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Evaluation Growing and Collapsing Behaviors of Cavitation Bubbles under Flowing Condition

机译：流动条件下空化气泡的生长和破裂行为的评价

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摘要

A liquid mercury target for the pulsed spallation neutron source has been in operation in the Japan Proton Accelerator Research Complex (J-PARC). Liquid mercury enclosure vessel made of stainless steel is damaged by the cavitation erosion induced by pressure waves that are generated by proton beam injection. A double-walled structure with a narrow channel in front of the mercury target vessel was adopted to the vessel for expecting to mitigate cavitation damage. In this study, we at first made clear of the mechanism of cavitation damage mitigation in narrow channel through visualizing the growing and collapsing behaviors of the spark-induced cavitation bubbles under flow field using a high-speed video camera. Furthermore, we measured the wall vibration due to the cavitation bubble collapse with parametrically changing flow velocity. While the microjet without flow collides perpendicularly with the wall, the microjet with flow collides with an inclined angle from the perpendicular. As the results, the collision pressure was found to be mitigated by flowing effect.
机译：脉冲散裂中子源的液态汞靶已在日本质子加速器研究中心（J-PARC）中运行。由质子束注入产生的压力波引起的空化腐蚀会损坏由不锈钢制成的液态汞封闭容器。预期在汞靶容器前面采用狭窄通道的双壁结构，以减轻气蚀损害。在本研究中，我们首先通过使用高速摄像机观察流场下火花诱发的气蚀气泡的生长和塌陷行为，从而弄清了狭窄通道中的气蚀损伤缓解机制。此外，我们测量了由于空泡破裂而导致的壁振动，并随参数改变了流速。当没有流动的微射流与壁垂直碰撞时，有流动的微射流与垂直方向以倾斜角度发生碰撞。结果，发现通过流动效果减轻了碰撞压力。

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