In this research, a camber changing mechanism feasible for use in a flapping hydrofoil tidal stream turbine is suggested to generate high lift force and subsequently a large flapping angle as a dynamic response. The hydrodynamic characteristics of rigid and variable-camber hydrofoils, which mainly affect the response, were numerically obtained using XFOIL. The flapping responses of the hydrofoils were estimated by a validated nonlinear dynamic model with the hydrodynamic characteristics. The estimated responses of a variable-camber hydrofoil were compared with the measured responses of the rigid hydrofoil from a previous study as well as the estimated responses of a rigid hydrofoil. It was shown from these comparisons that the variable-camber hydrofoil produced a much higher flapping angle amplitude with the same pitch angle relative to that of the rigid wing due to the cambered shape of the former. Moreover, the variable-camber hydrofoil could generate considerable flapping responses compared to experimental data, even when a relative small input pitch angle was applied in the estimation.

在这项研究中，提出了一种适用于拍打式水翼潮汐流涡轮机的外倾换向机构，该机构可产生较高的升力，并随后产生较大的拍打角作为动态响应。使用XFOIL数值获得了主要影响响应的刚性和可变腔水翼的水动力特性。通过具有水动力特性的经过验证的非线性动力学模型来估计水翼的拍打响应。将可变弧度翼型的估计响应与先前研究中的刚性翼型的测量响应以及刚性翼型的估计响应进行了比较。从这些比较中可以看出，由于前者的弧形形状，相对于刚性机翼，在相同的俯仰角的情况下，可变室的水翼产生了高得多的拍打角幅度。此外，与实验数据相比，即使在估计中应用了相对较小的输入俯仰角时，可变腔室水翼也可能产生相当大的拍打响应。