期刊
PHYSICS OF FLUIDS
卷 34, 期 1, 页码 -出版社
AIP Publishing
DOI: 10.1063/5.0078556
关键词
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资金
- Air Force Office of Scientific Research [19RT0258/FA9550-19-0322]
- National Science Foundation [1914453]
- AFOSR Award [FA9550-21-1-0012]
- Div Of Chem, Bioeng, Env, & Transp Sys
- Directorate For Engineering [1914453] Funding Source: National Science Foundation
The research investigates the runaway condition and effects of compressibility on the evolution of fast turbulent flames, which may eventually lead to detonation initiation.
One of the fundamental mechanisms for detonation initiation is deflagration-to-detonation transition (DDT). This research experimentally explores the runaway condition for highly turbulent fast flames before DDT, which are characterized by extremely high turbulent flame speeds. Such fast turbulent flames experience increased effects of compressibility and may develop a runaway acceleration combined with a pressure buildup that leads to a turbulence-induced DDT (tDDT) mechanism that has been recently reported. The flame dynamics and the associated reacting flow field are characterized using simultaneous high-speed particle image velocimetry, OH* chemiluminescence, pressure measurements, and schlieren imaging. We study the flow-field conditions for runaway acceleration of fast turbulent flames and effects of compressibility on the evolution of these flames. The locally measured turbulent flame speed is found to be greater than that of a Chapman-Jouguet deflagration speed, which places the flame in the runaway transition regime that would eventually lead to a detonation.
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