2023 Fiscal Year Final Research Report
3D measurement of oil temperature distribution using LIF method and its appication to cavitation phenomena
| Project/Area Number |
21K03915
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Multi-year Fund |
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| Section | 一般 |
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| Review Section |
Basic Section 19020:Thermal engineering-related
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| Research Institution | University of Yamanashi |
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Principal Investigator |
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| Co-Investigator(Kenkyū-buntansha) |
坂間 清子 国立研究開発法人産業技術総合研究所, 情報・人間工学領域, 研究員 (70773539)
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| Project Period (FY) |
2021-04-01 – 2024-03-31
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| Keywords | LIF / 可視化計測 / 温度計測 |
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| Outline of Final Research Achievements |
In this study, we succeeded in visualizing and measuring the temperature rise phenomenon caused by acoustic cavitation in automotive transmission oil using a two-color LIF method for transmission oil originally developed using Pirromethene597, and confirmed that cavitation causes a local temperature rise in transmission oil. The measured temperature rise was about 10.5°C. However, the measured temperature rise of about 10.5°C was not significant. However, the measured temperature increase of approximately 10.0 °C cannot be said to be a factor affecting the physical properties of the transmission oil, and an estimate of the maximum temperature around bubbles due to bubble collapse has not yet been achieved.
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| Free Research Field |
Flow Visualization
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| Academic Significance and Societal Importance of the Research Achievements |
我が国におけるエネルギー消費量の70%超が産業、運輸部門における商品である。これらの部門では、建設機械を筆頭に、種々の油圧制御機構（油圧シリンダ、変速機など）が用いられており、これらサブシステムによるエネルギー損失は、機械駆動時のエネルギー損失の約70％に達する。このエネルギー損失の主要因の一つが、キャビテーションにおける気泡断熱圧縮による作動油の酸化劣化とラッカー（酸化縮合物）生成である。このキャビテーションならびに気泡断熱圧縮においては、気泡が崩壊する瞬間に微小な高温高圧領域が生じることが指摘されているが実測されておらず、この現象解明の意義は大きい。
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