航技研60cm磁力支持天秤装置を用いた球の抵抗測定 Sphere Drag Measurements with the NAL 60cm MSBS

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著者

    • 澤田 秀夫 SAWADA Hideo
    • 独立行政法人 航空宇宙技術研究所 流体科学研究センター 先進的風洞技術グループ Innovative Wind Tunnel Technology G., Fluid Science R. C., National Aerospace Laboratory of Japan
    • 国益 徹也 KUNIMASU Tetsuya
    • 独立行政法人 航空宇宙技術研究所 流体科学研究センター 先進的風洞技術グループ Innovative Wind Tunnel Technology G., Fluid Science R. C., National Aerospace Laboratory of Japan
    • 須田 信一 SUDA Shinichi
    • 独立行政法人 航空宇宙技術研究所 流体科学研究センター 先進的風洞技術グループ Innovative Wind Tunnel Technology G., Fluid Science R. C., National Aerospace Laboratory of Japan

抄録

Drag coefficients of a sphere were measured in support interference free by the NAL 60cm MSBS(Magnetic Suspension and Balance System) up to 3.5×10<sup>5</sup> in Reynolds number. The magnetically supported sphere moved a little around tunnel center during tests. The displacement parallel to the flow is about 1/4 times as small as perpendicular one. The displacement perpendicular to the flow was distributed uniformly in direction at speed of 20m/s.The obtained drag coefficients show almost the same values as the other source data sets using a MSBS. In unsteady aerodynamic force on the sphere, rms values of the side force were about 4 times as large as parallel one at speed of 35m/s. Two kinds of averaged side force were observed at Reynolds numbers not less than 2.5×10<sup>5</sup> while the same drag coefficient was measured. One increased rapidly with Reynolds number. The other keeps zero or very small magnitude as Reynolds number increases. Strouhal numbers were measured at three Reynolds numbers up to 2.8×10<sup>5</sup> and they show good agreement with ones in other sources.

収録刊行物

  • JWE : 日本風工学研究会誌

    JWE : 日本風工学研究会誌 (98), 129-136, 2004-01-31

    Japan Association for Wind Engineering

参考文献:  11件中 1-11件 を表示

被引用文献:  4件中 1-4件 を表示

各種コード

  • NII論文ID(NAID)
    10012129670
  • NII書誌ID(NCID)
    AN10072785
  • 本文言語コード
    JPN
  • 資料種別
    ART
  • ISSN
    09121935
  • NDL 記事登録ID
    6940938
  • NDL 雑誌分類
    ZN1(科学技術--建設工学・建設業)
  • NDL 請求記号
    Z16-B243
  • データ提供元
    CJP書誌  CJP引用  NDL  J-STAGE 
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