Adaptive mesh refinement based simulations of three-dimensional detonation combustion in supersonic combustible mixtures with a detailed reaction model

Cai, Xiaodong; Liang, Jianhan; Deiterding, Ralf; Che, Yue; Lin, Zhiyong

doi:10.1016/j.ijhydene.2015.11.093

Cited by 51 publications

(16 citation statements)

References 79 publications

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“…The formation of an overdriven detonation is a result of the continuous hot jet injection [27]. Because of the combination of two different mixtures in the channel, the detonation front in Fig.15 varies considerably, which is different from that in uniform supersonic combustible mixtures [65]. However, according to Fig.16(a), oscillations of the detonation front are very regular with an oscillation period of 21.72 μs…”

Section: Mixture Group G21mentioning

confidence: 97%

Numerical simulation on detonation initiation and propagation in supersonic combustible mixtures with nonuniform species

Cai¹,

Liang²,

Deiterding

et al. 2015

20th AIAA International Space Planes and Hypersonic Systems and Technologies Conference

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Section: Mixture Group G21mentioning

confidence: 97%

Numerical simulation on detonation initiation and propagation in supersonic combustible mixtures with nonuniform species

Cai¹,

Liang²,

Deiterding

et al. 2015

20th AIAA International Space Planes and Hypersonic Systems and Technologies Conference

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“…6(a). It has been demonstrated that the Mach stem is in fact a local Mach detonation (Cai et al 2016c), indicating the detonation onset in the supersonic combustible mixture. Due to the formation of the contractive passage generated by the upper wall and the free boundary of the slip line directly behind the triple point, the Mach detonation propagates forward towards the incoming combustible mixture, as shown in Fig.…”

Section: Hot Jet Initiationmentioning

confidence: 99%

Diffusion and mixing effects in hot jet initiation and propagation of hydrogen detonations

et al. 2017

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In the present work, the role of diffusion and mixing in hot jet initiation and detonation propagation in a supersonic combustible hydrogen–oxygen mixture is investigated in a two-dimensional channel. A second-order accurate finite volume method solver combined with an adaptive mesh refinement method is deployed for both the reactive Euler and Navier–Stokes equations in combination with a one-step and two-species reaction model. The results show that the small-scale vortices resulting from the Kelvin–Helmholtz instability enhance the reactant consumption in the inviscid result through the mixing. However, the suppression of the growth of the Kelvin–Helmholtz instability and the subsequent formation of small-scale vortices imposed by the diffusion in the viscous case can result in the reduction of the mixing rate, hence slowing the consumption of the reactant. After full initiation in the whole channel, the mixing becomes insufficient to facilitate the reactant consumption. This applies to both the inviscid and viscous cases and is due to the absence of the unburned reactant far away from the detonation front. Nonetheless, the stronger diffusion effect in the Navier–Stokes results can contribute more significantly to the reactant consumption closely behind the detonation front. However, further downstream the mixing is expected to be stronger, which eventually results in a stronger viscous detonation than the corresponding inviscid one. At high grid resolutions it is vital to correctly consider physical viscosity to suppress intrinsic instabilities in the detonation front, which can also result in the generation of less triple points even with a larger overdrive degree. Numerical viscosity was minimized to such an extent that inviscid results remained intrinsically unstable while asymptotically converged results were only obtained when the Navier–Stokes model was applied, indicating that solving the reactive Navier–Stokes equations is expected to give more correct descriptions of detonations.

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“…Ref [21][22][23] ). Cai et al 24 found that the sidewalls in a three-dimensional rectangular channel can help realize detonation initiation in supersonic combustible mixtures. However, few studies have focused on detonation initiation in a circular tube, which is more general in practical applications.…”

Section: Introductionmentioning

confidence: 99%

Three-dimensional simulations of detonation propagation in circular tubes: Effects of jet initiation and wall reflection

Mahmoudi

2020

Physics of Fluids

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In the present work, using a high-resolution three-dimensional numerical analysis the initiation and propagation mechanism of a detonation wave is studied in a circular tube with a hot jet initiation. The reactive Euler equations with a one-step two-species chemistry model are solved based on the structured adaptive mesh refinement technique. Influences of both a single hot jet and impinging double hot jets on the formation of the detonation wave are studied. For each case, the objective is to investigate the role of the tube wall on the initiation and propagation of the detonation wave. The result for both cases shows that the hot jet-induced bow shock forms a complex reflection structure in the circular tube. The reflection effect of the circular wall strengthens the shock and facilitates the formation of the Mach stem, which leads to the formation of the detonation wave. However, when the hot jet condition and the total area of jet hole remain the same, for the case of initiation using double hot jets, the reflection strength of the bow shocks weakens when the diameters of the hot jets become smaller. When using a single hot jet, the initiated detonation is overdriven and propagates in the twoheaded mode. In this initiation mode, by increasing the inflow Mach number, a four-headed mode detonation front is formed. While in the case of impinging double hot jets, a four-headed mode detonation front is initiated directly.

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Adaptive mesh refinement based simulations of three-dimensional detonation combustion in supersonic combustible mixtures with a detailed reaction model

Cited by 51 publications

References 79 publications

Numerical simulation on detonation initiation and propagation in supersonic combustible mixtures with nonuniform species

Numerical simulation on detonation initiation and propagation in supersonic combustible mixtures with nonuniform species

Diffusion and mixing effects in hot jet initiation and propagation of hydrogen detonations

Three-dimensional simulations of detonation propagation in circular tubes: Effects of jet initiation and wall reflection

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