Effect of counter shock wave on the expanding plume
Effect of counter shock wave on the expanding plume
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反冲击波对膨胀羽流的影响
DOI：
10.1007/s00339-018-1577-6
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发表时间：
2018
期刊：
影响因子：
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通讯作者：
Ikurou Umezu
中科院分区：
文献类型：
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作者：
Keita Katayama; Yuki Horai;Hiroshi Fukuoka;Toshiki Kinoshita ;Takehito Yoshida ;Tamao Aoki ;Ikurou Umezu
通过对两束激光烧蚀羽流膨胀动力学的观测，揭示了在背景气体中头部碰撞对两束激光烧蚀羽流的影响。将Nb_2O_5和Ni靶平行放置，在不同气压的He气体中用两束YAG激光同时照射。羽流膨胀动力学监测门ICCD相机。两个烟羽碰撞后，烟羽停滞在500 Pa。在2000 Pa以上，即使羽流彼此不碰撞，也可以观察到羽流的向后运动。我们用点爆炸模型估算了激波阵面的传播，结果表明，在高背景气压下的后移是由于羽流与激波阵面的碰撞造成的。这些结果表明，与反激波的碰撞对羽流膨胀动力学是非常重要的。
Effects of head on collision on two laser ablation plumes in background gas are revealed by observation of plume expansion dynamics. Nb2O5and Ni targets were set parallel to each other and irradiated simultaneously by two YAG lasers in He gas under various gas pressures. The plume expansion dynamics was monitored by a gated ICCD camera. The plumes stagnate at 500 Pa after collision of two plumes. The backward movements of the plumes are observed above 2000 Pa, even though the plumes do not collide with each other. We estimated propagation of shock front by point blast model and the results indicate that the backward movement at high background gas pressure is due to the collision between plume and shock front. These results indicate that collision with counter shock wave is very important for plume expansion dynamics.