振荡浮子波能装置波浪冲击特性数值模拟研究

Numerical simulation of impulse characteristics on oscillating buoy wave energy converter

振荡浮子波能装置垂荡获能过程中会受到强烈的波浪冲击作用,因此有必要对浮子的波浪冲击特性开展研究。基于雷诺平均纳维-斯托克斯方程(RANS)建立了波浪与浮子耦合作用的数值模型,通过试验数据验证了所建模型的准确性,采用建立的模型分析了浮子表面的波浪冲击特性。通过数值分析得到以下结论:浮子底部受到的波浪冲击压力近似为正弦脉冲形式,在波浪行进方向上与前侧距离越大,无量纲冲击压力值越大;浮子迎浪侧波浪冲击压力随散射参数的增大而增加,其他位置处的冲击压力受散射参数的影响不明显;浮子上的最大波浪冲击压力受能量摄取(PTO)系统的影响很小。

The oscillating buoy wave energy converter will be impacted strongly during oscillating and energy capture,so it is necessary to study the wave impact characteristics of the buoy. The numerical model of the coupling effect between wave and buoy is built based on Reynolds-averaged Navier-Stokes equations(RANS). The accuracy of the model is verified by experimental data, and the wave impact characteristics on the surface of the buoy is deduced by the numerical simulation. The numerical analysis result shows that the wave impulse on the bottom of the buoy is approximately sinusoidal, and at the same time, the larger the distance from the front side in the wave traveling direction, the larger the dimensionless impact pressure value. The wave impact pressure on the wave-facing side of the buoy increases with the increase of scattering parameters, while the impact pressure at other positions is not obviously affected by scattering parameters. The maximum wave impact pressure on the buoy is little affected by the power takeoff(PTO) system.