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Numerical study on the energy extraction characteristics of a flapping foil with movable lateral flaps

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  • Tian, Chenye
  • Liu, Xiaomin

Abstract

This study focuses on how to improve the energy extraction performance of flapping foils by using movable lateral flaps. Three flaps are designed firstly, including fixed lateral flaps (FLFs), movable lateral flaps on the pressure side (PMLFs) and movable lateral flaps on the suction side (SMLFs). The energy extraction characteristics of foils with different flaps at different reduced frequency f* are investigated and compared based on numerical simulations. The results show that PMLFs have a more positive effect on the energy extraction of the foil than other flaps. Then the effect of the geometrical parameters of PMLFs including opening amplitude β0, lateral flap length lf and position df on the energy extraction efficiency η of flapping foils is studied, respectively. When using the suitable PMLFs, a larger lift is obtained by improving the pressure distribution and velocity circulation around the foil, which increases η. It is found that β0 has an optimal value, and a failure point exists when the sum of lf and df is 0.9c. The best design scheme of PMLFs is at β0 = 30°, lf = 0.2c and df = 0.8c, which help the flapping foil obtain the largest η = 48.0% at f* = 0.18, with an improvement of 21.7% than that of the conventional foil.

Suggested Citation

  • Tian, Chenye & Liu, Xiaomin, 2024. "Numerical study on the energy extraction characteristics of a flapping foil with movable lateral flaps," Renewable Energy, Elsevier, vol. 225(C).
    • Handle: RePEc:eee:renene:v:225:y:2024:i:c:s0960148124003094
    DOI: 10.1016/j.renene.2024.120244
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