2021 Fiscal Year Final Research Report
Basic study on shock waves with extreme pressure in supercritical fluids generated by pulsed arc discharge
| Project/Area Number |
19K14966
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| Research Category |
Grant-in-Aid for Early-Career Scientists
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| Allocation Type | Multi-year Fund |
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| Review Section |
Basic Section 21010:Power engineering-related
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| Research Institution | Nagasaki University |
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Principal Investigator |
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| Project Period (FY) |
2019-04-01 – 2022-03-31
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| Keywords | 超臨界流体 / パルスアーク放電 |
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| Outline of Final Research Achievements |
Shock waves are a very useful technology used in water purification and recycling. On the other hand, supercritical fluids have a wide range of applications, including extraction, decomposition, and cleaning; however, there are few studies of shock wave applications. The generation of shock waves in supercritical fluids by pulsed power has the potential to expand the range of applications. In this study, we visualized shock waves in supercritical carbon dioxide using a laser generated by pulsed discharge plasma. The structure and Mach number characteristics of the shock wave were clarified from the observation results.
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| Free Research Field |
パルスパワー工学
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| Academic Significance and Societal Importance of the Research Achievements |
本研究により超臨界二酸化炭素中の衝撃波のマッハ数（衝撃波の流れの速さと音速との比）が超臨界流体の臨界点近傍で極大値をもつことが明らかになった．マッハ数が極大値をもつことは，瞬間的・局所的に高圧力であり大きな密度差を発生させることができるという点において，既存の技術，例えば超臨界二酸化炭素抽出等の技術の改善・超臨界流体中衝撃波の新たな応用技術に繋がると考えられる．
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