Water Wave Absorber by Making Use of Oscillating Hydrofoil

近些年来，随着海洋空间利用、海洋养殖、海洋休闲等方面的发展，对深水消波体的需求越来越大。然而，这种消波体的一个主要问题是深水系泊系统，因为消波体即使能够完全吸收入射波，也无法逃脱波浪漂移力的作用。为了克服消波体上的波浪漂移力，研究了水翼作为消波体的可行性。摆动水翼产生推力是众所周知的实验事实，但在实际情况下，由于非线性效应变得严重，精确的处理是困难的。利用二维和三维问题的线性位势理论，得到了水翼在波浪中产生的推力的水动力特性。为了验证数值计算的有效性，对一些厚机翼进行了绕射和辐射问题的模型试验。研究了水翼在波浪中产生的推力与机翼下沉、迎角、入射波频率的关系，并从理论和实验上证实了这一点。为了实现深水消波体的系泊系统，下一步需要研制一种小功率的定位系统来补偿漂移力的抵消误差。

Relating to the ocean space utilization, marine culture, marine leisure and so on, the needs of a good wave absorber in deep water have increased recent years. One main problem of such a wave absorber, however, is the mooring systems in deep water, because the wave absorber can not escape from the action of the wave drifting force even if it can absorb the incident waves completely. To overcome the wave drifting force on a wave absorber, we studied about the feasibility of the hydrofoil to the wave absorber. It is well-known as experimental facts that the oscillating hydrofoil generates the thrust, but the exact treatment is difficult because the nonlinear effects become severe in the actual situations. Hydrodynamic characteristics of thrust generated by a hydrofoil among waves are obtained by the linear potential theory in two- and three-dimensional problems. Model experiments for some thick wings were carried out in the diffraction and radiation problems to check the validity of the numerical calculations. The thrust generated by the hydrofoil among waves was studied as a function of the submergence of the wing, the angle of attack, the frequency of the incident waves and it was confirmed both in theory and experiments. To realize the mooring system of the wave absorber in deep water, a positioning system of the small power to compensate the errors in the cancellation of the drifting force should be developed in the next stage.