规则波作用下垂荡浮子间歇射流装置水动力数值研究

HYDRODYNAMIC NUMERICAL STUDY OF INTERMITTENT JET DEVICE WITH HEAVING BUOY UNDER REGULAR WAVE

利用波浪能驱动垂荡浮子间歇射流装置,实现表层富氧水向深层输移。以浮子垂荡运动水动力行为为研究对象,利用数值模拟研究波参数、浮子几何参数和等效阻尼系数的影响规律。结果发现:1)随着入射波高增加,浮子垂荡响应幅度增加;随着入射波周期增加,浮子垂荡响应幅度增加,增幅先大后小再增大;2)浮子垂荡响应幅度随浮子直径增加而增加;浮子密度变化对垂荡响应幅度影响较小;3)随着等效阻尼系数增加,浮子垂荡响应幅度减小。最后,采用量纲分析法,建立并验证了浮子相对垂荡响应幅度的预测公式。

The intermittent jet device with a heaving buoy is driven by wave energy to transport surface oxygen-rich water to deep zone.In the paper,the effect of the wave parameters,buoy geometric parameters and equivalent damping coefficient on the hydrodynamic behavior of buoy heaving motion is examined numerically.It is found that:1)The average amplitude of buoy heaving response increases with the increase of incident wave height.With the increase of incident wave period,the average amplitude of buoy heaving response increases,and the growth rate increases first,then decreases and eventually increases.2)With increasing buoy diameter,the average amplitude of buoy heaving response increases.The buoy density plays a minor role in the average amplitude of buoy heaving response.3)With the increase of equivalent damping coefficient,the average amplitude of buoy heaving response decreases.Eventually,by the dimensional analysis method,a prediction equation of relative amplitude of buoy heaving response is established and verified.