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Radiation of Spalled Particles in Shock Layers

机译:冲击层中散落颗粒的辐射

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The behavior of solid particles ejected into a shock layer from an ablating carbonaceous heat shield is investigated theoretically in order to explain the results of an experiment conducted in an arc-jet facility. The experiment found that a laser beam made to pass through the shock layer over an ablating flat-faced model is attenuated in the shock layer. The likely cause of the attenuation is the presence of solid carbon particles due to spallation. The equation of motion of the solid particles, accounting for their vaporization, is integrated for different combinations of size and ejection velocity. The assumed quantity of ejected particles and the distributions of the size and ejection velocity are varied until the calculated pattern of laser-beam attenuation matched the experimental data. The radiative heat flux reaching the wall is calculated to be up to 170 W/cm~2 in the arc-jet experiment. If this phenomenon occurs also during the entry flight of the Stardust vehicle, the wall-heating rates are predicted to be up to 8% greater than without radiating carbon particles in the shock layer.
机译:从理论上研究了从烧蚀的碳质隔热屏喷射到冲击层中的固体颗粒的行为,以解释在电弧喷射设备中进行的实验结果。实验发现,穿过消融平面模型上的激波层的激光束在激波层中被衰减。衰减的可能原因是由于散裂而存在固体碳颗粒。固体颗粒的运动方程(考虑了它们的汽化)针对大小和喷射速度的不同组合进行了积分。改变假定的喷射粒子数量以及尺寸和喷射速度的分布,直到计算出的激光束衰减模式与实验数据匹配为止。在电弧喷射实验中,计算得出到达壁的辐射热通量高达170 W / cm〜2。如果在星尘飞行器的进场飞行中也出现这种现象,则预测的壁加热速率将比不向防震层辐射碳颗粒的情况下高出8%。

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