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UID:0-1178@aerospace.technion.ac.il

DTSTART;TZID=Asia/Jerusalem:20250917T133000

DTEND;TZID=Asia/Jerusalem:20250917T143000

DTSTAMP:20250827T093714Z

URL:https://aerospace.technion.ac.il/events/experimental-investigation-of-
 burning-rate-of-solid-propellants-with-expandable-graphite-additives-at-hi
 gh-pressures/

SUMMARY:Experimental Investigation of Burning Rate of Solid Propellants wit
 h Expandable Graphite Additives at High Pressures
DESCRIPTION:Lecturer:Noa Hanina \n Faculty:The Stephen B. Klein Faculty of 
 Aerospace Engineering at the Technion \n Institute:Technion – Israel Ins
 titute of Technology\n Location:Classroom 165\, ground floor\, Library\, A
 erospace Eng.\n Zoom: https://technion.zoom.us/j/93549691766\n Abstract: \
 n\n\nThis study examines the enhancement of composite solid propellant bur
 ning rates by the addition of expandable graphite (EG)\, focusing on high-
 pressure combustion conditions typical of rocket motors. The burning rate 
 of solid propellants is characteristic to the propellant formulation and i
 t increases with pressure. Expandable graphite\, a form of graphite interc
 alated with guest molecules\, expands and elongates into worm-like structu
 res when heated above approximately 200°C. When incorporated into the pro
 pellant matrix\, the elongate EG strings can protrude from the burning sur
 face conducting heat from the hot combustion gases into the unburned mater
 ial. This enhanced heat feedback accelerates the propellant decomposition 
 process\, leading to a higher burning rate.\nExperiments were conducted us
 ing a high-pressure\, windowed strand-burner test cell on ammonium perchlo
 rate (AP)-based propellants with hydroxyl-terminated polybutadiene (HTPB) 
 or polyester binders. Propellant strands were tested with various EG types
  differing in flake size (100–350 µm) and expansion onset temperature (
 150–240°C)\, at mass fractions ranging from 0 to 5%\, with a constant A
 P content of 75%. Results showed that EG had a more pronounced effect on A
 P-HTPB formulations\, achieving up to 35% increase in burning rate at high
  pressures\, while AP-polyester compositions exhibited a less significant 
 response. In general\, higher EG content led to greater enhancement. These
  findings demonstrate that EG is an effective additive for improving burni
 ng rates by enhancing internal heat conduction\, offering a promising appr
 oach to optimize the performance of solid propellants in high-pressure app
 lications.\n\n\n\n Details: \n 
CATEGORIES:Seminars,סמינרים
LOCATION:Classroom 165\, ground floor\, Library\, Aerospace Eng.

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