29th IAHR Symposium on Hydraulic Machinery and Systems | |
Numerical study on the flow in balancing hole | |
Matsui, Jun^1 ; Okubo, Atsushi^1 ; Yamashita, Yousuke^1 | |
Yokohama National University, Tokiwadai 79-5, Hodogaya-ku, Yokhama, Japan^1 | |
关键词: CFD simulations; Discharge coefficients; Flow situation; Rotating speed; Rotational speed; S-shaped; | |
Others : https://iopscience.iop.org/article/10.1088/1755-1315/240/2/022002/pdf DOI : 10.1088/1755-1315/240/2/022002 |
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来源: IOP | |
【 摘 要 】
In order to investigate the value of discharge coefficient of balancing hole Cd for wide range of axial flow velocity v in the hole and rotational speed u, series of CFD simulations are made. Some of the result agrees well with the existing experimental data, but the difference is about 20% in some cases with high Rev. Also, for wide area of Rev, the effect of rotating speed u becomes significant. So it is considered that the parameter v/u is a dominant indicator of Cd. Furthermore, for very low range of v/u, we found a rare flow situation with S-shaped streamlines. In this flow, pumping of disk is so strong and Cd may differ largely.
【 预 览 】
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Numerical study on the flow in balancing hole | 1598KB | download |