Item type |
デフォルトアイテムタイプ(フル)(1) |
公開日 |
2007-09-16 |
タイトル |
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タイトル |
はく離・再付着流れの非定常構造に関する実験的研究 |
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言語 |
ja |
タイトル |
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タイトル |
Experimental Study on Unsteady Stuctures in a Reattaching Separated Flow Field |
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言語 |
en |
作成者 |
照屋, 功
具志堅, 貴之
山里, 栄昭
伊良部, 邦夫
Teruya, Isao
Gushiken, Takayuki
Yamazato, Eisho
Irabu, Kunio
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アクセス権 |
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アクセス権 |
open access |
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アクセス権URI |
http://purl.org/coar/access_right/c_abf2 |
主題 |
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言語 |
en |
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主題Scheme |
Other |
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主題 |
Backward Facing Step |
主題 |
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言語 |
en |
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主題Scheme |
Other |
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主題 |
Separation |
主題 |
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言語 |
en |
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主題Scheme |
Other |
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主題 |
Reattachment |
主題 |
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言語 |
en |
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主題Scheme |
Other |
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主題 |
Unsteady Structure |
主題 |
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言語 |
en |
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主題Scheme |
Other |
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主題 |
Frequency Analysis |
内容記述 |
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内容記述タイプ |
Other |
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内容記述 |
Separated and reattaching flow fields observed in engineering equipments are extremely complex because of its unsteadiness and three-dimensional structure. It is well known that of organized large-scale vortical structures appear in the separated shear layer.\nThe purpose of this study is to explore experimentally the large-scale vortices in a separated and reattaching shear layer evolving from a backward facing step edge and to find the width of the free stream and the periodicity of motion of large-scale vortices.\nIn this investigation, the reattachment length of the shear layer was determined based on the measurements with a thermal-tuft probe. The wall pressure and the velocity fluctuations were measured with a pressure sensor and an I type hot wire probe respectively. Those data were analyzed by a FFT analyzer.\nThe obtained results are described as follows. (1) The reattachment length increases with the expansion ratio, W_2/W_1. When the distance X in the flow direction is normalized by the width of reattachment region ΔX_R, the forward flow fraction distributions at different expansion ratio, W_2/W_1, fall on one curve near the reattachment region. (2) According to analysis of the frequency of pressure fluctuations, the frequency of large-scale vortices is f・H/U_0=0.7, where H is height of the step. f is frequency and U_0 is velocity of the main flow. (3) the peak of power spectrum of the velocity fluctuations is f・H/U_0=0.3~0.5. |
内容記述 |
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内容記述タイプ |
Other |
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内容記述 |
紀要論文 |
出版者 |
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言語 |
ja |
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出版者 |
琉球大学工学部 |
言語 |
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言語 |
jpn |
資源タイプ |
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資源タイプ |
departmental bulletin paper |
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資源タイプ識別子 |
http://purl.org/coar/resource_type/c_6501 |
出版タイプ |
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出版タイプ |
VoR |
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出版タイプResource |
http://purl.org/coar/version/c_970fb48d4fbd8a85 |
識別子 |
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識別子 |
http://hdl.handle.net/20.500.12000/1998 |
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識別子タイプ |
HDL |
収録物識別子 |
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収録物識別子タイプ |
ISSN |
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収録物識別子 |
0389-102X |
収録物識別子 |
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収録物識別子タイプ |
NCID |
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収録物識別子 |
AN0025048X |
収録物名 |
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言語 |
ja |
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収録物名 |
琉球大学工学部紀要 |
書誌情報 |
号 44,
p. 13-20,
発行日 1992-09
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