非定常空化流动研究现状与进展

In view of numerical calculation models for unsteady cavitating flows, influences of mass transfer model between liquid and vapor phases on cavity development and vortex shedding were summarized. It was identified that cavitation models could produce significant different predictions in different cavity regimes. A density correction-based cavitation model (DCCM) had been proposed in our group, as a result, the unsteady pressure fluctuation characteristics in the wake of a hydrofoil were predicted reasonably well. By considering the multi-scale turbulence structure and local compressibility, a filter-based density correction turbulence model (FDCTM) was put forward and a better prediction was achieved against experimental data. Further, unsteady cavitating flow mechanisms were reviewed and discussed in detail based on existing experimental and simulation efforts on such flows by accounting for cavity shape, flow structure and hydrodynamic force from a cavitating flow characteristic and hydrodynamics point of view. Finally, based on the development tendency of investigation into unsteady cavitating flows and important problems potentially encountered in such a research, specific development directions were debated and prospected.