Development of Cavitation Nuclei Distribution Measuring Equipment

空化核分布测量设备的研制

• 批准号: 60850033
• 负责人: MATSUMOTO Yoichiro
• 金额: $ 6.08万
• 依托单位: The University of Tokyo
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Developmental Scientific Research
• 财政年份: 1985
• 资助国家: 日本
• 起止时间: 1985 至 1986
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-60850033/
• 关键词: Cavitation; Nuclei distribution; Light scattering method; モンテカルロシミュレーション; 二焦点レーザ流速計; レビテーション

The cavitation nuclei distribution measuring equipment which has a high mobility has been developed. Cavitation nuclei are measured by a light scattering method. This equipment has the following feature: (1) Microbubbles are able to be distinguished from solid particles in the liquid. (2) Cavitation nuclei are measured directly in the liquid. (3) Measurement and data treatment can be done in real time.Preceding the development, the scattered light intensities are calculated using the Mie's theory. The collecting efficiency of the scattered light and the detected light intensity in the control volume are estimated in various alignments of optical parts. According to these calculations, the scattered light is detected from two directions ( <theta> , <phi> )=(90, <-!+> 15). The laser light incidents into the control volume from the direction of ( <theta> , <phi> )=(0,90), and the flow enters into the control volume from the direction of ( <theta> , <phi> )=(90,0). The light scattered from … More a microbubble is not detected correctly due to not only the nonuniformity of the light intensity but also the distorted image of the microbubble on the aperture. In order to estimate the accuracy of the system, a Monte Carlo simulation is employed, where the size of nuclei and the location within the control volume are determined randomly. This simulation reveals that 5000 data are required to obtain reliable data.The equipment is divided into four parts, i.e. light source, probe part which is installed in a cavitation tunnel, photo detector and data processor. The light source, the probe and the photo detector are connected by the optical fibers, which improved the mobility. The two detected lights from the microbubble are collected when the two signals observed at the same time. The collected two signals are compared each other and the signals are recognized as the scattered light from a microbubble only when the signals coincide within from 200% to 50%.The measuring system is tested in a cavitation tunnel and the reliability of the system is confirmed. Less

研制了一种高机动性的空化核分布测量装置。用光散射法测量了空化核。该装置具有以下特点：(1)能够将液体中的微泡与固体颗粒区分开来。(2)直接在液体中测量空化核。(3)可进行实时测量和数据处理，显影前采用米氏理论计算散射光强度。在光学部件的各种对准中估计散射光的收集效率和控制体中检测到的光强度。根据这些计算，从两个方向(&lt；theta&gt；，&lt；Phi&gt；)=(90，&lt；-！+&gt；15)检测散射光。激光从(&lt；theta&>t；，&lt；Phi&>t；)=(0，90)方向入射到控制体积中，并且水流从(&lt；theta&>t；，&lt；Phi&>t；)=(90，0)方向进入控制体积。来自…的散射光此外，由于光强的不均匀以及微气泡在孔径上的图像失真，无法正确检测到微气泡。为了估计系统的精度，采用了蒙特卡罗模拟，其中核的大小和控制体积内的位置是随机确定的。模拟结果表明，获得可靠的数据需要5000个数据，该设备分为光源、安装在空化风洞中的探头部分、光电探测器和数据处理器四个部分。光源、探头和光电探测器通过光纤连接，提高了移动性。当同时观测到两个信号时，采集来自微泡的两个被检测光。将采集到的两个信号进行比较，只有当信号重合度在200%~50%之间时，才能将信号识别为微气泡的散射光。较少

项目成果

キャビテーションに関するシンポジウム予稿集第4回. (1985)

第四届空化研讨会论文集（1985）。

松本洋一郎: キャビテーションと混相流に関するフォーラム-1987.

Yoichiro Matsumoto：空化和多相流论坛 - 1987。

Yoichiro MATSUMOTO: "CAVITATION NUCLEI DISTRIBUTION MEASURMENT BY LIGHT SCATTERING METHOD" 5TH CAVITATION SYMPOSIUM. (1987)

松本洋一郎：“光散射法空化核分布测量”第五届空化研讨会。

日本機械学会論文集. 51-472号. (1985)

日本机械工程师学会会刊第 51-472 号（1985 年）。

松本洋一郎: キャビテーションに関するシンポジウム(第5回).

松本洋一郎：空化研讨会（第五届）。