Study on the bubble sound induced by the impact of a water drop on a liquid surface and exploration of possibility of sound control

水滴撞击液面产生气泡声的研究及声控可能性探索

• 批准号: 14550135
• 负责人: TOMITA Yukio
• 金额: $ 2.37万
• 依托单位: Hokkaido University of Education
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 2002
• 资助国家: 日本
• 起止时间: 2002 至 2003
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-14550135/
• 关键词: Water Droplet; Air Bubble; Bubble Sound; Splash; Instability; Capillary Wave; Suikinkutsu; 液体ジェット; 水面変形; 分裂

By changing the drop diameter d_D and dropping height H (i.e.impact velocity V_<imp>), we investigated the surface deformation and air bubble formation induced by the impact of a water drop on a water surface. A detailed experiment was carried out for the irregular bubble entrainment region which is closely related to the sound condition of Suikinkutsu. The results are summarized in the followings.(1)In the irregular bubble entrainment region, we found three types of mechanisms for air bubble formations. Especially available sounds are caused by the oscillation of air bubbles generated by the following mechanisms. The first one is the case where an air bubble is generated by the impact of a satellite droplet with a rising water surface. The second pattern of air bubble formation is associated with the surface closure during the falling process of the water column.(2)Even in the irregular bubble entrainment legion, there is some area of the (d_D-V_<imp>) condition where an air bubble is regularly entrained due to the impact of a satellite drop with the rising bottom of the cavity surface. On the other hand, during the falling process of the water column air bubbles can be generated randomly, resulting in a variety of underwater sounds. These sounds often have a wide range of frequencies.

通过改变水滴的直径d_D和高度H（即撞击速度V_<imp>），研究了水滴撞击水面引起的表面变形和气泡的形成。对与水金橘声条件密切相关的不规则气泡卷吸区域进行了详细的实验研究。结果总结如下。(1)In在不规则气泡卷吸区，我们发现了三种气泡形成机制。特别有用的声音是由以下机制产生的气泡振荡引起的。第一种是由卫星液滴与上升的水面的撞击产生气泡的情况。气泡形成的第二种模式与水柱下降过程中的表面闭合有关。（2）即使在不规则气泡卷吸群中，也存在（d_D-V_）条件的区域<imp>，在该区域中，由于卫星液滴与空腔表面的上升底部的碰撞，气泡被规则地卷吸。另一方面，在水柱下落的过程中，气泡会随机产生，从而产生各种各样的水下声音。这些声音通常具有很宽的频率范围。

项目成果

冨田 幸雄: "水滴の水面衝突による空気泡の取り込みと気泡音の発生機構"日本機械学会流体工学部門講演会講演概要集. No.03-16. 15-15 (2003)

富田幸男：“由于水滴与水面碰撞而产生气泡和气泡声音的机制”日本机械工程师学会流体工程学分会讲座摘要第 03-15 号（2003 年）。

Y.Tomita et al.: "The sound induced by irregular bubble entrainment following drop impact on a water surface (in Japanese)"Proceedings of the 52^<nd> National Congress of Theoretical & Applied Mechanics 2003. 345-346 (2003)

Y.Tomita 等：“水滴撞击水面后不规则气泡夹带引起的声音（日语）”第 52 届全国理论大会论文集

葛西 敏靖: "水琴窟の音発生に関する基礎研究-第2報 気泡の取り込み条件-"日本産業技術教育学会北海道支部研究論文集. 16. (2003)

Toshiyasu Kasai：“水琴窟中声音产生的基础研究 - 第 2 部分：气泡捕获条件 -”日本工业技术教育协会北海道分会研究论文 16。（2003 年）。

Y.Tomita et al.: "Bubble entrainment and induced sounds by drop impact on a water surface (in Japanese)"Abstracts of the 81^<st> JSME Fluids Engineering Conference 2003. No.03-16. 15 (2003)

Y.Tomita 等人：“气泡夹带和水滴撞击水面引起的声音（日语）”2003 年第 81 届 JSME 流体工程会议摘要。No.03-16。

冨田幸雄: "水柱の落下に伴う空気泡の形成と気泡音の発生"日本機械学会2004年度年次大会講演論文集. 発表予定. (2004)

富田幸雄：“气泡的形成和落下的水柱产生气泡噪音”日本机械工程师学会 2004 年年会会议记录（2004 年）。