Experimental characterization of the interaction zone between counter-propagating Taylor Sedov blast waves
Experimental characterization of the interaction zone between counter-propagating Taylor Sedov blast waves
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DOI：
10.1063/1.5137795
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发表时间：
2020-02
影响因子：
2.2
通讯作者：
B. Albertazzi;P. Mabey;T. Michel;G. Rigon;J. Marquès;S. Pikuz;S. Ryazantsev;E. Falize;L. Van Box Som;J. Meinecke;N. Ozaki;Andrea Ciardi;G. Gregori;M. Koenig
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文献类型：
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作者：
B. Albertazzi;P. Mabey;T. Michel;G. Rigon;J. Marquès;S. Pikuz;S. Ryazantsev;E. Falize;L. Van Box Som;J. Meinecke;N. Ozaki;Andrea Ciardi;G. Gregori;M. Koenig
天文观测表明，冲击波和/或冲击波与天体物理物体（分子云、恒星、喷流风等）之间的相互作用，这是一个共同的过程，导致星际介质的结构更加复杂。特别是，当两颗孤立的大质量恒星相对较近并爆炸时，产生的超新星遗迹（SNRs）可以相互作用。撞击区呈现出迷人的复杂流体动力学物理，这取决于SNRs的年龄，它们的相对演化阶段以及两颗恒星之间的距离。在这封信中，我们实验研究的相互作用区域（IR）形成时，两个爆炸波（BW）碰撞在其泰勒-Sedov膨胀阶段。这两个波宽是由激光（1 ns，~ 500 J）照射直径为300 μm的碳棒产生的，并在不同气压和不同气体（Ar和N2）中传播。物理参数，如红外线的密度和温度，首次使用一套光学诊断（干涉测量，纹影，时间分辨光谱等）进行测量。这使我们能够精确地确定IR的热力学条件。发现压缩比r = 1.75，并且与单个冲击波的外壳相比，测量到温度增加17-20%。此外，我们观察到的涡旋的产生，诱导强的电子密度梯度，在IR在长时间的相互作用后。原则上，这可以通过比尔曼电池效应产生磁场。
Astronomical observations reveal that the interaction between shock waves and/or blast waves with astrophysical objects (molecular clouds, stars, jet winds, etc.) is a common process which leads to a more intricate structure of the interstellar medium. In particular, when two isolated massive stars are relatively close and explode, the resulting Supernovae Remnants (SNRs) can interact. The impact zone presents fascinating complex hydrodynamic physics which depends on the age of the SNRs, their relative evolution stage, and the distance between the two stars. In this Letter, we investigate experimentally the interaction region (IR) formed when two blast waves (BWs) collide during their Taylor-Sedov expansion phase. The two BWs are produced by the laser irradiation (1 ns, ∼500 J) of 300 μm diameter carbon rods and propagate in different gases (Ar and N2) at different pressures. The physical parameters, such as the density and temperature of the IR, are measured for the first time using a set of optical diagnostics (interferometry, schlieren, time-resolved optical spectroscopy, etc.). This allows us to determine precisely the thermodynamic conditions of the IR. A compression ratio of r ∼ 1.75 is found and a 17–20% increase in temperature is measured compared to the shell of a single blast wave. Moreover, we observe the generation of vorticity, inducing strong electron density gradients, in the IR at long periods after the interaction. This could in principle generate magnetic fields through the Biermann Battery effect.