风能波浪能联合发电是实现“海上风电+”融合发展的最新模式,而风浪联合发电结构浮式平台中浮筒、立柱和浮子存在不同尺度的圆柱间干扰效应,对整个结构体系的荷载分布和整体稳定影响不可忽略。提出一种适合中国南海海况的新型风能-波浪能联合发电结构体系,再基于延迟脱体涡模拟方法分析平台内部波浪场演化过程,揭示平台区域水质点能量分布特性以及多浮体干扰机理,最后对比研究浮子对风浪联合发电平台水动力荷载的影响特性。结果表明：浮子的存在影响到两种平台各区域的水体能量变化,最大能量分布区域由波浪传播起始位置区域转变为浮子影响下波浪非线性干扰强烈的区域;浮子顺向波浪力最高达到8.27×105量级,较单浮子增幅22.3%,风浪联合发电平台中间立柱顺向波浪力极值荷载较半潜式平台减幅11.3%,但使得平台立柱所受顺向波浪荷载能量部分往高频转移。研究结论可为此类新型风浪联合发电结构体系水动力荷载设计提供科学依据。
Abstract
Wind and wave energy combined power generation is the latest mode to realize the integration of “Offshore Wind Power +” development. In the floating platform of wind and wave combined power generation structure, there are different scale cylindrical interference effects among buoys, columns and floaters, which cannot be ignored on the load distribution and overall stability of the whole structure system. A new wind-wave energy combined power generation structure system suitable for the South China Sea is proposed. Based on the delayed detached eddy simulation method, the evolution process of wave field inside the platform is analyzed, and the energy distribution characteristics of water quality points in the platform area and the interference mechanism of multiple floating bodies are revealed. Finally, the influence of floating bodies on the hydrodynamic load of the wind-wave combined power generation platform is compared and studied. The results show that the presence of buoys affects the change of water energy in each region of the two platforms, and the maximum energy distribution area changes from the initial position of wave propagation to the area with strong nonlinear wave interference under the influence of buoys. The maximum longitudinal wave force of the float is 8.27×105, which is 22.3 % higher than that of the single float. The maximum longitudinal wave force of the middle column of the wind-wave combined power generation platform is 11.3 % lower than that of the semi-submersible platform, but the energy of the longitudinal wave load on the platform column is transferred to high frequency. The research conclusions can provide scientific basis for the hydrodynamic load design of such new wind-wave combined power generation structure system.
关键词
风浪联合发电 /
波浪场 /
多尺度流场干扰 /
荷载特性 /
空间相关性
Key words
wind wave combined power generation /
wave field /
multi-scale flow interference /
load characteristics /
spatial correlation
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基金
国家重点研发计划（2017YFE0132000; 2019YFB1503701）; 江苏省杰出青年科学基金（BK20211518）; 国家自然科学基金（5207080548; 5211101879）
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