This research has investigated the above-mentioned process resulting in cavitation erosion step by step.

本研究逐步研究了上述导致空蚀的过程。

• 批准号: 09450372
• 负责人: KATO Hiroharu
• 金额: $ 9.02万
• 依托单位: The University of Tokyo
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (B)
• 财政年份: 1997
• 资助国家: 日本
• 起止时间: 1997 至 1998
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-09450372/
• 关键词: cavitation; Erosion; Prediction; Impact Pressure; Bubble Collapse; Sheet Cavitation; Cloud Cavitation; 壊食; クラウド; 気泡; 衝撃力; 蒸発; ホログラフィ

In terms of the total volume of sheet cavity, which turns into the total vapor volume of initial cloud cavity, it is necessary to know evaporation rate at the sheet cavity surface which is vapor/liquid interface. Thus, the evaporation rate at cavity surface has been predicted by measuring the temperature distribution along a sheet cavity generated in high temperature and high pressure water where the thermodynamic effect due to evaporation appears more clearly.Using a high speed video, the whole cavity behavior has been observed in detail. The frequency of cloud cavity shedding and the size and shape of the clouds have been measured. Also, a laser holography technique has been applied to measure the number and size of the bubbles in a could cavity.Cavitation impact force sensors developed and fabricated by ourselves have been used to measure the impactive forces due to collapse of cloud cavities. A high speed video has been taken at the same time with frame rate of 40,500 fps. Behavior of cloud cavity collapse has been investigated in detail with correlation to the time history of the impact force taken into account.

就板腔的总体积而言，即初始云腔的总蒸汽体积，需要知道板腔表面即汽/液界面处的蒸发速率。因此，通过测量在高温高压水中产生的片材型腔的温度分布，可以预测型腔表面的蒸发速率，其中蒸发引起的热力学效应显得更加清晰。使用高速视频，整个型腔的行为被详细观察。测量了云腔脱落的频率以及云的大小和形状。此外，还应用激光全息技术测量云腔内气泡的数量和大小。自行研制的空化冲击力传感器用于测量云腔塌陷产生的冲击力。同时拍摄了帧速率为 40,500 fps 的高速视频。已经详细研究了云腔塌陷的行为，并考虑了与冲击力的时间历史的相关性。

项目成果

Yasutaka Kawanami, Hiroharu Kato, Hajime Yamaguchi, Masatsugu Maeda: "Bubble Distribution in a Cloud Cavity" Proc.9th Symposium on Cavitation, Sendai, 1997. 131-134 (1997)

Yasutaka Kawanami、Hiroharu Kato、Hajime Yamaguchi、Masatsugu Maeda：“云腔中的气泡分布”Proc.9th Symposium on Cavitation，仙台，1997。131-134（1997）

Hiroharu Kato: "Complex Structure on Sheet-Cloud Cavitation" Proc.8rd Intern.Conf.on Pumps and Fans, Tsinghua University, Beijing. 1-12 (1998)

Hiroharu Kato：“片云空化的复杂结构”Proc.8rd Intern.Conf.on Pumps and Fans，清华大学，北京。

金野祥久,加藤洋治,他: "キャビテーション壊食量の推定法(第2報 : 気泡群崩壊による衝撃力頻度分布計測の信頼性評価)" 日本造船学会論文集. 184号. 15-26 (1998)

绀野义久、加藤洋二等：“气蚀量的推定方法（第2次报告：气泡群破裂的冲击力频率分布测量的可靠性评价）”日本造船学会会刊第184号。 15-26（1998）

Hiroharu Kato: "Complex Structure on Sheet-Cloud Cavitation" Proc.8rd Intern.Conf.on Pumps and Fans, Tsinghua University, Beijing. 1-12 (1998)

Hiroharu Kato：“片云空化的复杂结构”Proc.8rd Intern.Conf.on Pumps and Fans，清华大学，北京。

金野祥久, 加藤洋治, 他: "キャビテーション壊食量の推定法 (第2報:気泡群崩壊による衝撃力頻度分布計測の信頼性評価)" 日本造船学会論文集. 184号. 15-26 (1998)

绀野义久、加藤洋二等：“气蚀量的推算方法（第2次报告：气泡群破裂的冲击力频率分布测量的可靠性评价）”日本造船学会学报第184期15期。 -26 (1998)