驻激波阻止超音速爆炸流中火花的传播
Standing shock prevents propagation of sparks in supersonic explosive flows
摘要：
火山喷流在爆炸性喷发中发出射频信号，表明其流体动力学和静电条件。这些放射物来自于由喷出的带电火山粒子形成的电场支持的火花。当冲击波定义的低压区域限制火花时，签名可能仅限于对应于雪崩流光领导人层次结构的早期组件的高频内容。在这里，我们的形象火花和一个站立的冲击一起在一个短暂的超音速射流的微型金刚石夹带在氩气。实验的流体动力学和动力学模拟表明，观察到的火花起源于上游的驻波。火花在稀疏区产生，并在冲击时被切断，这将把它们的射频发射限制在一个能说明问题的高频区域。我们表明，火花传输的爆炸流的印象，并开辟了新的仪器来诊断目前无法访问的爆炸现象的方式。
英文摘要：
Volcanic jet flows in explosive eruptions emit radio frequency signatures, indicative of their fluid dynamic and electrostatic conditions. The emissions originate from sparks supported by an electric field built up by the ejected charged volcanic particles. When shock-defined, low-pressure regions confine the sparks, the signatures may be limited to high-frequency content corresponding to the early components of the avalanche-streamer-leader hierarchy. Here, we image sparks and a standing shock together in a transient supersonic jet of micro-diamonds entrained in argon. Fluid dynamic and kinetic simulations of the experiment demonstrate that the observed sparks originate upstream of the standing shock. The sparks are initiated in the rarefaction region, and cut off at the shock, which would limit their radio frequency emissions to a tell-tale high-frequency regime. We show that sparks transmit an impression of the explosive flow, and open the way for novel instrumentation to diagnose currently inaccessible explosive phenomena.
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