CAJ | 학술논문

丝阵烧蚀在丝阵Z箍缩动力学中扮有重要角色,透彻理解丝阵烧蚀对于丝阵Z箍缩动力学的研究至关重要.采用简单模型数值模拟了烧蚀过程,该模型物理上采用绝热、单流体、单相、磁流体力学近似,数值上采用欧拉法结合保单调输运格式来离散.数值结果很好地展示了烧蚀过程的主要特征,例如芯-冕结构、径向等离子体流、轴线上先驱等离子体柱的形成、静止丝芯的长寿命以及延长的烧蚀期,一些关键时间参数定量或定性地相符于文献报道的实验和数值结果,例如冕等离子体角向融合的时刻、等离子体首次到达轴线的时刻、丝芯静止持续的时间、最后的箍缩滞止时刻,但某些方面略有差异.
사진소식재사진Z고축동역학중분유중요각색,투철리해사진소식대우사진Z고축동역학적연구지관중요.채용간단모형수치모의료소식과정,해모형물리상채용절열、단류체、단상、자류체역학근사,수치상채용구랍법결합보단조수운격식래리산.수치결과흔호지전시료소식과정적주요특정,례여심-면결구、경향등리자체류、축선상선구등리자체주적형성、정지사심적장수명이급연장적소식기,일사관건시간삼수정량혹정성지상부우문헌보도적실험화수치결과,례여면등리자체각향융합적시각、등리자체수차도체축선적시각、사심정지지속적시간、최후적고축체지시각,단모사방면략유차이.
A good understanding of Z-pinch wire array ablation is of critical importance to the study of the dynamics of the wire array Z-pinch.To model the ablation process,a two-dimensional (2D) magnetohydrodynamics (MHD) program called FOI has been developed.The ablation is approximated in an adiabatic single-fluid single-phase MHD framework.Eulerian computation is adopted with a monotonic advection scheme.The numerical results obtained from FOI successfully qualitatively demonstrate the primary aspects of the ablation process,such as the core-corona structure,radial plasma streams,the formation of an on-axis precursor plasma column,longevity of the stationary wire cores and the extended ablation phase,though some discrepancies are observed.