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首页> 外文会议>AIAA SciTech forum;ASME wind energy symposium >Downwind Pre-Aligned Rotor for a 13.2 MW Wind Turbine
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Downwind Pre-Aligned Rotor for a 13.2 MW Wind Turbine

机译：适用于13.2兆瓦风力涡轮机的顺风预对准转子

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To alleviate the mass-scaling issues associated with conventional upwind rotors of extreme-scale turbines, a downwind rotor concept is considered that uses coning and curvature to align the non-circumferential loads for a given steady-state condition. This alignment can be pre-set to eliminate downwind blade moments for a given steady-state condition near rated wind speed and to minimize them for other conditions. The alleviation in downwind cantilever loads may enable a reduced structural blade mass as compared with a conventional upwind rotor. Previous quasi-steady scaling analysis indicates that this cantilever load alleviation becomes significant for extreme-scale systems (10-20 MW). To examine the potential impact of this design, Finite Element Analysis (FEA) was conducted for a 13.2 MW rated turbine at steady-state conditions for two rotor configurations with similar power outputs: 1) a conventional upwind rotor with three blades and 2) a downwind pre-aligned rotor (DPAR) with two blades. Based on previous work, the pre-aligned rotor configuration was set based on steady-state loads at a wind speed equal to 1.25 times the rated wind speed. By keeping the blade mass about the same between these two configurations, the rotor mass was reduced by approximately one third for the DPAR configuration. In addition, the average stresses on the blades for a variety of steady-state wind speeds was reduced for the DPAR configuration. However, these results can only be considered to be qualitative in terms of impact on turbine mass and cost. In particular, simulations at non-ideal, extreme and unsteady conditions are needed to determine the viability of this concept.
机译：为了减轻与极端规模涡轮机的常规逆风转子相关的质量缩放问题，考虑了顺风转子概念，其使用圆锥和曲率来对准给定稳态条件下的非周向负载。可以预先设置这种对齐方式，以消除额定风速附近给定稳态条件下的顺风叶片力矩，并在其他条件下将其最小化。与常规的迎风转子相比，减轻顺风悬臂负载可以减小结构叶片的质量。先前的准稳态缩放分析表明，对于极端规模的系统（10-20 MW），这种悬臂式负载减轻变得非常重要。为了检查该设计的潜在影响，在稳态条件下针对功率输出相同的两个转子配置，对额定功率13.2 MW的涡轮机进行了有限元分析（FEA）：1）具有三个叶片的常规上风转子和2）a带有两个叶片的顺风预对准转子（DPAR）。根据之前的工作，基于稳态负载在风速等于额定风速1.25倍的情况下设置了预对准的转子配置。通过使这两种配置之间的叶片质量大致相同，对于DPAR配置，转子质量减少了大约三分之一。此外，对于DPAR配置，降低了各种稳态风速时叶片上的平均应力。但是，这些结果只能视为对涡轮机质量和成本的影响而具有定性。特别是，需要在非理想，极端和不稳定的条件下进行仿真，以确定此概念的可行性。

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