Abstract

The results of photon Doppler velocimetry of ejecta from shock-loaded metal samples are reported. The experiments have been performed with tin and lead samples of a given thickness and a given surface roughness. The direct numerical simulation of the process of mass ejection from the surface of shock-loaded samples is performed for conditions close to experimental by the smoothed particle hydrodynamics method. The areal density and initial velocity distribution of the volume density of ejecta are determined. Using these results, we calculate the time dependence of the profile of the volume density at the expansion of the formed dust cloud to air. Applying an approach based on the transport equation for the correlation function of the scattered field, the main parameters of the velocity distribution of ejecta, areal density of ejecta, etc. are reconstructed from spectral photon Doppler velocimetry data. The experimentally observed temporal dynamics of spectra, which is caused by the drag of dust in air, is described at an appropriately chosen size dispersion of dust particles. The masses of ejecta reconstructed from experimental data are in agreement with the smoothed particle hydrodynamics results.

中文翻译：

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光子多普勒测速和激波加载样品表面的粒子喷射模拟

摘要

报道了冲击加载的金属样品的喷射光子多普勒测速的结果。实验是使用给定厚度和给定表面粗糙度的锡和铅样品进行的。通过平滑粒子流体动力学方法，在接近实验条件下，对冲击载荷样品表面的质量喷射过程​​进行了直接数值模拟。确定面密度和排出物的体积密度的初始速度分布。使用这些结果，我们计算了在形成的尘云向空气膨胀时体积密度分布的时间依赖性。应用基于输运方程的散射场相关函数，射流速度分布的主要参数，射流面密度的主要参数等方法。从光谱光子多普勒测速数据重建。其通过的空气中的灰尘的阻力引起的光谱，所述的实验观察时间动态，在灰尘颗粒的适当选择的尺寸的分散说明。从实验数据重建的射流质量与平滑粒子流体动力学结果一致。