Influences of distributed surface roughness of small roughness-Reynolds-number on boundary-layer instability and transition
| Project/Area Number |
24560974
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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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| Research Field |
Aerospace engineering
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| Research Institution | Tokyo Metropolitan University |
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Principal Investigator |
ASAI Masahito 首都大学東京, システムデザイン研究科, 教授 (00117988)
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| Co-Investigator(Kenkyū-buntansha) |
INASAWA Ayumu 首都大学東京, システムデザイン研究科, 准教授 (70404936)
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| Project Period (FY) |
2012-04-01 – 2015-03-31
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| Project Status |
Completed (Fiscal Year 2014)
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| Budget Amount *help |
¥5,330,000 (Direct Cost: ¥4,100,000、Indirect Cost: ¥1,230,000)
Fiscal Year 2014: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000)
Fiscal Year 2013: ¥1,950,000 (Direct Cost: ¥1,500,000、Indirect Cost: ¥450,000)
Fiscal Year 2012: ¥2,210,000 (Direct Cost: ¥1,700,000、Indirect Cost: ¥510,000)
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| Keywords | 流れの安定性 / 壁面粗さ / 境界層 / 乱流遷移 / 流れの不安定性 / T-S波動 / 壁面粗度 / 平面ポアズイユ流 |
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| Outline of Final Research Achievements |
Influences of distributed surface roughness on boundary-layer instability and transition were examined experimentally by using simple corrugation models of sinusoidal geometry with various corrugation amplitudes and wavelengths. In contrast to strong destabilizing effect of 2-D corrugation, 3-D corrugation had only a small influence on the boundary-layer instability. The distinct difference in the influence of 2-D and 3-D corrugations on the boundary-layer instability was further clarified for oblique surface corrugations. Influences of surface imperfection of small step-size were also demonstrated through numerical simulations and experiments.
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Report
(4 results)
Research Products
(9 results)
