段付き円柱まわりの流れ

概要

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This paper presents an experimental study on the flow around a stepped circular cylinder and the structure of the shedding vortices. The surface pressure distributions on the cylinder and the spectra of the wakes were measured for diameter ratios of 0.4 and 0.8. The main results are as follows. (1) The back pressures of the two stepped circular cylinders are higher than those of a straight circular cylinder. Therefore, the local pressure drag coefficients of the stepped cylinders are lower than those of the straight cylinder. (2) The structure of the shedding vortices is different between the diameter ratio of 0.4 and 0.8, being complex in the case of 0.4 and simple for 0.8. (3) In the case of 0.8, the signal representing the vortices can be expressed as a linear combination of two sine waves and the structure of the filaments obtained from it agrees with the result of a flow visualization.
社団法人日本機械学会の論文
1989-10-25