Abstract
The influence of head-jetting on the flow field and the impact of water-entry with different jet mass flow rate and initial velocity of object is numerically investigated. The results show that the head-jetting could reduce and delay the impact peak significantly. Meanwhile the bobble in front of the object head could improve the hydrodynamic shape effectively, while the air attached to the side wall could reduce the friction. As a result, the velocity of the object in the water is increased. These benefits are enhanced with the increase of the jet mass flow rate. The air cushion effect is observed for a high-speed water-entry object, which could weaken the impact loading. Additionally, the performance of the jet on reducing the impact increases with the velocity of water-entry firstly and then keeps mostly unchangeable.
| Original language | English |
|---|---|
| Pages (from-to) | 300-305 |
| Number of pages | 6 |
| Journal | Kung Cheng Je Wu Li Hsueh Pao/Journal of Engineering Thermophysics |
| Volume | 40 |
| Issue number | 2 |
| State | Published - 1 Feb 2019 |
| Externally published | Yes |
Keywords
- Head-jetting
- Impact loading
- Numerical simulation
- Water-entry of object
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