An Experimental Study on a Blockage Effect of Sting-Free AxialCircular Cylinders

Hiroyuki Okuizumi, Yuki Wajima, Yasufumi Konishi, Hideo Sawada, Shigeru Obayashi, Naofumi Ohnishi

研究成果: ジャーナルへの寄稿学術論文査読

抄録

The correction of the blockage effect is crucial in wind tunnel experiments, particularly for the drag forces on bluff bodies with a large flow separation at the leading edge. Maskell’s wake blockage correction is a widely used method for bluff bodies. However, the correction method is limited to the separated flow that does not reattach. In this study, the blockage effect and correction methods were investigated due to the presence or absence of the leading-edge-separated shear layer reattachment in a flow field with non-support interference produced using a magnetic suspension and balance system (MSBS). The drag coefficient without a wall constraint ((Formula presented.)) was evaluated by varying the fineness ratio in the models with (Formula presented.) and (Formula presented.). For (Formula presented.), where the leading-edge-separated shear layer does not reattach, the solid blockage correction following the wake blockage correction reduced the difference to within (Formula presented.). However, as (Formula presented.) changed, the corrected drag coefficient was not constant. Further investigation is needed to evaluate the possibility of overcorrection. For (Formula presented.), the reattachment occurs; the wake blockage correction alone is insufficient; therefore, a solid blockage correction must apply along with the wake blockage correction. It leads the difference to become less than (Formula presented.) compared to (Formula presented.). The results of this study suggest that both wake and solid blockage corrections are effective regardless of the presence or absence of the reattachment of the leading-edge-separated shear layer on the cylinder.

本文言語英語
論文番号42
ジャーナルFluids
10
2
DOI
出版ステータス出版済み - 2025 2月

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