Development of measurement system for micro-scale impact load in cavitation bubble collapse

空化气泡破裂微尺度冲击载荷测量系统的研制

• 批准号: 24656082
• 负责人: KISHIMOTO Kikuo
• 金额: $ 2.5万
• 依托单位: Tokyo Institute of Technology
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Challenging Exploratory Research
• 财政年份: 2012
• 资助国家: 日本
• 起止时间: 2012-04-01 至 2014-03-31
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-24656082/
• 关键词: 連続体力学; キャビテーション; 衝撃力; 逆問題解析; 材料力学・機械材料; 機械材料; 材料力学

When the cavitation occurs in turbo machinery and cavitation bubbles collapses inside the machinery, impact loading causes cavitation erosions. This study aims at developing the measurement system of the micro-scale impact load remotely by inverse analysis. Impact experiments due to bubble collapses initiated by electrical sparks under water were conducted at the bottom of the thick polycarbonate rod. The AE signals were measured at the top of the rod, 100 mm from the bottom. The bubble generation and collapsing were recorded by high-speed video camera. The impact forces are estimated by inverse analyses and the transfer function for estimating the impact forces was determined by the mechanical pencil lead press-breaking method. The impact forces estimated by the analyses revealed that the first loading was caused by the arrival of the shock wave due to the electric spark and the maxim loading was observed when the water jet in the bubble collapse reached at the bottom surface.

当涡轮机械发生空蚀，空泡在机械内部溃灭时，冲击载荷会引起空蚀。本研究旨在开发微尺度冲击载荷反分析远程测量系统。在聚碳酸酯粗棒底部进行了水下电火花引发气泡破裂的冲击实验。AE信号在杆的顶部测量，距离底部100 mm。用高速摄像机记录了气泡的产生和溃灭过程。采用逆分析法估算了冲击力，并利用铅笔芯压断法确定了估算冲击力的传递函数。通过分析估算的冲击力表明，第一次加载是由于电火花引起的冲击波的到达而引起的，当气泡破裂中的水射流到达底部表面时观察到最大加载。

项目成果

Frequency and dispersion of flexural waves in fluid-filled tubes subjected to axial impact

轴向冲击下充液管内弯曲波的频率和频散

• 发表时间: 2013
• 作者: K.Inaba;K.Takkahashi;K.Kishimoto
• 通讯作者: K.Kishimoto

管内の水中火花放電による気泡の生成・崩壊挙動

管道内水下火花放电气泡的产生和破裂行为

• 发表时间: 2013
• 作者: 三浦敏孝;因幡和晃;高橋航圭;岸本喜久雄
• 通讯作者: 岸本喜久雄

逆解析を利用した衝撃荷重計測システムの開発

利用逆分析开发冲击载荷测量系统

• 发表时间: 2012
• 作者: 清水孝吉;因幡和晃;高橋航圭;岸本喜久雄
• 通讯作者: 岸本喜久雄

Transient of Wave Propagation around a Large Particle in Pipes Filled with Water

充满水的管道中大颗粒周围波传播的瞬变

• 期刊: Applied Mechanics and Materials
• 作者: T. Hori;K. Inaba;K. Takahashi;K. Kishimoto
• 通讯作者: K. Kishimoto

Frequency and dispersion of flexural waves in fluid-filled tubes subject to axial impact

受轴向冲击的充液管中弯曲波的频率和频散

• 发表时间: 2013
• 作者: K. Inaba;K. Takahashi;K. Kishimoto
• 通讯作者: K. Kishimoto