Spontaneous runaway of fast turbulent flames for turbulence-induced deflagration-to-detonation transition

One of the fundamental mechanisms for detonation initiation is deflagration-to-detonation transition (DDT). This research experimentally explores runaway condition highly turbulent fast flames before DDT, which are characterized by extremely high flame speeds. Such experience increased effects compressibility and may develop a acceleration combined with pressure buildup that leads to turbulence-induced DDT (tDDT) mechanism has been recently reported. The dynamics associated reacting flow field using simultaneous high-speed particle image velocimetry, OH * chemiluminescence, measurements, schlieren imaging. We study flow-field conditions on evolution these flames. locally measured speed found be greater than Chapman–Jouguet deflagration speed, places in regime would eventually lead detonation.