Thermal and physical structures of high explosive fireballs through optical thermometry and high-speed imaging
Brunkow, Samuel Neal
Loading…
Permalink
https://hdl.handle.net/2142/124425
Description
Title
Thermal and physical structures of high explosive fireballs through optical thermometry and high-speed imaging
Author(s)
Brunkow, Samuel Neal
Issue Date
2024-05-01
Director of Research (if dissertation) or Advisor (if thesis)
Glumac, Nick G
Department of Study
Mechanical Sci & Engineering
Discipline
Mechanical Engineering
Degree Granting Institution
University of Illinois at Urbana-Champaign
Degree Name
M.S.
Degree Level
Thesis
Keyword(s)
Fireball
Pyrometry
Spectroscopy
Imaging
High Explosive
Secondary Explosive
Structure
Language
eng
Abstract
Secondary high explosives including Composition A-5, PBXN-5, TNT, Composition B, PETN, and one metalized explosive, RDX-AL, were tested to characterize detonation fireball physical and thermal structures. Hemispherical 25-gram charges were detonated on a transparent PMMA sheet enabling optical measurements with a basal view of the fireball’s internal structure. Temperature profiles were determined through pyrometry and blackbody fitting of binned imaging spectra. The 3-color pyrometry was employed at three radial distances from the detonation center with sub microsecond temporal resolution utilizing optical fiber installed flush with the transparent sheet for light capture at 700, 900, and 1300 nm. Imaging spectra, captured at a flame front radius of approximately 3 to 4.5 inches, facilitated measurement of the thermal distribution across the flame front. Additionally, an HFSC Pro framing camera was utilized to capture the fireball directly on and as viewed from underneath. The high-speed imaging facilitated spatial characterization of the internal fireball structure at 4 diameters and qualitative assessments of hydrodynamic instabilities and relative turbulent mixing. Measurements and observations are compared with current literature and state-of-the-art theoretical models.
Use this login method if you
don't
have an
@illinois.edu
email address.
(Oops, I do have one)
IDEALS migrated to a new platform on June 23, 2022. If you created
your account prior to this date, you will have to reset your password
using the forgot-password link below.
