On the role of transverse detonation waves in the re-establishment of attenuated detonations in methane–oxygen

Floring, Grace; Peswani, Mohnish; Maxwell, Brian

doi:10.1016/j.combustflame.2022.112497

Cited by 14 publications

(3 citation statements)

References 40 publications

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“…As the transverse detonation wave reached the upper boundary, a cellular detonation wave that filled the height of the channel was formed. The results in these two effective activation energies correspond well with previous numerical research where transverse detonation is found to play a positive role in assisting detonation reinitiation in a variety of different configurations [4]. The time history of temperature fields and numerical Schlieren images for the case of E = 12 are shown in Fig.…”

Section: Detonation Re-initiationsupporting

confidence: 87%

“…Under proper conditions, when a detonation wave diffracts from an obstacle, it may first quench and then re-initiate. This phenomenon is first captured by a series of Schlieren photographs in an early experiment performed by Teodorczyk et al [1], and has been investigated both experimentally and numerically using different types of obstacles, such as a single semi-cylindrical obstacle [2][3][4], a series of small cylindrical obstacles [5], and a porous plate [6,7]. Upon these investigations, researchers have found several mechanisms that may contribute to the re-initiation.…”

Section: Introductionmentioning

confidence: 99%

“…If the turbulent mixing behind the Mach shock is intense enough, it can dramatically promote the chemical reaction by rapidly mixing the cold unburned gas and the hot burned gas, and thus induces a detonation re-initiation. Recently, Floring et al [4] comprehensively revisited the behaviors when an established cellular detonation wave passes through a semi-cylindrical obstacle, highlighting the role of a transverse detonation wave in re-initiation events. Taking a detailed analysis of critical outcomes captured by varying the initial background pressure, they suggested that the pressure amplification behind the Mach shock might induce hot spots around the flame surface.…”

Section: Introductionmentioning

confidence: 99%

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Effect of activation energy on detonation re-initiation behaviors in hydrogen-air mixtures

Tang,

Fang,

et al. 2024

AIAA SCITECH 2024 Forum

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Two-dimensional simulations of a detonation propagating over a semi-cylinder in a channel filled with a stoichiometric hydrogen-air mixture are presented. A full set of Navier-Stokes equations is solved using a third-order WENO algorithm with HLLC flux, coupled with a calibrated, single-step chemical diffusive model (CDM). Simulation results using five different effective activation energies E = 4, 6, 10, 12 and 14 are presented featuring four distinct detonation attenuation regimes, including unattenuated detonation transmission (E = 4), critical detonation re-initiation (E = 6, and 10), cycled detonation re-initiation (E = 12), and complete quenching (E = 14). The degree of cell irregularity and the intensity of triple points are found positively correlated with the effective activation energy. With a low effective activation energy (E = 4), the CDM captures a regular cellular pattern, and the cellular structure remains intact as it propagates over the obstacle. With intermediate effective activation energies (E = 6, and 10), the detonation cell size increases and the cell structures become less regular with emerging multi-level cell structures. Here, a critical detonation re-initiation event is captured, where a strong transverse detonation wave forms following the Mach shock reflection, and eventually leads to a steady detonation propagation. At high effective activation energy (E = 12), the initial transverse detonations fail to produce a self-sustained detonation wave and multiple ignition and quenching events are found before the final establishment of the detonation wave.

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Section: Detonation Re-initiationsupporting

confidence: 87%