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柱状汇聚激波冲击单模气体界面的实验研究
Experimental study on the interaction of a single-mode gaseous interface with cylindrical converging shock waves
投稿时间: 2016-05-19  最后修改时间: 2016-05-31
DOI:
中文关键词:  柱状汇聚激波  Richtmyer-Meshkov 不稳定性  单模界面  高速纹影法
英文关键词:cylindrical converging shock  Richtmyer-Meshkov instability  single-mode interface  high-speed schlieren photograph
基金项目:国家自然科学基金项目(面上项目,重点项目,重大项目)
作者单位E-mail
李阳 中国科学技术大学 lcfy@mail.ustc.edu.cn 
丁举春 中国科学技术大学  
翟志刚 中国科学技术大学  
司廷 中国科学技术大学 tsi@ustc.edu.cn 
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中文摘要:
      在自行设计和加工的半环形汇聚激波管中,开展了柱状汇聚激波冲击单模Air/SF6气体界面的Richtmyer-Meshkov(RM)不稳定性实验研究。不同于以往的环形激波管,该激波管具有半圆形结构的实验段,使半环形管道和实验段都向外敞开,能够参考传统水平激波管的方式设置初始扰动界面和观测系统。而与楔形激波管尖角结构的实验段相比,半圆形实验段保持了完整柱状激波的对称性,并且将实验段固壁的影响降至最小。采用线约束肥皂膜的方法形成单模初始扰动界面。利用高速纹影成像技术得到了柱形汇聚激波作用下界面演化的完整过程。为了研究初始振幅对界面演化形态的影响,实验中生成了三种不同初始振幅的单模界面,并获得了三种工况下界面位移和扰动振幅随时间的变化。结果表明,汇聚激波作用下的RM不稳定性与平面激波有很大差别,主要原因在于汇聚效应,包括结构汇聚、流动压缩以及界面反相等。
英文摘要:
      The Richtmyer-Meshkov (RM) instability of a single-mode Air/SF6 gaseous interface interacting with a cylindrical converging shock is studied experimentally in a constructed semi-annular converging shock tube. Different from previous annular shock tubes, the inner core and the test section of this self-strutted facility are wide open to the outside, which provides great convenience for interface formation and flow visualization similar to the conventional horizontal shock tubes. Moreover, different from previous sharp-angle wedge test section in the ordinary shock tubes, the semi-circular test section maintains the symmetry of complete cylindrical shock waves, which can minimize the effect of the walls on the shock pattern. In this work, the single-mode interface is formed using the soap film technique, and the high-speed schlieren photography is used to capture the complete evolution of the interface deformation and the shock propagation. Three single-mode interfaces with different initial amplitudes are employed to investigate the effect of the initial amplitude on the interface evolution and the variation of interface displacement and perturbation amplitude versus the time. The results indicate that the RM instability induced by converging shock waves is different from that in planar shock case, which can be attributed to the convergence effects, such as the geometric convergence, the flow compressibility and the phase inversion.
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