| Project/Area Number |
21760126
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| Research Category |
Grant-in-Aid for Young Scientists (B)
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| Allocation Type | Single-year Grants |
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| Research Field |
Fluid engineering
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| Research Institution | Nagoya Institute of Technology |
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Principal Investigator |
TAMANO Shinji Nagoya Institute of Technology, 大学院・工学研究科, 助教 (40345947)
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| Project Period (FY) |
2009 – 2010
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| Project Status |
Completed (Fiscal Year 2010)
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| Budget Amount *help |
¥4,420,000 (Direct Cost: ¥3,400,000、Indirect Cost: ¥1,020,000)
Fiscal Year 2010: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Fiscal Year 2009: ¥3,120,000 (Direct Cost: ¥2,400,000、Indirect Cost: ¥720,000)
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| Keywords | 流体工学 / 抵抗低減 / 乱流境界層 / 界面活性剤 / 可視化観察 / LDV計測 / 濃度分布 / 速度場計測 / トラバースシステム |
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| Research Abstract |
In this study, first a slot injection system of surfactant solution was constructed. Next, the flow visualization and LDV measurements were performed in the flat-plate turbulent boundary layer flow with water or surfactant solution injection from the wall, in order to clarify the mechanism of drag reduction. It is found that in the case of surfactant solution injection, layered-structures parallel to the wall developed in the streamwise direction, and the wall-normal turbulence near the wall is strongly attenuated. Moreover, in both cases of homogeneous and heterogeneous (injected) surfactant solutions mean velocities scaled by the friction velocity are well arranged by the amount of the drag reduction, in which the mean velocity increases with the increase in the drag reduction ratio.
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