Vortex model of the aerodynamic wake of airborne wind energy systems

IF 3.6 Q3 GREEN & SUSTAINABLE SCIENCE & TECHNOLOGY
Filippo Trevisi, C. Riboldi, A. Croce
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引用次数: 2

Abstract

Abstract. Understanding and modeling the aerodynamic wake of airborne wind energy systems (AWESs) is crucial for estimating the performance and defining the design of such systems, as tight trajectories increase induced velocities and thus decrease the available power, while unnecessarily large trajectories increase power losses due to the gravitational potential energy exchange. The aerodynamic wake of crosswind AWESs flying circular trajectories is studied here with vortex methods. The velocities induced at the AWES from a generic helicoidal vortex filament, trailed by a position on the AWES wing, are modeled with an expression for the near vortex filament and one for the far vortex filament. The near vortex filament is modeled as the first half rotation of the helicoidal filament, with its axial component being neglected. The induced drag due to the near wake, built up from near vortex filaments, is found to be similar to the induced drag the AWES would have in forward flight. The far wake is modeled as two semi-infinite vortex ring cascades with opposite intensity. An approximate solution for the axial induced velocity at the AWES is given as a function of the radial (known) and axial (unknown) position of the vortex rings. An explicit and an implicit closure model are introduced to link the axial position of the vortex rings with the other quantities of the model. The aerodynamic model, using the implicit closure model for the far wake, is validated with the lifting-line free-vortex wake method implemented in QBlade. The model is suitable to be used in time-marching aero-servo-elastic simulations and in design and optimization studies.
机载风能系统气动尾流的旋涡模型
摘要了解和建模机载风能系统(AWES)的空气动力学尾流对于估计此类系统的性能和定义此类系统的设计至关重要,因为紧凑的轨迹会增加诱导速度,从而降低可用功率,而不必要的大轨迹会因引力势能交换而增加功率损失。本文用旋涡方法研究了侧风AWES绕圆飞行轨迹的气动尾流。由AWES机翼上的一个位置跟踪的普通螺旋涡丝在AWES处诱导的速度,用近涡丝和远涡丝的一个表达式建模。近涡灯丝被建模为螺旋灯丝的前半周旋转,忽略了其轴向分量。由近涡丝建立的近尾流引起的诱导阻力与AWES在前向飞行中的诱导阻力相似。远尾流被建模为两个强度相反的半无限旋涡环形叶栅。给出了AWES处轴向诱导速度的近似解,作为涡环径向(已知)和轴向(未知)位置的函数。引入了显式和隐式闭合模型,将涡环的轴向位置与模型的其他量联系起来。该气动模型采用了远尾流的隐式闭合模型,并用QBlade中的升力线自由涡尾流方法进行了验证。该模型适用于时间推进气动伺服弹性仿真以及设计和优化研究。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
Wind Energy Science
Wind Energy Science GREEN & SUSTAINABLE SCIENCE & TECHNOLOGY-
CiteScore
6.90
自引率
27.50%
发文量
115
审稿时长
28 weeks
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