Abstract
High-speed video and particle image velocimetry (PIV) technique are combined to carry out the flow structure and kinetic characteristics of sheet cavitation around three different coating hydrofoils and discuss the influence of different coatings. The results show three main phenomena. Firstly, coatings' roughness and material both effect on the flow structure and kinetic characteristics. For different coatings, restriction on sheet cavitation generated by fluorocarbon coating is stronger than epoxy coating, and rough surface is weaker than the smooth. Coating effects on the kinetic characteristics of sheet cavitation. Compared with roughness, material of coating has more obvious effect on the kinetic characteristics of sheet cavitation. When in the sheet cavitation, for smooth surface fluorocarbon coating, the length of cavitation and the area of low-speed region is the smallest, while the distribution of vorticity in the low-speed region is most concentrated. Different coatings have different position of vortex, leading to different position of collapse and different length of cavity.
| Original language | English |
|---|---|
| Pages (from-to) | 1481-1487 |
| Number of pages | 7 |
| Journal | Kung Cheng Je Wu Li Hsueh Pao/Journal of Engineering Thermophysics |
| Volume | 39 |
| Issue number | 7 |
| Publication status | Published - 1 Jul 2018 |
Keywords
- Cavitation
- Coating
- Experimental study
- Flow characteristics
- Hydrofoils