Fast-framing Focusing Schlieren Visualization of Two-dimensional Wing Buffet
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- YAMAGUCHI Shingo
- 岡山大学大学院自然科学研究科
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- KOUCHI Toshinori
- 岡山大学大学院自然科学研究科
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- KOIKE Shunsuke
- 宇宙航空研究開発機構
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- NAKAJIMA Tsutomu
- 宇宙航空研究開発機構
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- SATO Mamoru
- 宇宙航空研究開発機構
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- KANDA Hiroshi
- 宇宙航空研究開発機構
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- YANASE Shinichiro
- 岡山大学大学院自然科学研究科
Bibliographic Information
- Other Title
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- 高速断層シュリーレンによる二次元翼バフェットの可視化
- コウソク ダンソウ シュリーレン ニ ヨル ニジゲンヨク バフェット ノ カシカ
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Abstract
We visualized two-dimensional wing buffet using fast-framing focusing schlieren method. A supercritical airfoil of NASA SC(2)-0518 was used in this study. Mach number of the freestream was 0.7, and Reynolds number based on the wing code (c) was 5×106. Angle of attack without corrections (α) was changed from 4° to 6°. The present focusing schlieren system had ±18mm depth of field, which was narrow than spanwise region where the two-dimensionality of the flow field was maintained. 8,345 successive images were captured by high speed CMOS camera with 7,000 frames per second with 20μs exposure time. The present imaging system well captured the shock wave motion on the airfoil. At α = 4°, the shock wave was positioned at x/c∼0.45. The shock wave was slightly fluctuated with a frequency of 585.5Hz. Above α = 5°, the wing buffet occurred. The buffet frequency increased as increasing α. The focusing schlieren movies revealed that the shock wave was bifurcated on the wing surface, as the shock traveling upstream. The boundary layer largely separated from the leading oblique foot of the bifurcated shock wave, whereas, the bifurcated shock wave changed into a normal shock and the flow separation disappeared, as the shock traveling downstream. For both cases, many pressure waves propagated from the downstream of the shock wave to the upstream. These waves merged with the shock wave, and seem to drive the shock oscillation.
Journal
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- JOURNAL OF THE JAPAN SOCIETY FOR AERONAUTICAL AND SPACE SCIENCES
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JOURNAL OF THE JAPAN SOCIETY FOR AERONAUTICAL AND SPACE SCIENCES 63 (4), 166-174, 2015
THE JAPAN SOCIETY FOR AERONAUTICAL AND SPACE SCIENCES
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Details 詳細情報について
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- CRID
- 1390001204468519680
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- NII Article ID
- 130005090514
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- NII Book ID
- AA11307372
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- ISSN
- 24323691
- 13446460
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- NDL BIB ID
- 026648069
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- Text Lang
- ja
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- Data Source
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- JaLC
- IRDB
- NDL
- Crossref
- CiNii Articles
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- Abstract License Flag
- Disallowed