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Propeller and vortex ring state for floating offshore wind turbines during surge
Renewable Energy ( IF 8.7 ) Pub Date : 2020-08-01 , DOI: 10.1016/j.renene.2020.03.105
Ryan Kyle , Yeaw Chu Lee , Wolf-Gerrit Früh

Abstract 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.

中文翻译:

浮式海上风机喘振过程中的螺旋桨和涡环状态

摘要 浮动风力涡轮机的喘振运动会导致转子向后运动的速度快于风速,从而导致类似螺旋桨的情况或涡环状态 (VRS)。在有利于螺旋桨和涡环状态的条件下,使用 OpenFOAM 研究了喘振对浮动涡轮推力的影响。由于较低的叶片速度和较大的叶片扭曲,显示出一个负推力区域从叶片根部向翼展方向延伸,表示螺旋桨状态。对于具有 9.4 m 振幅、8.1 s 周期和 7 m/s 风速的具有代表性的涌动模拟,证实了具有低/中等风速的强波会导致类似螺旋桨的条件的预测。整个转子的负推力,通过内侧区域的负推力和外侧区域的小但仍然是正推力的组合,在预期的激增周期部分观察到。由于负相对转子速度的持续时间与叶片通过周期相似,从而抑制了下游的涡流平流,因此在叶片尖端 - 涡流相互作用和根部涡流再循环中观察到 VRS。这项工作解释并演示了浮动涡轮机的螺旋桨状态和 VRS 的原因。
更新日期:2020-08-01
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