An Investigation of the Flow around a Permeable Three-dimensional Body on the Plate(3rd Report, The Variation of Velocity Profile and the Vortex Shedding)

平面上に置かれた透過性三次元物体周りの流れに関する研究(第三報 速度分布の変化と渦放出)

An Investigation of the Flow around a Permeable Three-dimensional Body on the Plate(3rd Report, The Variation of Velocity Profile and the Vortex Shedding)

Creators Yamada Hidemi

Creators Furuya Masahiro

Creators Osaka Hideo

Creators Kageyama Yoshiro

Measurements were made of the velocity vectors and the power spectra around the permeable wall cube placed in the turbulent boundary layer. The aim was to investigate the effects of the open area ratio of cube and the boundary layer characteristics on both the mean velocity field and the aspects of the vortex-shedding. The range of open area ratio for which the separation bubble attaches to the permeable wall cube, was smaller in the case of the thin boundary layer thickness than the thick one. The research of the peak spectrum at a prominent frequency, its value in the power spectra and the flow visualization using the smoke wire method, clarified the structure of the vortex shedding from the permeable wall cube. The vortex-shedding frequency was independent of the value of open area ratio for each boundary layer, but the values of the power spectrum at the shedding frequency were different in the various positions around the cube.

[ISSN]0372-7661

[NCID]AN00244228