Development of Fluidics-Type Sprinkler to Remove the Fallen Volcanic Ash from Mt.Sakurajima

开发射流式洒水装置以清除樱岛火山灰

• 批准号: 05555062
• 负责人: NAKASHIMA Masahiro
• 金额: $ 2.37万
• 依托单位: KAGOSHIMA NATIONAL COLLEGE OF TECNOLOGY
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Developmental Scientific Research (B)
• 财政年份: 1993
• 资助国家: 日本
• 起止时间: 1993 至 1994
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-05555062/
• 关键词: Fluidics; Flow Visualization; Image Processing; Sprinkler; Volcanic Ash

As a part of the investigation on the device to remove the volcanic ash fallen on the sun-heat collector, new type of sprinklers applied the flow mechanism in the fluidic devices have been designed and developed. In this study, by using the video camera and the image processing system, the spread angle of the sprinkled water have been investigated. Moreover, the distribution of the sprinkled water have been measured quantitatively. Inthis investigation, the diameter of the air hole set in the developed sprinkler were changed variously. The obtained concludions in this study are as follows.(1) As the diameter of the air holes becomes large, the spread angle of the sprinkled water widens. However, at a certain diameter the spread angle has a maximum value, and then it lessens gradually.(2) The distributions of the sprinkled water change greatly with the diameter of the air hole. In the case of small diameter, water is distributed around the water jet center-line mainly and its distribution is shaped like a sharp edge cone. However, as the diameter increases the distribution of the sprinkled water changes into the saddle-shape one. The maximum depth of the sprinkled water shows at the outer edge of the water jet.(3) In order to estimate the distirbution of the sprinkled water quantitatively, the mean depth of the sprinkled water was introduced newly. As a result, the mean depth is large in the case that water distributes in the shape of cone. However, it becomes small according to the uniformity of the sprinkled water distribution.

作为太阳能集热器火山灰清除装置研究的一部分，应用射流装置中的流动机理，设计开发了新型喷头。本研究利用摄影机及影像处理系统，对洒水散布角进行研究。此外，还定量测量了喷洒水的分布。在本研究中，对所研制的喷头的气孔直径进行了不同程度的改变。本研究得到的结论如下。(1)随着空气孔的直径变大，喷洒的水的散布角度变宽。但在某一直径处，扩散角有一个最大值，然后逐渐减小。(2)空气孔直径的变化对喷淋水分布影响较大。在小直径情况下，水主要分布在射流中心线附近，呈锐边锥状分布。但随着管径的增大，喷淋水分布逐渐变为马鞍形分布。最大喷水深度出现在水射流的外缘。(3)为了定量地估计喷洒水的分布，新引入了平均喷洒水深度。结果表明，当水体呈锥形分布时，平均水深较大。然而，根据喷洒的水分布的均匀性，它变得很小。

项目成果

中島,正弘他3名: "流体論理素子の発振原理を応用した散水器の開発" 鹿児島工業高等専門学校研究報告. 29号. 15-20 (1994)

Nakajima、Masahiro 等 3 人：“应用流体逻辑元件振荡原理的喷水器的开发”鹿儿岛国立工业大学研究报告第 29. 15-20 号（1994 年）。

Masahiro NAKASHIMA,et, al.: "Development of Fallen Volcanic Ash Remover Applying the Flow mechanism of Fluidics" Research Reports of Kagosima National College of Technology. No.29. 15-20 (1994)

Masahiro NAKASHIMA等人：“利用流体流动机理开发火山灰清除器”鹿儿岛工业大学研究报告。

中島正弘 他3名: "流体論理素子の発振原理を応用した散水器の開発" 鹿児島工業高等専門学校研究報告. 29号. 15-20 (1994)

Masahiro Nakajima 等 3 人：“应用流体逻辑元件振荡原理的喷水器的开发”鹿儿岛国立工业大学研究报告第 29. 15-20 号（1994 年）。