Chapman–Jouguet deflagration criteria and compressibility dynamics of turbulent fast flames for turbulence-induced deflagration-to-detonation transition

Chin, Hardeo; Chambers, Jessica; Poludnenko, Alexei; Gamezo, Vadim N.; Ahmed, Kareem A.

doi:10.1063/5.0144662

Chapman–Jouguet deflagration criteria and compressibility dynamics of turbulent fast flames for turbulence-induced deflagration-to-detonation transition

Journal Article · Thu Jun 15 00:00:00 EDT 2023 · Physics of Fluids

DOI:https://doi.org/10.1063/5.0144662· OSTI ID:1992575

^[1]; Chambers, Jessica ^[2]; ^[3]; Gamezo, Vadim N. ^[4]; ^[2]

Univ. of Central Florida, Orlando, FL (United States). Propulsion and Energy Research Laboratory, Center for Advanced Turbomachinery & Energy Research; Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)
Univ. of Central Florida, Orlando, FL (United States). Propulsion and Energy Research Laboratory, Center for Advanced Turbomachinery & Energy Research
Univ. of Connecticut, Storrs, CT (United States)
Naval Research Lab. (NRL), Washington, DC (United States)

This work characterizes the compressibility dynamics in turbulent fast flames for a range of turbulent flame speeds. These turbulent fast flames experience increased effects of compressibility through the formation of strong shocks and may develop a runaway acceleration combined with a pressure buildup that leads to turbulence induced deflagration-to-detonation transition (tDDT). Simultaneous high-speed particle image velocimetry, OH* chemiluminescence, schlieren, and pressure measurements are used to examine the reacting flow field and flame dynamics. We examine flames with turbulent flame speeds ranging from 100 to 600 m/s. At lower turbulent flame speeds, the flame is not able to produce favorable background conditions for deflagration-to-detonation transition (DDT) onset, and thus flame compressibility and turbulence amplification are less dominant, resulting in a weaker acoustic coupling between the flame and compressed region. As the turbulent burning velocities exceed the Chapman–Jouguet deflagration speed, favorable background conditions are produced, as we observe flame-generated shocks and flame-generated turbulence with higher turbulent velocities and larger turbulent scales. At this regime, the flame is categorized to be at the runaway transition regime that leads to tDDT.

View Accepted Manuscript (DOE)

Research Organization:: Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)

Sponsoring Organization:: USDOE National Nuclear Security Administration (NNSA); National Science Foundation (NSF); Air Force Office of Scientific Research (AFOSR)

Grant/Contract Number:: AC52-07NA27344

OSTI ID:: 1992575

Report Number(s):: LLNL-JRNL-830197; 1046429

Journal Information:: Physics of Fluids, Journal Name: Physics of Fluids Journal Issue: 6 Vol. 35; ISSN 1070-6631

Publisher:: American Institute of Physics (AIP)Copyright Statement

Country of Publication:: United States

Language:: English

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Chapman–Jouguet deflagration criteria and compressibility dynamics of turbulent fast flames for turbulence-induced deflagration-to-detonation transition

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