冲击波作用下微米尺度金属颗粒群的动力学行为

发布时间：2019-01-12 16:47

【摘要】：基于平面化爆驱动飞片高压加载技术和激光测速技术,研究了冲击波加载不同粒径锡颗粒群的微喷射行为以及在空气中的减速规律.实验结果表明,锡颗粒的最快喷射速度随粒径增大而显著增大.通过对微喷射形成过程的三维光滑粒子流体动力学方法数值模拟发现,大粒径锡颗粒之间存在较大的空隙结构,冲击波与空隙结构的相互作用诱导产生高速汇聚射流,空隙结构越大对应的喷射速度也越高.此外,通过研究不同粒径颗粒在复杂流场中的减速规律,进一步深化了对微喷射破碎后的颗粒尺度状态以及混合输运特性的认识.研究结果对于预测和分析冲击波加载微米颗粒群的微喷混合特性具有一定价值.
[Abstract]:Based on high-pressure loading technique and laser velocimetry technique of flyer driven by plane explosion, the behavior and deceleration of tin particles with different particle sizes under shock wave loading were studied. The experimental results show that the fastest injection velocity of tin particles increases significantly with the increase of particle size. Through the numerical simulation of 3D smooth particle hydrodynamics in the process of micro jet formation, it is found that there is a large void structure between large diameter tin particles, and the interaction between shock wave and void structure induces a high velocity convergent jet. The larger the void structure, the higher the injection velocity. In addition, by studying the deceleration law of particles with different particle sizes in complex flow field, the understanding of particle size state and mixed transport characteristics after micro-jet fragmentation is further deepened. The results are valuable for predicting and analyzing the mixing characteristics of microparticles loaded with shock waves.
【作者单位】：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重点实验室;
【基金】：科学挑战专题(批准号:JCKY2016212A501)资助的课题~~
【分类号】：O347.7

【相似文献】