Parametric Design of a New Float-Type Wave Energy Generator and Numerical Simulation of Its Hydrodynamic Performance
Abstract
:1. Introduction
2. Mechanical Theory
2.1. Basic Control Equations
2.2. Turbulence Model
2.3. Wave Theory
3. Design and Energy Conversion Mechanism
3.1. China’s Offshore Wave Environment
3.2. Design Proposal
3.3. Characteristics of the Energy Conversion
3.4. Kinematic and Dynamic Characterizations
4. CFD Simulation Analysis of a New Float-Type Wave Energy Device
4.1. Setup of CFD Simulation
4.2. Computational Domain and Meshing
4.3. Analysis of Device Simulations during One Wave Cycle
4.4. Numerical Study of the Effect of Hydrodynamic Performance of Power Generating Units over the Full Operating Cycle
4.5. Numerical Study of the Effect of Structural Parameters on the Hydrodynamic Performance of Power Generation Units
5. Conclusions
- We constructed a numerical wave pool using STAR-CCM+ and applied overlapping grid technology to simulate the movement and power generation efficiency of a new float-type wave energy power generation device under Stokes fifth-order waves. Our findings indicate that this numerical method accurately captures changes in complex flow fields, and the simulated waves closely match the theoretical waves. Hence, it can serve as a reliable tool for numerical simulation of this device.
- In operation following the stability of the law, the new type of float wave power generating device in saltwater to perform the cycle movement may be viewed as the superposition of the movement of countless cycles. The device’s speed drops as it moves from the horizontal to the crest of the movement of the moment, and the speed declines ever faster, according to the examination of the device’s movement in a cycle. The pendulum velocity of the device increases slowly and then lowers quickly as it transitions from the crest to the trough. The device’s motion speed in the vertical direction gradually increases until it reaches its maximum speed at the wave peak as it passes from the wave valley to the horizontal plane. The torque and speed of the rotating blades have a significant impact on the device’s output power.
- According to the structural design and optimization of the device, it was found that the overall movement of the device is less affected by changes in the number of blades, and regardless of the changes in the number of blades, the vertical displacement and velocity of the device exhibit periodic changes. Under the influence of waves, the moment of the blades varies on a regular basis, and the moment of the blades rises as the number of blades grows. A suitable increase in the number of blades can cause the turbofan to create a greater rotating moment because the pressure differential at the leading edge of the blade surface steadily increases with the number of blades. The output power of the device increases with the number of blades, and the five blades turbofan performs better overall in terms of equipment cost, operation, and power generation efficiency.
Author Contributions
Funding
Data Availability Statement
Acknowledgments
Conflicts of Interest
References
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Parameters | Numerical Value |
---|---|
Number of leaves | 5 |
Chord length/m | 0.05 |
Wheel radius/m | 0.05 |
Flange radius/m | 0.05 |
Wheel thickness/m | 0.03 |
Combined Parameters | Physical Models |
---|---|
Space | Three-dimensional |
Time | Implicit invariant (math.) |
Eulerian multiphase flow model | Volume of fluid domain |
Turbulence model | |
Other models | Gravity, VOF waves |
Working Condition | Number of Leaves | Period T(s) | Wave Height (m) |
---|---|---|---|
A1 | 3 | 1.5 | 0.1 |
A2 | 4 | 1.5 | 0.1 |
A3 | 5 | 1.5 | 0.1 |
A4 | 6 | 1.5 | 0.1 |
Working Condition | Amplitude of Pendulum Displacement (m) | Amplitude of Pendulum Speed (m/s) | Amplitude of Rotational Torque (N·m) | Rotational Speed (rad/s) | Power (W) |
---|---|---|---|---|---|
A1 | 0.372 | 0.158 | 0.004 | 2.352 | 0.012 |
A2 | 0.381 | 0.157 | 0.009 | 2.831 | 0.023 |
A3 | 0.407 | 0.161 | 0.014 | 3.613 | 0.053 |
A4 | 0.411 | 0.159 | 0.015 | 3.707 | 0.059 |
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Zhang, Y.; Li, D. Parametric Design of a New Float-Type Wave Energy Generator and Numerical Simulation of Its Hydrodynamic Performance. J. Mar. Sci. Eng. 2023, 11, 2192. https://doi.org/10.3390/jmse11112192
Zhang Y, Li D. Parametric Design of a New Float-Type Wave Energy Generator and Numerical Simulation of Its Hydrodynamic Performance. Journal of Marine Science and Engineering. 2023; 11(11):2192. https://doi.org/10.3390/jmse11112192
Chicago/Turabian StyleZhang, Yu, and Dongqin Li. 2023. "Parametric Design of a New Float-Type Wave Energy Generator and Numerical Simulation of Its Hydrodynamic Performance" Journal of Marine Science and Engineering 11, no. 11: 2192. https://doi.org/10.3390/jmse11112192
APA StyleZhang, Y., & Li, D. (2023). Parametric Design of a New Float-Type Wave Energy Generator and Numerical Simulation of Its Hydrodynamic Performance. Journal of Marine Science and Engineering, 11(11), 2192. https://doi.org/10.3390/jmse11112192