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首页> 外文学位 >Shock interaction with a two-gas interface in a novel dual-driver shock tube.
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Shock interaction with a two-gas interface in a novel dual-driver shock tube.

机译：新型双驱动器减震管中具有两气接口的减震相互作用。

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摘要

Fluid instabilities exist at the interface between two fluids having different densities if the flow velocity and density gradient are anti-parallel or if a shock wave crosses the boundary. The former case is called the Rayleigh-Taylor (R-T) instability and the latter, the Richtmyer-Meshkov (R-M) instability. Small initial perturbations on the interface destabilize and grow into larger amplitude structures leading to turbulent mixing. Instabilities of this type are seen in inertial confinement fusion (ICF) experiments, laser produced plasmas, supernova explosions, and detonations.; A novel dual-driver shock tube was used to investigate the growth rate of the R-M instability. One driver is used to create an argon-refrigerant interface, and the other at the opposite end of the driven section generates a shock to force the interface with compressible flows behind the shock. The refrigerant gas in the first driver is seeded with sub-micron oil droplets for visualization of the interface. The interface travels down the driven section past the test section for a fixed amount of time. A stronger shock of Mach 1.1 to 1.3 drives the interface back past the test section where flow diagnostics are positioned. Two schlieren systems record the density fluctuations while light scattering detectors record the density of the refrigerant as a function of position over the interface. A pair of digital cameras take stereo images of the interface, as mapped out by the tracer particles under illumination by a Q-switched ruby laser. The amount of time that the interface is allowed to travel up the driven section determines the interaction time as a control. Comparisons made between the schlieren signals, light scattering detector outputs, and the images quantify the fingered characteristics of the interface and its growth due to shock forcing. The results show that the interface has a distribution of thickness and that the interaction with a shock further broadens the interface. The growth rate was found to exhibit a dependence on the shock strength.
机译：如果流速和密度梯度是反平行的，或者如果冲击波越过边界，则在具有不同密度的两种流体之间的界面处会存在流体不稳定性。前者称为瑞利-泰勒（R-T）不稳定，后者称为Richtmyer-Meshkov（R-M）不稳定。界面上的小初始扰动会破坏稳定并增长为更大的振幅结构，从而导致湍流混合。在惯性约束聚变（ICF）实验，激光产生的等离子体，超新星爆炸和爆炸中可以看到这种类型的不稳定性。一种新型的双驱动冲击管用于研究R-M不稳定性的增长率。一个驱动器用于创建氩气-制冷剂界面，而另一个驱动器则在从动部分的另一端产生冲击，以迫使具有可压缩流的接口进入冲击。在第一个驱动器中的制冷剂气体中注入了亚微米油滴，用于界面可视化。接口在从动部分向下经过测试部分一定的时间。 1.1至1.3马赫的强烈冲击使接口返回经过流诊断所在的测试区域。两个schlieren系统记录密度波动，而光散射检测器记录制冷剂的密度随界面位置的变化。一对数码相机拍摄界面的立体图像，该图像由示踪剂粒子在调Q的红宝石激光器照射下绘制出来。允许界面向上移动到驱动部分的时间决定了交互时间作为控件。 schlieren信号，光散射检测器输出和图像之间的比较可量化界面的指状特性及其由于冲击力而产生的增长。结果表明，界面具有厚度分布，并且与冲击的相互作用进一步拓宽了界面。发现生长速率表现出对冲击强度的依赖性。

著录项

  • 作者

    Labenski, John R.;

  • 作者单位

    Lehigh University.;

  • 授予单位 Lehigh University.;
  • 学科 Physics Fluid and Plasma.
  • 学位 Ph.D.
  • 年度 2005
  • 页码 173 p.
  • 总页数 173
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 等离子体物理学;
  • 关键词

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