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.

中文翻译：

---

具有热力学非平衡效应的非定常爆轰动力学模拟

由于其细观动力学性质，离散玻尔兹曼方法能够研究具有基本流体力学和热力学非平衡效应的非定常爆轰。在这项工作中，采用一种高效且精确的反应离散玻尔兹曼方法来研究初始扰动的振幅和波长以及化学热对具有非平衡效应的不稳定爆轰演变的影响。结果表明，初始扰动幅值只影响早期的非定常爆轰，后期爆轰变得自相似，相位差异很小。对于小波长，压力在早期以较高的振荡频率增加得更快，但随后很快减小。随着化学放热的增加，压力及其振荡增加，非平衡效应变得更加明显，但振荡周期减少。当波长或化学放热足够小时，不存在横波或蜂窝状结构，二维非定常爆轰简化为一维情况。