Singular Behavior of Critical Reynolds Number Rec within the Working Section of Cavitation Tunnel When the Blockage Factor Is Extremely Large.
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概要
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In order to clarify the wall effects upon <I>Re<SUB>c</SUB></I>so often observed in valve experiments, we take up a simple flow around a circular cylinder of diameter <I>d</I> set within a two-dimensional channel of hight <I>h</I>, when the blockage factor <I>B</I>=<I>d</I>/<I>h</I>=0.75. And systematical measurements are made for the upstream-and the downstream-velocity distribution around the cylinder, by means of an PIV-technique, resulting in time-averaged nondimensional velocity change Δ<I>u</I>/<I>u</I><SUB>1</SUB>, in proportion to the drag coefficient with respect to Reynolds number <I>Re</I>. In the present case of extremely high <I>B</I>-<I>Re<SUB>c</SUB></I> is unexpectedly reduced about one figure than the small <I>B</I>-counterparts.
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