Megahertz Rate Optical Diagnostics of Explosively Generated Soot

Wan, Kevin; Webb, Austin M.; Saltzman, Ashley J.; Travis, Rebekah L.; Manin, Julien; Pickett, Lyle M.; Egeln, Anthony A.; Voskuilen, Tyler G.; Arienti, Marco; Houim, Ryan W.; Meyer, Terrence R.; Guildenbecher, Daniel R.

doi:10.1002/prep.70019

Megahertz Rate Optical Diagnostics of Explosively Generated Soot

Journal Article · Mon Jul 21 00:00:00 EDT 2025 · Propellants, Explosives, Pyrotechnics

DOI:https://doi.org/10.1002/prep.70019· OSTI ID:2583710

Wan, Kevin ^[1]; Webb, Austin M. ^[2]; Saltzman, Ashley J. ^[3]; Travis, Rebekah L. ^[2]; Manin, Julien ^[1]; Pickett, Lyle M. ^[1]; Egeln, Anthony A. ^[4]; Voskuilen, Tyler G. ^[3]; Arienti, Marco ^[1]; Houim, Ryan W. ^[4]; Meyer, Terrence R. ^[2]; Guildenbecher, Daniel R. ^[5]

Sandia National Laboratories (SNL-CA), Livermore, CA (United States)
Purdue Univ., West Lafayette, IN (United States)
Sandia National Laboratories (SNL-NM), Albuquerque, NM (United States)
Univ. of Florida, Gainesville, FL (United States)
Purdue Univ., West Lafayette, IN (United States); Sandia National Laboratories (SNL-NM), Albuquerque, NM (United States)

Detonation of a solid explosive produces a turbulent and luminous post‐detonation fireball containing condensed carbon soot. Diagnostics of soot dynamics are needed for model validation and to interpret emission signals. Diffuse back‐illumination extinction imaging (DBI‐EI) and laser‐induced incandescence (LII) are two common optical diagnostics for flame soot. This work extends both to measure time‐resolved soot dynamics from a 12 mm HMX hemisphere. DBI‐EI measured line‐of‐sight optical extinction exceeds 99% in some regions. Results are tomographically inverted to obtain a signal proportional to the soot volume fraction. Pulse‐burst LII measures are presented at 1 MHz. For the first time, LII results are combined with DBI‐EI extinction measurements to quantify and correct for signal trapping. Following this, spatially and temporally resolved DBI‐EI and LII measures are shown to be in reasonable agreement. Finally, experimental results are compared against recently developed simulations. Quantitative differences in the soot mixing dynamics are resolved. These findings motivate future model improvements and demonstrate ongoing needs for diagnostic advancements for heavily sooting environments.

View Accepted Manuscript (DOE)

Research Organization:: Sandia National Laboratories (SNL-CA), Livermore, CA (United States); Sandia National Laboratories (SNL-NM), Albuquerque, NM (United States)

Sponsoring Organization:: USDOE National Nuclear Security Administration (NNSA); USDOE Laboratory Directed Research and Development (LDRD) Program

Grant/Contract Number:: NA0003525

OSTI ID:: 2583710

Journal Information:: Propellants, Explosives, Pyrotechnics, Journal Name: Propellants, Explosives, Pyrotechnics Journal Issue: 9 Vol. 50; ISSN 1521-4087; ISSN 0721-3115

Publisher:: WileyCopyright Statement

Country of Publication:: United States

Language:: English

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