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An Experimental Study on Side Flow Stabilization by using Stepped Nosed Method
https://jaxa.repo.nii.ac.jp/records/43580
https://jaxa.repo.nii.ac.jp/records/435809790dec3-d776-47e0-9bc1-bcc0dc456fda
| 名前 / ファイル | ライセンス | アクション |
|---|---|---|
nalsp0059008.pdf (1.1 MB)
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| Item type | テクニカルレポート / Technical Report(1) | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| 公開日 | 2015-03-26 | |||||||||
| タイトル | ||||||||||
| タイトル | An Experimental Study on Side Flow Stabilization by using Stepped Nosed Method | |||||||||
| 言語 | en | |||||||||
| 言語 | ||||||||||
| 言語 | eng | |||||||||
| 資源タイプ | ||||||||||
| 資源タイプ識別子 | http://purl.org/coar/resource_type/c_18gh | |||||||||
| 資源タイプ | technical report | |||||||||
| 著者 |
Cakrawala, Anang
× Cakrawala, Anang
× Umemura, Akira
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| 著者所属（英） | ||||||||||
| en | ||||||||||
| Nagoya University, Aerospace Engineering Department, Propulsion Lab. | ||||||||||
| 著者所属（英） | ||||||||||
| en | ||||||||||
| Nagoya University, Aerospace Engineering Department, Propulsion Lab. | ||||||||||
| 出版者 | ||||||||||
| 出版者 | 航空宇宙技術研究所 | |||||||||
| 出版者（英） | ||||||||||
| 出版者 | National Aerospace Laboratory(NAL) | |||||||||
| 書誌情報 |
独立行政法人航空宇宙技術研究所特別資料 en : Special Publication of National Aerospace Laboratory SP-59 巻 59, p. 4, 発行日 2003-06 |
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| 抄録（英） | ||||||||||
| 内容記述タイプ | Other | |||||||||
| 内容記述 | Experimental study on fluid flow characteristics around step obstacle at angle of attack zero were carried out for Reynolds number in the range 0.5x10^5 to 1.5 10^5. Previous experiment study shows optimum stepped configuration obtains for some case of step height. In order to understand the structure of fluid flow around optimum configuration of the stepped nosed obstacle, we has been carry out an experimental study by using stepped nosed model result in various step height and stepped length. A small rectangular attached to a square cylinder, which is configure various stepped nosed obstacle, reduced the drag coefficient significantly. The underlying physics are that (1) the vortices trapped in the step regions produce the thrust forces acting on the step surfaces facing against the uniform stream which cancel the drag force acting on the front surface of the stepped nose obstacle and that (2) the tangent reattachment of the flow separating from the front surface edges to the side surfaces of the main body decreases the suction pressure acting on the back surface of the main body. In the present study, we would like to clarify the flow structure at the optimum stepped configuration. The optimum stepped configuration means the stepped nosed obstacle with minimum drag force. It is also examine the effect of Reynolds number for optimum stepped configuration. This paper describe experimental result on the optimum stepped configuration include the following: A. Stepped obstacle drag coefficient map. B. Surface pressure distribution C. Flow visualization D. Strouhal number measurement Experimental results shows there is no significant Reynolds number effect in case Re between 0.5 10^5 ～ 1.5 10^5. Since Separation on bluff body such as stepped nosed obstacle occurs directly from the both front corner. The flow on side surface of the stepped obstacle shows stable, low turbulence intensity and almost attach to side surface of the obstacle. This condition result to narrow wakes and increase Strouhal number. | |||||||||
| ISSN | ||||||||||
| 収録物識別子タイプ | ISSN | |||||||||
| 収録物識別子 | 1347-457X | |||||||||
| 書誌レコードID | ||||||||||
| 収録物識別子タイプ | NCID | |||||||||
| 収録物識別子 | AN10097345 | |||||||||
| 資料番号 | ||||||||||
| 内容記述タイプ | Other | |||||||||
| 内容記述 | 資料番号: NALSP0059008 | |||||||||
| レポート番号 | ||||||||||
| 内容記述タイプ | Other | |||||||||
| 内容記述 | レポート番号: NAL SP-59 | |||||||||
