一种点吸式波浪能装置水动力性能优化

Hydrodynamic performance optimization of a point absorber

摘要:

为改善点吸式波浪能装置的运动性能,运用基于黏性流体力学的计算流体力学(CFD)方法对一种特定的点吸式波浪能装置中的浮子进行三维时域模拟,研究不同浮子形状、阻尼系数和浮子质量对装置性能的影响规律．结果表明:运用CFD方法和实验方法得出的浮子运动曲线较为吻合,CFD值较基于势流理论的计算值更接近于实验值;在自然振荡和阻尼振荡时,圆台形浮子的运动性能都优于圆柱形浮子;圆台浮子的俘获宽度比会随着机械阻尼系数的增大呈现先增大后减小的规律,其最大值对应的阻尼值即为最佳阻尼值;俘获宽度比随着质量的增大呈现缓慢增加后略有减小的规律．

Abstract:

To improve the hydrodynamic performance of point absorber, the CFD method based on viscous fluid mechanics was used to simulate the buoy motion of point absorber in three-dimensional. The influences of different buoy shape, different damping coefficients, mass and motions performance were researched, and the CFD results agreed with the experimental results better than that of the potential theory. The circular column buoy was better than the circular truncated cone buoy in natural and damping oscillation, and with the enlarging of damping coefficient, the capture width ratio increased in the best damping and then decreased. The damping coefficient corresponding to the maximum capture width ratio was the best. With the enlarging of mass, the capture width ratio increased slowly and had a slight decrease.