Journal of Shandong University(Engineering Science) ›› 2020, Vol. 50 ›› Issue (6): 1-8.doi: 10.6040/j.issn.1672-3961.0.2020.160

• Mechanical Engineering—Special Topic on Ocean Engineering and Technology •     Next Articles

The influence of shape parameters of wave energy device floating body on energy capture characteristics

Yanjun LIU1,2(),Wei WANG2,Zhi CHEN1,Donghai WANG3,Dengshuai WANG2,Gang XUE2   

  1. 1. Key Laboratory of High-efficiency and Clean Mechanical Manufacture, School of Mechanical Engineering, Shandong University, Jinan 250061, Shandong, China
    2. Institute of Marine Science and Technology, Shandong University, Qingdao 266237, Shandong, China
    3. China Electric Technology Ocean Information Technology Research Institute Co., Ltd., Beijing 100041, Beijing, China
  • Received:2020-05-12 Online:2020-12-20 Published:2020-12-15

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Abstract:

To clarify the effect of the floating body′s shape parameters on the energy capture performance and working stability, an oscillating float type wave energy converter (WEC) model with linear power take-off system was established. Frequency domain calculation theory was used to deduce the formulas of energy capture power and energy capture width ratio. After introducing the numerical simulation steps of floating body in frequency domain, ANSYS-AQWA software was used to investigate the floater's energy capture power and energy capture width ratio with different bottom shapes and half vertex angles. Influence of shape parameters on the energy capture performance was drawn to provide a theoretical basis for the shape optimization of the floating body applied to the wave power supply device and floating platform. The results showed that the practical fabrication feasibility of circular truncated cone bottom was higher than that of cone and sphere. The energy capture characteristics and stability of circular truncated cone bottom were better than that of general cylindrical floating body in the intermediate wave frequency band. The energy capture performance and working stability of circular truncated cone floating body with big top and small bottom were better. The energy capture performance under intermediate frequency waves could be improved with the increase of the half vertex angle. The optimal power capture performance and working stability could be achieved with a proper apex angle.

Key words: wave energy, oscillating buoy wave energy converter, shape parameter, energy capture characteristics, AQWA simulation

CLC Number: 

  • TH137

Fig.1

Schematic diagram of the structure of floating bodies with different bottom shapes"

Fig.2

Heave RAO curves with different bottom shapes"

Fig.3

Unit wave height wave excitation force with different bottom shapes"

Fig.4

Power of sag energy of floating bodies with different bottom shapes"

Fig.5

Schematic diagram of the structure of a circular truncated cone floating body"

Fig.6

Heave RAO curves with different half vertex angles (α≥0°)"

Fig.7

Heave RAO curves with different half vertex angles (α≤0°)"

Fig.8

Wave excitation force experienced by buoys at different half vertex angles(α≥0°)"

Fig.9

Wave excitation force experienced by buoys at different half vertex angles(α≤0°)"

Fig.10

Power of different half vertex angles buoys to capture wave energy(α≥0°)"

Fig.11

Power of different half vertex angles buoys to capture wave energy(α≤0°)"

Fig.12

Energy capture width ratio of floating bodies with different half vertex angles(α≥0°)"

Fig.13

Energy capture width ratio of floating bodies with different half vertex angles (α≤0°)"

Fig.14

Variation curve of trapped wave energy power with different half vertex angles"

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