|
| Effect of Stator Blade Number on Cavitation Performance of Pump-jet Propulsor |
| |
| View Full Text View/Add Comment Download reader |
| DOI：10.7643/issn.1672-9242.2022.05.007 |
| KeyWord:pump-jet propulsor cavitation density-corrected stator number vorticity transport equation |
| Author | Institution |
| LI Fu-zheng |
School of Marine Science and Technology, Northwestern Polytechnical University, Xi'an , China;Key Laboratory of Unmanned Underwater Vehicle, Northwestern Polytechnical University, Xi'an , China |
| HUANG Qiao-gao |
School of Marine Science and Technology, Northwestern Polytechnical University, Xi'an , China;Key Laboratory of Unmanned Underwater Vehicle, Northwestern Polytechnical University, Xi'an , China |
| PAN Guang |
School of Marine Science and Technology, Northwestern Polytechnical University, Xi'an , China;Key Laboratory of Unmanned Underwater Vehicle, Northwestern Polytechnical University, Xi'an , China |
| SUN Guo-cang |
Wuhan Second Ship Design and Research Institute, Wuhan , China |
|
| Hits: |
| Download times: |
| Abstract: |
| To improve the hydrodynamic performance of pump-jet propulsor (PJP) and take into consider its cavitation performance, this work employs the RNG k-ε turbulence model combined with the Zwart cavitation equation to predict the PJP cavitation with various stator numbers (Ns ranges 6~10), and the turbulent viscosity is corrected by DCM (Density Corrected Model) approach. The results show that the PJP cavitation is mainly the tip cavitation and sheet cavitation on the blade surface, while the time-frequency curves of cavitation are closely related to the number of blades. The single-rotor surface cavitation is associated with the stator number, whereas the total cavitation area is determined by the interaction of the rotor and stator. Moreover, the increase of the Ns improves the PJP thrust, the load of rotor blades and blade tip also increases, thus causing the cavitation to occur more easily. The sheet cavitation increases sharply with the increase of Ns in radial and chord-wise directions, and the rise in tip cavitation is much smaller than that of sheet cavitation. Eventually, when Ns increases from 6 to 10, the total cavity volume increases by more than 5 times. Further analysis of the vorticity transport equation reveals that the vortex dilation term plays a leading role in the evolution of cavitation and increases within a certain range of chord-wise direction as Ns increase. |
| Close |
|
|
|