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：2012
卷号：15
期号：2
DOI：10.1088/1755-1315/15/2/022001
出版社：IOP Publishing
摘要：For Francis turbines operating at part load or over load a swirl flow arises behind the runner. Due to instability and/or asymmetry of the spiral casing a helical-like vortex rope appears in the draft tube. The goal of the present paper is to develop models of cavitating vortex rope and to evaluate influence of the gas/vapor phase on the pressure pulsation in the turbine draft tube and on the hydroacoustic characteristics of the system as a whole
