激波与椭圆形重气柱相互作用的PLIF实验
发布时间：2018-08-08 13:20
【摘要】：在水平激波管中,采用平面激光诱发荧光(planar laser-induced fluorescence,PLIF)方法对椭圆形重气柱界面的Richtmyer-Meshkov不稳定性进行实验。气柱由SF6混入一定比例的丙酮蒸气构成,环境气体为空气。通过改变椭圆形气柱的长短轴比值,得到了激波马赫数为1.25时,3种初始界面的演化形态。通过相对体积分数标定,得到了界面失稳演化过程中的相对体积分数分布,观察到了激波作用后界面气体聚集、转移、消散等现象。实验结果发现,对于流向轴长与展向轴长之比较大的气柱界面,初始界面产生的涡量更大且分布更广,其界面不稳定性发展得越迅速和剧烈。失稳发展迅速的界面甚至出现涡对碰撞并产生尾部射流结构的现象。初始界面直接决定了失稳发展初期形成的涡对强度和间距,并对后期演化有重要影响。
[Abstract]:In a horizontal shock tube, the Richtmyer-Meshkov instability at the interface of an elliptical heavy gas column was investigated by planar laser-induced fluorescence (PLIF) method. The gas column consists of a certain proportion of acetone vapor mixed with SF6, and the ambient gas is air. By changing the ratio of the long and short axis of the elliptical gas column, the evolution of three initial interfaces is obtained when the Mach number of shock wave is 1.25. Through the relative volume fraction calibration, the relative volume fraction distribution in the evolution process of interface instability is obtained, and the phenomena of gas accumulation, transfer and dissipation at the interface after shock wave action are observed. The experimental results show that the vorticity generated by the initial interface is larger and more widely distributed, and the instability of the interface develops more rapidly and intensely for the gas-column interface where the axial length of the flow direction is larger than that of the spanned axial length. The unstable interface even appears the phenomenon of vortex-pair collision and the structure of the tail jet. The initial interface directly determines the strength and spacing of the vortices formed in the initial stage of instability development, and has an important effect on the later evolution.
【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】：国家自然科学基金项目(11172278,11302201,11472253)
【分类号】：O354.5
本文编号：2171903
[Abstract]:In a horizontal shock tube, the Richtmyer-Meshkov instability at the interface of an elliptical heavy gas column was investigated by planar laser-induced fluorescence (PLIF) method. The gas column consists of a certain proportion of acetone vapor mixed with SF6, and the ambient gas is air. By changing the ratio of the long and short axis of the elliptical gas column, the evolution of three initial interfaces is obtained when the Mach number of shock wave is 1.25. Through the relative volume fraction calibration, the relative volume fraction distribution in the evolution process of interface instability is obtained, and the phenomena of gas accumulation, transfer and dissipation at the interface after shock wave action are observed. The experimental results show that the vorticity generated by the initial interface is larger and more widely distributed, and the instability of the interface develops more rapidly and intensely for the gas-column interface where the axial length of the flow direction is larger than that of the spanned axial length. The unstable interface even appears the phenomenon of vortex-pair collision and the structure of the tail jet. The initial interface directly determines the strength and spacing of the vortices formed in the initial stage of instability development, and has an important effect on the later evolution.
【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】：国家自然科学基金项目(11172278,11302201,11472253)
【分类号】：O354.5
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，本文编号：2171903
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