2013 Fiscal Year Final Research Report
Mechanism of unsteady spray formations by shock wave and bubble formation induced by breakdown
| Project/Area Number |
24656516
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| Research Category |
Grant-in-Aid for Challenging Exploratory Research
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| Allocation Type | Single-year Grants |
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| Research Field |
Aerospace engineering
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| Research Institution | The University of Tokyo |
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Principal Investigator |
NAKAYA Shinji 東京大学, 工学(系)研究科(研究院), 准教授 (00382234)
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| Co-Investigator(Renkei-kenkyūsha) |
TSUE Mitsuhiro 東京大学, 工学系研究科, 教授 (50227360)
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| Project Period (FY) |
2012-04-01 – 2014-03-31
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| Keywords | 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 |
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| Research Abstract |
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.
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