Richtmyer-Meshkov不稳定的双椭圆气柱相互作用的PIV研究
发布时间：2018-07-14 12:42
【摘要】：激波冲击双气柱既包含了激波与界面的相互作用又包含了界面之间的相互作用,是探索实际应用中Richtmyer-Meshkov(RM)不稳定性演化的很好的桥梁.利用高分辨率的粒子图像测速(PIV)技术获得了4种不同初始中心间距的双椭圆气柱在平面激波冲击下的速度场、涡量场和环量,定量表征了界面相互作用对RM不稳定性演化的影响.界面相互作用较弱时,双椭圆气柱的演化由两对涡对结构主导,内涡弱于外涡,且随着中心间距的减小内涡的弱化愈加显著;界面相互作用较强时,双椭圆气柱演化模式发生转变,内涡消失,只由一对涡对结构主导,外涡随中心间距的减小而增强.界面相互作用导致双椭圆气柱的演化行为与单椭圆气柱的演化行为不同,典型的特征是内涡的削弱及涡对结构的旋转运动.双椭圆气柱演化行为与双圆气柱演化行为也存在差别,表现为强界面相互作用时外涡随中心间距的减小而增强.
[Abstract]:The shock double gas column contains both the interaction between shock wave and interface and the interaction between interface. It is a good bridge to explore the evolution of Richtmyer-Meshkov (RM) instability in practical applications. High resolution particle image velocimetry (PIV) technique is used to obtain the velocity field, vorticity field and annulus of four kinds of double elliptical gas cylinders with different initial center spacing under the impact of plane shock wave. The influence of interfacial interaction on the evolution of RM instability was quantitatively characterized. When the interface interaction is weak, the evolution of the double elliptical gas column is dominated by two pairs of vortices, and the internal vortex is weaker than the external vortex, and the weakening of the internal vortex becomes more obvious with the decrease of the center distance, while the interaction between the two ellipses is stronger than that of the external vortex. The evolutional model of the double elliptical gas column changes and the internal vortex disappears, only a pair of vortices dominate the structure, and the outer vortex increases with the decrease of the center distance. The evolution behavior of double elliptical gas column is different from that of single elliptical gas column due to the interfacial interaction. The typical characteristics are the weakening of internal vortex and the rotating motion of vortex to the structure. The evolution behavior of double elliptical gas column is also different from that of double circular gas column, which shows that the external vortex increases with the decrease of center spacing when the interface is strong.
【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国防科技重点实验室;浙江理工大学机械与自动控制学院;
【基金】：国家自然科学基金(批准号:11172278,11472253,11302201) 中国工程物理研究院科学技术发展基金(编号:2014B0201017)资助项目
【分类号】：O354.5
本文编号：2121681
[Abstract]:The shock double gas column contains both the interaction between shock wave and interface and the interaction between interface. It is a good bridge to explore the evolution of Richtmyer-Meshkov (RM) instability in practical applications. High resolution particle image velocimetry (PIV) technique is used to obtain the velocity field, vorticity field and annulus of four kinds of double elliptical gas cylinders with different initial center spacing under the impact of plane shock wave. The influence of interfacial interaction on the evolution of RM instability was quantitatively characterized. When the interface interaction is weak, the evolution of the double elliptical gas column is dominated by two pairs of vortices, and the internal vortex is weaker than the external vortex, and the weakening of the internal vortex becomes more obvious with the decrease of the center distance, while the interaction between the two ellipses is stronger than that of the external vortex. The evolutional model of the double elliptical gas column changes and the internal vortex disappears, only a pair of vortices dominate the structure, and the outer vortex increases with the decrease of the center distance. The evolution behavior of double elliptical gas column is different from that of single elliptical gas column due to the interfacial interaction. The typical characteristics are the weakening of internal vortex and the rotating motion of vortex to the structure. The evolution behavior of double elliptical gas column is also different from that of double circular gas column, which shows that the external vortex increases with the decrease of center spacing when the interface is strong.
【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国防科技重点实验室;浙江理工大学机械与自动控制学院;
【基金】：国家自然科学基金(批准号:11172278,11472253,11302201) 中国工程物理研究院科学技术发展基金(编号:2014B0201017)资助项目
【分类号】：O354.5
【相似文献】
相关期刊论文 前2条
1 邹立勇;刘金宏;谭多望;黄文斌;柏劲松;刘仓理;;弱激波冲击无膜重气柱和气帘界面的实验研究[J];高压物理学报;2010年04期
2 ;[J];;年期
相关会议论文 前1条
1 王显圣;司廷;罗喜胜;;界面初始密度分布对反射激波-气柱相互作用影响的数值研究[A];第十五届全国激波与激波管学术会议论文集（下册）[C];2012年
相关博士学位论文 前1条
1 王明虎;平面激波与多边形气柱相互作用的实验研究[D];中国科学技术大学;2015年
，本文编号：2121681
本文链接：https://www.wllwen.com/kejilunwen/lxlw/2121681.html
