Numerical study on the flow in balancing hole. Issue 2 (March 2019)

• Record Type: Journal Article
• Authors: Matsui, Jun; Okubo, Atsushi; Yamashita, Yousuke
• Is Part Of: IOP conference series. Volume 240:Issue 2(2019)
• Publication Date: 2019-03
• Subjects: Earth sciences -- Periodicals; Environmental sciences -- Congresses; Environmental sciences -- Periodicals; 550.5
• DOI: 10.1088/1755-1315/240/2/022002
• Languages: English
• ISSNs: 1755-1307

Abstract

Abstract: 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.