用于laser等离子体实验的对称和非对称冲击气体射流
Symmetric and asymmetric shocked gas jets for laser-plasma experiments
摘要：
超音速流中的激波提供了高密度和急剧的密度梯度，例如，可用于激光等离子体加速器中的梯度注入。我们报告的参数研究的斜激波插入一个直的轴对称部分在超音速“拉瓦尔”喷嘴的末端。通过计算流体动力学（CFD）模拟研究了不同参数（如喉部直径和直段长度）的影响。冲击喷嘴的实验特性进行了比较，CFD模拟，发现是在良好的协议。然后，我们介绍了一种新设计的非对称冲击气体射流，其中直线部分只存在于喷嘴的一侧，从而提供了一个气体轮廓，可用于密度过渡注射。在这种情况下，全三维流体模拟和实验测量进行了比较，并显示出良好的协议。
英文摘要：
Shocks in supersonic flows offer both a high-density and sharp density gradients that can be used, for instance,for gradient injection in laser-plasma accelerators. We report on a parametric study of oblique shocks created by inserting a straight axisymmetric section at the end of a supersonic "de Laval" nozzle. The impact of different parameters such as throat diameter and straight section length is studied through computational fluid dynamics (CFD) simulations. Experimental characterizations of a shocked nozzle are compared to CFD simulations and found to be in good agreement. We then introduce a newly designed asymmetric shocked gas jet, where the straight section is only present on one lateral side of the nozzle, thus providing a gas profile that can be used for density transition injection. In this case, full-3D fluid simulations and experimental measurements are compared and show excellent agreement.
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