Propeller and vortex ring state for floating offshore wind turbines during surge
Propeller and vortex ring state for floating offshore wind turbines during surge
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DOI：
10.1016/j.renene.2020.03.105
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发表时间：
2020-08
期刊：
影响因子：
8.7
通讯作者：
R. Kyle;Y. Lee;W. Früh
中科院分区：
文献类型：
--
作者：
R. Kyle;Y. Lee;W. Früh
浮动风力涡轮机的喘振运动可导致转子比风更快地向后移动的状况，从而导致类似螺旋桨的状况或涡环状态（VRS）。在有利于螺旋桨和涡环状态的条件下，利用OpenFOAM研究了喘振对浮动涡轮机推力的影响。由于较低的叶片速度和较大的叶片扭转，显示负推力区域从叶根向叶尖展向延伸，表示螺旋桨状态。低/中等风速的强波浪导致螺旋桨状条件的预测得到了证实，为一个有代表性的浪涌模拟与9.4米的振幅在波与8.1秒的周期和7米/秒的风速。在喘振循环的预期部分，通过内侧区域的负推力和外侧区域的小但仍为正的推力的组合，观察到整个转子的负推力。由于转子负速度的持续时间与叶片通过周期相似，抑制了下游的涡流平流，因此在叶尖-涡流相互作用和根部涡流再循环的情况下观察到VRS。本文解释和论证了浮式水轮机螺旋桨状态和VRS的原因。
Surge motion of a floating wind turbine can lead to conditions where the rotor moves backwards faster than the wind, leading to propeller-like conditions or vortex ring state (VRS). The effect of surge on the thrust of a floating turbine was investigated with OpenFOAM for conditions favourable to propeller and vortex ring state. Due to lower blade velocities and larger blade twists, a region of negative thrust is shown to extend spanwise from the blade root towards the tip signifying propeller state. Predictions that strong waves with low/moderate wind speeds leads to propeller-like conditions were confirmed for a representative surging simulation with a 9.4 m amplitude in waves with an 8.1 s period and 7 m/s wind speed. A negative thrust for the entire rotor, through the combination of an inboard region of negative and outboard region of small but still positive thrust, was observed during the expected part of the surging cycle. VRS was observed with blade tip-vortex interaction and root vortex recirculation due to the duration with a negative relative rotor velocity being similar to the blade passing period, inhibiting vortex advection downstream. This work explains and demonstrates the causes of propeller state and VRS for floating turbines.