Article ID Journal Published Year Pages File Type
4993954 International Journal of Heat and Mass Transfer 2017 15 Pages PDF
Abstract
The hydrodynamic characteristics of axisymmetric ventilated supercavitating flows influenced by drag-reduction additives are numerically studied. The Cross viscosity model, a shear-thinning model, is employed to characterize the rheological feature of the aqueous solution of the drag-reduction additives. First, the numerical calculation procedure is established and verified, and the numerical results are in good agreement with the existing correlations. And then the air-liquid two-phase and air-liquid-vapor three-phase ventilated supercavitating flows in water and drag-reducing solution, respectively, are investigated. The flow resistance and morphological characteristics of the ventilated supercavities are mainly analyzed. It is obtained that the drag-reduction additives mainly influence the friction drag when the supercavities have not fully formed. The friction drag reduction rate can reach up to 49.66% and 58.13% in the two-phase and three-phase flows, respectively, in the currently investigated cases. Moreover, the vapor region caused by natural cavitation is larger in the drag-reducing solution.
Keywords
Related Topics
Physical Sciences and Engineering Chemical Engineering Fluid Flow and Transfer Processes
Authors
, , , ,