Performance Improvement of Hydrofoil with Biological Characteristics: Tail Fin of a Whale
Abstract
:1. Introduction
2. Model
2.1. Calculation Model
2.2. Independence of the Number of Grids and Reliability Verification
3. Results and Analysis
3.1. Influence of Flap Angle (FA) on Hydrodynamic Performance of Hydrofoil
3.2. Influence of Flap Length (FL) on Hydrodynamic Performance of Hydrofoil
3.3. Influence of Flap on Hydrodynamic Performance of Hydrofoil at Different REYNOLDS Numbers
4. Conclusions
- By comparing the vector diagram of the PIV experiment with the trace diagram of CFD, it is found that the size and position of the vortex measured in the experiment are close to that obtained by CFD, which shows that the simulation has high reliability.
- By comparing the streamline diagrams of AOA = 9°, AOA = 12°, and AOA = 15°, it is found that when AOA = 9°, partial flow separation occurs at the tail of the hydrofoil; With the increase of the angle of attack (AOA = 12°), the hydrofoil appears complete flow separation, the hydrofoil stalls and the lift coefficient decreases; As the angle of attack continues to increase (AOA = 15°), the hydrofoil appears double separation vortex. At this time, the hydrofoil has a deep stall effect and the lift increases again.
- By analyzing the influence of flap angle (FA) on the hydrodynamic performance of hydrofoil, it is found that the hydrofoil with clockwise flap can have better hydrodynamic characteristics at a small angle of attack (AOA ≤ 6°) under the same Reynolds number and flap length (FL). Although the counterclockwise flap will reduce the hydrodynamic characteristics of the hydrofoil, it will increase the critical stall angle to improve the navigation stability of the hydrofoil.
- By analyzing the influence of flap length (FL) on the hydrofoil hydrodynamics, it is found that hydrofoil with flap has better hydrodynamic characteristics at a small angle of attack(AOA ≤ 6°), and hydrofoil with a short flap has a better angle of attack characteristics, which can maintain a higher hydrodynamic performance in a wider range of angle of attack.
- By analyzing the influence of different Reynolds numbers on the hydrodynamic performance of hydrofoil, it is found that under the same small angle of attack, the hydrofoil with a short flap has better Reynolds number characteristics and can maintain a higher hydrodynamic performance in a wider range of Reynolds numbers.
- Compared with the original hydrofoil, the short flap improves the hydrodynamic performance of the hydrofoil at a small angle of attack. The hydrofoil can also be applied to various working conditions by adjusting the angle of the flap. Therefore, when designing the hydrofoil, a rotatable short flap can be added at the tail of the hydrofoil to enable the hydrofoil to navigate in a more complex flow environment.
Author Contributions
Funding
Institutional Review Board Statement
Informed Consent Statement
Data Availability Statement
Conflicts of Interest
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Type | State | Type | State |
---|---|---|---|
Fluid density | 1000 kg·m−3 | 1st layer thickness (mm) | 0.01 |
Turbulence model | SST k-ω | Growth ratio | 1.1 |
Turbulence intensity | 2% | Chord (C/mm) | 75 |
Inlet | Velocity inlet | Flap Length (FL: ×C) | 0, 0.1, 0.15, 0.2, 0.25, 0.3 |
Outlet | Pressure outlet | Angle of attack (AOA) | 0, 3, 6, 9, 12, 15, 18, 21 |
Reynolds number (×105) | 0.7, 2.1, 3.5, 7, 15 | Flap Angle (FA) | −10, −5, 0, 5, 10 |
Number of grids (million) | 0.9 | y+ | ≤1 |
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Xiong, P.; Deng, J.; Chen, X. Performance Improvement of Hydrofoil with Biological Characteristics: Tail Fin of a Whale. Processes 2021, 9, 1656. https://doi.org/10.3390/pr9091656
Xiong P, Deng J, Chen X. Performance Improvement of Hydrofoil with Biological Characteristics: Tail Fin of a Whale. Processes. 2021; 9(9):1656. https://doi.org/10.3390/pr9091656
Chicago/Turabian StyleXiong, Pan, Jianghong Deng, and Xinyuan Chen. 2021. "Performance Improvement of Hydrofoil with Biological Characteristics: Tail Fin of a Whale" Processes 9, no. 9: 1656. https://doi.org/10.3390/pr9091656