as ALEX). The specific surface of nano-powders is larger than tha
 t of micron‑sized powders\, therefore their reaction and heating rates a
 re higher. The nano-aluminum particle ignites faster with shorter burning 
 time\, resulting in a higher burning rate.\nIn order to further improve th
 e performance\, different materials were investigated for coating nano-alu
 minum particles. Two of the powders considered are V-ALEX\, a fluoropolyme
 r (Viton) coated nano-aluminum\; and L-ALEX\, stearic acid coated nano-alu
 minum. A thin layer of coating may promote particle ignition\, which decre
 ases the agglomerate size and\, thus\, reduces the two-phase flow losses.\
 nThe purpose of the research is to examine the effect of ALEX\, V-ALEX and
  L‑ALEX powders on the agglomeration phenomenon in solid AP/HTPB propell
 ants\, at different operating pressures. The agglomeration phenomenon was 
 measured by high speed video photography in order to record the combustion
  process of propellant strands. The strands were burned inside a windowed 
 pressure chamber\, allowing measurements of the agglomerates size and numb
 er. The experimental data show that coated nano-powders exhibit reduced ag
 glomeration\, in terms of number of agglomerates and their volume\, and th
 at propellants containing V-ALEX powder experienced the largest decrease i
 n agglomeration.\nZoom Meeting
CATEGORIES:Seminars
LOCATION:https://technion.zoom.us/j/91226230537

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