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Kinetic Simulation of Unsteady Detonation with Thermodynamic Nonequilibrium Effects

Lin, C; Luo, KH; (2020) Kinetic Simulation of Unsteady Detonation with Thermodynamic Nonequilibrium Effects. Combustion, Explosion and Shock Waves , 56 (4) pp. 435-443. 10.1134/S0010508220040073.

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Abstract

Thanks to its mesoscopic kinetic nature, the discrete Boltzmann method has a capability of investigating unsteady detonation with essential hydrodynamic and thermodynamic nonequilibrium effects. In this work, an efficient and precise reactive discrete Boltzmann method is employed to investigate the impact of the amplitude and wave length of the initial perturbation, as well as of the chemical heat on the evolution of unsteady detonation with nonequilibrium effects. It is shown that the initial perturbation amplitude only affects the unsteady detonation in the early period, and the detonation becomes self-similar with minor phase differences later on. For small wave lengths, the pressure increases faster with a higher oscillation frequency in the early period, but decreases soon afterwards. With increasing chemical heat release, the pressure and its oscillations increase, and the nonequilibrium effects become more pronounced, but the oscillatory period decreases. When the wave length or chemical heat release is small enough, there is no transverse wave or cellular pattern, and the two-dimensional unsteady detonation reduces to the one-dimensional case.

Type: Article
Title: Kinetic Simulation of Unsteady Detonation with Thermodynamic Nonequilibrium Effects
DOI: 10.1134/S0010508220040073
Publisher version: http://dx.doi.org/10.1134/S0010508220040073
Language: English
Additional information: This version is the author accepted manuscript. For information on re-use, please refer to the publisher’s terms and conditions.
Keywords: unsteady detonation, thermodynamic nonequilibrium
UCL classification: UCL
UCL > Provost and Vice Provost Offices
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science > Dept of Mechanical Engineering
URI: https://discovery.ucl.ac.uk/id/eprint/10109325
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