Progress and prospects of investigation into unsteady cavitating flows
HUANG Biao1，WU Qin1,2，WANG Guoyu1
1.School of Mechanical Engineering, Beijing Institute of Technology, Beijing 100081, China;2. Department of Thermal Engineering, Tsinghua University, Beijing 100084, China
Abstract：In view of numerically computational 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)has been proposed in our group, as a result, the unsteady pressure fluctuation characteristics in the wake of a hydrofoil was 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.
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