Eulerian-Lagrangian modelling of detonative combustion in two-phase gas-droplet mixtures with OpenFOAM: Validations and verifications

Huang, Zhiwei; Zhao, Majie; Xu, Yong; Li, Guangze; Zhang, Huangwei

doi:10.1016/j.fuel.2020.119402

Cited by 96 publications

(34 citation statements)

References 57 publications

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“…The chemical source terms are integrated with an Euler implicit method. Its accuracy can be confirmed through comparing with other advanced ODE integrators [13]. Two-step reaction of 6 species (n-C7H16, O2, CO, CO2, H2O and N2) [21] is used for n-heptane detonation.…”

Section: Governing Equation and Numerical Methodsmentioning

confidence: 98%

“…For the liquid phase, they are solved using first-order implicit Euler method, which is sufficiently accurate with the time step used in this work (about 10 -9 s). Detailed validations and verifications of the solver and sub-models are performed in our recent work [13]. Satisfactory accuracies are achieved in predicting shock wave, detonation propagation speed, and detonation cell size.…”

Section: Governing Equation and Numerical Methodsmentioning

confidence: 99%

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Numerical simulation of two-dimensional detonation propagation in partially pre-vaporized n-heptane sprays

Zhao

Zhang

2021

ICLASS

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In this paper, two-dimensional detonation propagation in partially pre-vaporized n-heptane sprays is studied by using Eulerian-Lagrangian methods. The effects of droplet preevaporation on the detonation propagation are investigated. The general features and detailed structures of two-phase detonations are well captured with the present numerical methods. The results show that the detonation propagation speed and detonation structures are significantly affected by the pre-evaporated gas equivalence ratio. The numerical soot foils are used to characterize the influence of pre-evaporated gas equivalence ratio on the detonation propagation. Regular detonation cellular structures are observed for large pre-evaporated gas equivalence ratios, but when decreasing the pre-evaporated gas equivalence ratio, the detonation cellular structures become much more unstable and the average cell width also increases. It is also found that the pre-evaporated gas equivalence ratio has little effects on the volume averaged heat release when the detonation propagates stably. Moreover, the results also suggest that the detonation can propagate in the two-phase n-heptane/air mixture without pre-evaporation, but the detonation would be first quenched and then re-ignited when the pre-evaporated gas equivalence ratio is small or equal to zero.

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Section: Governing Equation and Numerical Methodsmentioning

confidence: 98%

Section: Governing Equation and Numerical Methodsmentioning

confidence: 99%

Numerical simulation of two-dimensional detonation propagation in partially pre-vaporized n-heptane sprays

Zhao

Zhang

2021

ICLASS

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“…The gas and liquid phase governing equations are solved by a compressible two-phase reacting flow solver, RYrhoCentralFoam [27], which has been successfully applied for various detonation problems [28][29][30][31][32]. The hydrogen mechanism with 9 species and 19 reactions [33] is used, which is validated against the measured ignition delay and detonation cell size [34].…”

Section: Governing Equation and Computational Methodsmentioning

confidence: 99%

“…More detailed information about the numerical methods for gas and liquid phases can be found in Ref. [27].…”

Section: Governing Equation and Computational Methodsmentioning

confidence: 99%

Effect of water droplet breakup on hydrogen/air detonations

Zhao

Zhang

2021

ICLASS

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Two-dimensional numerical simulations with Eulerian-Lagrangian method are conducted to study the influence of fine water droplet breakup on detonation propagation in stoichiometric hydrogen/air mixture. General features of gas phase and water droplets are well captured. Numerical soot foils are used to characterize the influence of droplet breakup on the detonation wave, and the results confirm that droplet disintegration make propagation detonation wave more stable under the studied conditions. Analysis on unsteady detonation propagation process is performed with the evolutions of spatial distribution of interphase transfer rates (mass, energy, and momentum). The interactions between detonation wave and water droplets demonstrate that the breakup model have more pronounced influence on mass and energy transfer than the momentum transfer. Moreover, high interphase transfer rates of disintegration case are observed at the onset of detonation propagation, and they gradually decrease. It is concluded that inclusion of droplet breakup significantly alters propagation and two-phase coupling of the gaseous detonation in fine water mists.

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“…The numerical implementation of the hybrid Eulerian/Lagrangian compressible MMC-LES model into the mmcFoam suite of solvers [35] was recently presented in [29]. The Eulerian scheme is based on the RYrhoCentralFoam solver [39][40][41] which has been validated previously for a range of benchmark problems, including Sod's shock tube, a forward-facing step, a supersonic jet and shockvortex interaction [39,40]. The stochastic Lagrangian particle implementation is presented and extensively validated in [35] and has been augmented to include compressible pressure work and viscous heating terms in [29].…”

Section: Numerical Implementationmentioning

confidence: 99%

Large eddy simulation of a supersonic lifted hydrogen flame with sparse-Lagrangian multiple mapping conditioning approach

Huang

Cleary

Ren

et al. 2022

Combustion and Flame

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Eulerian-Lagrangian modelling of detonative combustion in two-phase gas-droplet mixtures with OpenFOAM: Validations and verifications

Cited by 96 publications

References 57 publications

Numerical simulation of two-dimensional detonation propagation in partially pre-vaporized n-heptane sprays

Numerical simulation of two-dimensional detonation propagation in partially pre-vaporized n-heptane sprays

Effect of water droplet breakup on hydrogen/air detonations

Large eddy simulation of a supersonic lifted hydrogen flame with sparse-Lagrangian multiple mapping conditioning approach

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