期刊名称：IOP Conference Series: Earth and Environmental Science
印刷版ISSN：1755-1307
电子版ISSN：1755-1315
出版年度：2019
卷号：240
期号：2
页码：1-8
DOI：10.1088/1755-1315/240/2/022013
出版社：IOP Publishing
摘要：In case of the hydro turbine operated departing from the optimum condition, vortex ropes usually occur in the draft tube, and consequently generate pressure oscillations. In most conditions, cavitation occurred in the center of the rope and turned it to be a multiphase cavitating rope. This kind of unsteady flow phenomenon is believed to be harmful for hydropower stations. This paper designs a kind of vortex-control grooves and make a numerical simulation in a Francis hydro turbine using the partially averaged Navier-Stokes method. The behavior of the cavitation rope and the induced pressure oscillations under several operation conditions with and without the grooves will be analyzed based on the calculation results.
