A blade element actuator disc approach applied to tidal stream turbines
A blade element actuator disc approach applied to tidal stream turbines
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DOI：
10.1109/oceans.2010.5664564
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发表时间：
2010-12
期刊：
影响因子：
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通讯作者：
M. Harrison;W. Batten;A. Bahaj
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文献类型：
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作者：
M. Harrison;W. Batten;A. Bahaj
在商业规模上，潮汐流涡轮机可能安装在多设备阵列中，以最大限度地提高潮汐站点的功率输出。本文演示了一种计算效率高的方法来预测阵列的性能。该方法通过使用叶素（BE）理论推导动量源项来参数化涡轮机。将源项加入到雷诺平均Navier-Stokes（RANS）动量方程中。RANS+BE方法类似于叶素动量（BEM）理论，但可以预测流场以及转子的性能。这项调查首先验证了RANS+BE方法对边界元理论，并显示出良好的协议，虽然叶尖损失仍然需要包括在内。其次，它比较了RANS+BE方法的参数化的基础上，一个统一的阻力系数，在一个范围内的环境湍流值和推力系数。与均匀方法相比，RANS+BE方法在近尾流中产生增加的方位角速度。最后，调查比较结果的一个模型的无限宽阵列的涡轮机与五排。RANS+BE模型可以预测每个涡轮机的性能。并且显示出在阵列内更快的尾流速度恢复。调查提供了一个详细的洞察尾流建模技术的潮汐流涡轮机阵列的配置的适用性。
At a commercial scale tidal stream turbines are likely to be installed in multi-device arrays to maximise power output from a tidal site. This paper demonstrates a computationally efficient method for predicting the performance of an array. The approach parameterises the turbine by deriving momentum source terms using blade element (BE) theory. The source terms are added to Reynolds-averaged Navier-Stokes (RANS) momentum equations. The RANS+BE method is similar to blade element momentum (BEM) theory but can predict the flow field as well as the performance of the rotor. This investigation first verifies the RANS+BE method against BEM theory and shows good agreement, although tip-losses still need to be included. Secondly, it compares the RANS+BE approach to a parameterisation based on a uniform resistance coefficient, over a range of ambient turbulence values and thrust coefficients. The RANS+BE method generates increased azimuthal velocities in the near wake compared to the uniform approach. Finally the investigation compares results of a model of an infinitely wide array of turbines with five rows. The RANS+BE model can predict the performance of each turbine. and shows more rapid wake velocity recovery within the array. The investigation provides a detailed insight into the applicability of wake modelling techniques for the configuration of tidal stream turbine arrays.