Confinement effects in wind-turbine and propeller measurements
Confinement effects in wind-turbine and propeller measurements
复制标题
风力涡轮机和螺旋桨测量中的限制效应
DOI：
10.1017/jfm.2014.440
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发表时间：
2014
影响因子：
3.7
通讯作者：
Pieter Inghels
中科院分区：
文献类型：
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作者：
A. Segalini;Pieter Inghels
摘要 提出了一种新模型来解释风力涡轮机或螺旋桨测量中测试段壁的存在。此处假设测试部分为圆柱形，通过轴对称源板进行建模，而风力涡轮机（或螺旋桨）则使用简化的涡流模型进行建模（Segalini & Alfredsson, J. Fluid Mech., vol. 725, 2013, pp. 91–116）。将两个模型组合在迭代方案中可以模拟测试段壁对转子周围流场的影响。基于这种新颖的方法，对由于堵塞引起的流动修改进行了分析，并与执行器盘理论结果进行了比较。格劳特的等效无侧限涡轮机概念经过回顾和扩展，以解释转子的角速度。结果表明，Glauert 的等效自由流速度概念是有益的，并且可以纠正由于测试段墙的存在而引入的大部分系统误差，尽管仍然存在一些差异，特别是在功率系数方面。还从尾流膨胀/收缩、尖端涡旋的桨距和转子处的力的角度讨论了约束对尾流结构的影响。
Abstract A new model to account for the presence of the test-section wall in wind-turbine or propeller measurements is proposed. The test section, here assumed to be cylindrical, is modelled by means of axisymmetric source panels, while the wind turbine (or the propeller) is modelled with a simplified vortex model (Segalini & Alfredsson, J. Fluid Mech., vol. 725, 2013, pp. 91–116). Combining both models in an iterative scheme allows the simulation of the effect of the test-section wall on the flow field around the rotor. Based on this novel approach, an analysis of the flow modification due to blockage is conducted together with a comparison of actuator-disk theory results. Glauert’s concept of equivalent unconfined turbine is reviewed and extended to account for the angular velocity of the rotor. It is shown that Glauert’s equivalent free-stream velocity concept is beneficial and can correct most of the systematic error introduced by the presence of the test-section wall, although some discrepancies remain, especially in the power coefficient. The effect of the confinement on the wake structure is also discussed in terms of wake expansion/contraction, pitch of the tip vortices and forces at the rotor.