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首页> 外文期刊>Combustion Science and Technology >ON THE ROLE OF AMBIENT REACTIVE PARTICLES IN THE MIXING AND AFTERBURN BEHIND EXPLOSIVE BLAST WAVES
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ON THE ROLE OF AMBIENT REACTIVE PARTICLES IN THE MIXING AND AFTERBURN BEHIND EXPLOSIVE BLAST WAVES

机译：爆炸性波在混合和之后燃烧中反应性粒子的作用

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A hybrid two-phase numerical methodology is used to study the propagation of explosive blast waves from spherical charges of TNT and their interaction with an ambient dilute distribution of aluminum particles. The presence of these particles is found to cause perturbations at the contact surface between the inner detonation products and the outer shock-compressed air, which results in Rayleigh-Taylor instabilities at the contact surface. These instabilities grow in time, thereby creating a mixing layer characterized by enhanced mixing between the detonation products and air, resulting in afterburn. The afterburn energy release is observed to affect the pressure decay rate behind the blast wave and the speed and the strength of the secondary shock. The passage of the secondary shock through the mixing layer results in a Richtmyer-Meshkov instability, which is characterized by the creation of vorticity in the mixing layer through baroclinic torque effects. This phenomenon is observed to sustain the mixing process subsequently. The amount of mixing and afterburn are investigated for a range of aluminum particle sizes, mass loading, and initial distribution, and the role played by these particles in the growth of hydrodynamic instabilities is studied. It is shown that for the range of sizes investigated, particle size does not play a significant role in the mixing, but the initial distribution and mass loading do have appreciable impact. Furthermore, the late stages of the afterburn are observed to be self-similar, and independent of the initial triggering of the hydrodynamic instabilities. This study has provided some useful insights on the instabilities induced by ambient reactive particles in detonation flowfields and establishes a simulation capability to study turbulent two-phase processes in an explosive environment.
机译：混合两相数值方法用于研究TNT球形装药爆炸爆炸波的传播及其与铝颗粒的稀环境分布的相互作用。发现这些颗粒的存在会在内部爆炸产物和外部冲击压缩空气之间的接触表面处引起扰动，从而导致接触表面处的瑞利泰勒不稳定性。这些不稳定性会随时间增长，从而形成一个混合层，其特征是爆炸产物与空气之间的混合增强，从而导致再燃。观察到加力能量释放会影响爆炸波后的压力衰减率以及二次冲击的速度和强度。二次冲击通过混合层会导致Richtmyer-Meshkov不稳定性，其特征是通过斜压转矩效应在混合层中产生涡旋。观察到该现象可随后维持混合过程。对于一定范围的铝颗粒尺寸，质量载荷和初始分布，研究了混合量和加力量，并研究了这些颗粒在流体动力学不稳定性增长中的作用。结果表明，在所研究的粒径范围内，粒径在混合过程中并未发挥重要作用，但是初始分布和质量负荷确实具有明显的影响。此外，观察到加力的后期是自相似的，并且与流体动力不稳定性的初始触发无关。这项研究为爆炸性流场中周围反应性颗粒引起的不稳定性提供了一些有用的见识，并建立了一种模拟能力，以研究爆炸性环境中的湍流两相过程。

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