Experimental comparison of backflow-vortex cavitation on pump inducer between cryogen and water

9th International Symposium on Cavitation

Ito, Y.^1 ; Tsunoda, A.^1 ; Nagasaki, T.^1

Department of Energy Sciences, Tokyo Institute of Technology, 4259-G3-33-402 Nagatsuta-cho, Midori-ku, Yokohama, Kanagawa

226-8502, Japan^1

关键词: Backflow;    Critical weber numbers;    Experimental comparison;    Head coefficients;    Vortex cavitation;    Vortex filament;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/656/1/012063/pdf
DOI  :  10.1088/1742-6596/656/1/012063

来源: IOP

【 摘 要 】

The backflow-vortex cavitation on a rotating inducer was experimentally observed in both liquid nitrogen and water. The cavitation appeared "foggy" in nitrogen and "foamy" in water. This is explained by the critical Weber number theory. The number of backflow-vortex cavitation columns decreased as the head coefficient increased. This tendency is explained by a theoretical analysis in which backflow vortices are regarded as an array of vortex filaments rotating along the casing around the inducer center. The number of backflow-vortex cavitation columns is determined by the fluid dynamics and is independent of thermodynamic properties.