微喷颗粒与气体混合过程的数值模拟研究  

Numerical simulation on mixing process of ejecta and gas

作　　者：王裴[1] 孙海权[1] 邵建立[1] 秦承森[1] 李欣竹[2] 

机构地区：[1]北京应用物理与计算数学研究所计算物理实验室,北京100094 [2]中国工程物理研究院流体物理研究所冲击波物理与爆轰物理实验室,绵阳621900

出　　处：《物理学报》2012年第23期335-341,共7页Acta Physica Sinica

摘　　要：冲击波作用下金属与气体界面将发生微喷混合现象,即金属表面产生的微喷射物质在气体中的输运过程.提出采用散体颗粒分布代替微喷初始状态,基于气体-颗粒两相流模型对微喷混合现象进行了模拟研究.数值模拟给出了微喷混合的动力学演化过程,分析了初始气体压力和颗粒尺寸因素对混合层的影响规律;在数值模拟中发现了微喷颗粒的气动破碎现象,这可导致颗粒尺度明显减小,成为影响微喷混合演化性质的重要物理因素.本文模拟结果与相关实验结果取得一致,初步表明,气粒两相流模型是模拟微喷混合过程的一种有效方法.Ejecta mixing takes place at the interface between metal and gas under shock loading, i.e., the transport process of ejecta from metal surface appears in the gas. In this paper, adopting disperse particles instead of the initial ejecta, we simulate the ejection mixing process according to two-phase flow of gas and particle. We give the numerical results of the evolution process of the mixing, and analyze the effects of initial gas pressure and particle size on the mixing zone. The pneumatic break is observed from the numerical simulations, which can lead to evident reduction of the particle and then become an important factor affecting the evolution of mixture; also, our simulations are consistent with the corresponding measurements, showing that the gas and particle two-phase flow model is an effective method to simulate the ejection mixing.

关 键 词：微喷射 两相流 冲击 混合 

分 类 号：O347.5[理学—固体力学]