Mechanism of unsteady spray formations by shock wave and bubble formation induced by breakdown

冲击波形成不稳定喷雾的机制和破裂引起的气泡形成

• 批准号: 24656516
• 负责人: NAKAYA Shinji
• 金额: $ 2.58万
• 依托单位: The University of Tokyo
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for 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-24656516/
• 关键词: 微粒化; キャビテーション; レーザーブレイクダウン; 放電; 液体ジェット; 気泡崩壊; 推進・エンジン; 衝撃波; 二相流

An atomization process of water injected by a laser breakdown and an electrical spark discharge was investigated experimentally. Bubbles were formed by the laser irradiation with a convex lens and the electrical spark discharge in a vessel with optical windows, and the behavior of shock waves, bubble formations, bubble growths and collapses were observed using a high speed video camera. Water was injected from a nozzle. In the case of the laser breakdown, bubbles were formed along the laser path mainly at the upstream of the beam west. Bubble interactions were clearly observed, which affect the maximum radius and the bubble life time. Liquid thread injections were observed right after the laser breakdown. After a delay time of approximately 0.4 ms, a strong water jet was injected from the nozzle. In the case of the electrical discharge, bubble formations and water injections were also recognized although the injection was much weaker compared with that by the laser breakdown.

对水在激光击穿和电火花放电中的雾化过程进行了实验研究。在带光学窗口的容器中，用凸透镜激光照射和电火花放电形成气泡，用高速摄像机观察了冲击波、气泡形成、气泡生长和破裂的行为。水从喷嘴注入。在激光击穿的情况下，主要在光束西的上游沿激光路径沿着形成气泡。气泡的相互作用被清楚地观察到，这影响最大半径和气泡的寿命。在激光击穿后立即观察到液体线注入。在大约0.4ms的延迟时间之后，从喷嘴喷射强水射流。在放电的情况下，气泡的形成和水的注射也被确认，虽然注射是弱得多相比，由激光击穿。

项目成果

東京大学大学院工学系研究科航空宇宙工学専攻津江・中谷研究室

东京大学研究生院工学研究科航空宇宙工学科 Tsue-Nakatani 实验室

放電およびレーザブレイクダウンによる気泡および衝撃波生成による液体噴射と微粒化の観察

观察由于放电和激光击穿产生气泡和冲击波而导致的液体喷射和雾化

• 发表时间: 2013
• 作者: Tanaka;T.;田中 剛，竹内 誠，片岡達也;田中 剛，竹内 誠，片岡達也;田中 剛;堀江 顕，夏目 和人，中谷 辰爾，津江 光洋
• 通讯作者: 堀江 顕，夏目 和人，中谷 辰爾，津江 光洋

液体噴射装置および液体噴射方法

液体注入装置及液体注入方法

• 发表时间: 2013