界面邻近效应对激波诱导重气柱演化的影响  

Interface Proximity Effect on the Evolution of a Shock-Accelerated Heavy Gas Cylinder

作　　者：杨欢欢 张恩来 李欣竹[1] 邹立勇[1] YANG Huanhuan;ZHANG Enlai;LI Xinzhu;ZOU Liyong(National Key Laboratory of Shock Wave and Detonation Physics,Institute of Fluid Physics,China Academy of Engineering Physics,Mianyang 621999,Sichuan,China)

机构地区：[1]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全国重点实验室,四川绵阳621999

出　　处：《高压物理学报》2025年第5期1-13,共13页Chinese Journal of High Pressure Physics

基　　金：国家自然科学基金(12102407,12472397,92052108);冲击波物理与爆轰物理全国重点实验室基金(JCKYS2023212003,JCKYS2022212006)。

摘　　要：针对实际应用中激波与物质近表面杂质及孔洞等相互作用中的界面邻近效应,通过数值模拟开展了下游平面重-轻界面对激波诱导重气柱演化影响的简化机理研究。结果表明,激波冲击气柱形成的衍射和透射波系依次冲击下游界面,在气柱与下游界面之间形成来回反射的波系结构,这些波系不仅影响气柱的界面演化,而且在下游界面诱导产生射流。在不同的界面间距条件下,气柱外部衍射波系在下游界面的反射波系不同,这些反射波系及气柱内部聚焦波系冲击气柱右极点的先后顺序也存在差异。当界面间距较小时,气柱射流可以穿透气柱与下游界面之间的间隙流体,并与下游界面射流耦合,显著促进气柱射流的演化。随着界面间距的增大,射流耦合现象逐渐减弱,重气柱演化涡对抑制了气柱射流的发展。当界面间距进一步增大时,气柱射流又会因下游界面反射稀疏波系的拉伸作用而被促进。此外,在不同的界面间距条件下,下游界面的存在均对气柱界面宽度、高度的发展及环量沉积起到促进作用。To uncover the interface proximity effect arising from the interaction between shock wave and near-surface impurity and hole of material in practical applications,a simplified mechanism study on the influence of downstream planar heavy-light interfaces on the evolution of a shock-accelerated heavy gas cylinder was carried out through numerical simulation.The findings reveal that the diffracted and transmitted wave systems formed by the incident shock impacting the heavy gas cylinders successively interact with the downstream planar slow-fast interface,leading to the formation of wave systems that reflect back and forth between the gas cylinder and the downstream planar slow-fast interface.Significantly,these wave systems not only govern the evolution of the gas cylinder interface but also trigger the generation of jets at the downstream planar slow-fast interfaces.Under diverse interfacial spacing conditions,the type of reflected waves originating from the diffracted wave system outside the gas cylinder varies at the downstream interface,and the sequence of the reflected wave system and the focused wave system inside the gas cylinder interacting with the right pole of the gas cylinder is different.When the interfacial distance is narrow,the gas cylinder jet can permeate the gap fluid sandwiched between the gas cylinder and the downstream slow-fast interface and couple with the jet at the downstream planar slow-fast interface,which significantly promotes the evolution of the gas cylinder jet.As the interfacial distance increases,the jet coupling phenomenon progressively wanes,and the gas cylinder jet succumbs to the inhibitory effect of the vortex pair within the gas cylinder.With a further augmentation in interfacial distance,the gas cylinder jet will be promoted by the stretching effect of the reflected rarefaction wave system at the downstream interface.In addition,under different interface spacing conditions,the presence of a downstream planar slow-fast interface invariably augments the development of interfac

关 键 词：激波 RICHTMYER-MESHKOV不稳定性 气柱 射流 微喷射 环量 

分 类 号：O354.5[理学—流体力学] O521.9[理学—力学]