Shock wave and flame front induced detonation in a rapid compression machine

Wang, Y.; Qi, Yunliang; Xiang, Shouzhi; Mével, Rémy; Wang, Z.

doi:10.1007/s00193-018-0832-2

Cited by 12 publications

(10 citation statements)

References 38 publications

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“…This allows for a more meaningful comparison between the planar and cylindrical shock cases. The domain, initial and boundary conditions chosen correspond to those used in the super-knock experiments performed by Wang et al [5][6][7] . Further discussion is provided in 15 section VI A.…”

Section: Curved Interfacesmentioning

confidence: 99%

“…Auto-ignition in the end-gas is due to the high temperature and pressure attained in this region. A local explosion in the compressed fresh mixture is observed and the rapid expansion of the burning gas induces the formation of a shock wave 3,[5][6][7] . Detonation initiation, or super-knock onset, results from the shock wave initiated by the end-gas local explosion upon interaction with the engine's confinement, the pre-ignition flame, or another shock wave created at a different location within the end-gas 3,[5][6][7] .…”

Section: Introductionmentioning

confidence: 99%

“…Experiments performed in a rapid compression machine (RCM) have enabled the identification of three modes, or mechanisms, of super-knock initiation based on the dynamics of the shock wave generated by the local explosion in the end-gas. The energy density of the reactive mixture was found to be the dominant parameter determining which mode of super-knock onset is taking place 2,6,7 . The first mode is referred to as Shock Wave Reflection Induced Detonation (SWRID).…”

Section: Introductionmentioning

confidence: 99%

“…The present paper focuses on the second mode of super-knock initiation during which shock wave refraction takes place and results in detonation onset. Wang et al 7 showed by combining high-speed experimental imaging and numerical simulation that the interplay between the shock wave generated by the end-gas auto-ignition and the spherical flame results in thermodynamic conditions that are prone to flame acceleration and detonation onset. However, the high computational cost of the reactive simulation performed by Wang et al 7 prevented the use of adequate resolution to resolve the structure of the refraction pattern.…”

Section: Introductionmentioning

confidence: 99%

“…Wang et al 7 showed by combining high-speed experimental imaging and numerical simulation that the interplay between the shock wave generated by the end-gas auto-ignition and the spherical flame results in thermodynamic conditions that are prone to flame acceleration and detonation onset. However, the high computational cost of the reactive simulation performed by Wang et al 7 prevented the use of adequate resolution to resolve the structure of the refraction pattern. Shock wave refraction is a complex interaction between a shock wave and an interface (gas-gas or gas-liquid) 8 .…”

Section: Introductionmentioning

confidence: 99%

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Shock wave refraction patterns at a slow–fast gas–gas interface at superknock relevant conditions

et al. 2021

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Shock wave refraction theory and high-resolution numerical simulations were employed to predict the refraction pattern under super-knock relevant conditions at slow-fast gas-gas interfaces which are characterized by a higher acoustic impedance in the incident phase than in the transmitted phase. First, our theoretical and computational methodologies were validated against results from the literature for planar shock-planar oblique interface interactions. Second, our framework was applied to planar shock-/cylindrical shock-cylindrical interface interactions. The theoretical regime diagram agrees well with the numerical predictions for the former configuration whereas significant discrepancies were observed for the latter. Numerical results show the formation of temperature and pressure peaks as the refraction structure transits from a Free Precursor Refraction to a Twin von Neumann Refraction. This change in thermodynamic state can induce a significant reduction in ignition delaytime, potentially leading to detonation onset.

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Section: Curved Interfacesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Shock wave refraction patterns at a slow–fast gas–gas interface at superknock relevant conditions

et al. 2021

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Effect of the reactor model on steady detonation modeling

Chatelain

Mével

et al. 2021

Shock Waves

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The effect of employing four different reactor models, Zeldovich-von Neumann-Döring (ZND), constant volume (CV), constant pressure (CP), and the Shock routine from Chemkin, to perform detonation relevant chemical modeling was assessed. The simulation results were compared in terms of characteristic length-scales and chemical analyses with four representative mixtures:The following conclusions were drawn: (i) CV and CP reactor models shorten the induction zone length and strengthen the energy release rate in most mixtures. In terms of chemical kinetics, the impact of CP and CV reactor models is quite limited for H 2 -O 2 -N 2 mixtures and H 2 -NO 2 /N 2 O 4 . However, the C2 branch is enhanced in CV and CP reactor models for C 3 H 8 -O 2 -N 2 mixture. Moreover, both reactor models weaken the intermediate-temperature chemistry and promote the high-temperature chemistry for DME-O 2 -CO 2 mixtures; (ii) the Shock module can be employed to perform detonation modeling, as it provided similar results to the ZND simulations for all investigated

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Geometry effect in reactive shock-elliptic bubble interactions

Wang

Zhang

et al. 2021

Acta Mech. Sin.

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Shock wave and flame front induced detonation in a rapid compression machine

Cited by 12 publications

References 38 publications

Shock wave refraction patterns at a slow–fast gas–gas interface at superknock relevant conditions

Shock wave refraction patterns at a slow–fast gas–gas interface at superknock relevant conditions

Effect of the reactor model on steady detonation modeling

Geometry effect in reactive shock-elliptic bubble interactions

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