基于M-BEMT2.0研究串列海流发电机的水动力性能

海流发电机(MCT)是开发海洋可再生能源的重要装置。在预测海流发电机水动力性能方面,修正叶素动量理论(M-BEMT)方法被验证是一种简单有效的方法。为了进一步提高M-BEMT方法的适用性和准确性,基于M-BEMT方法开发M-BEMT2.0方法包括时均法(TA-BEMT2.0)和瞬态积分法(TI-BEMT2.0),新方法考虑了来流的轴向非均匀性和周向非均匀性。首先使用文献的试验结果验证均匀来流时新方法的适用性。然后使用计算流体力学(CFD)计算结果验证非均匀来流时新方法的适用性。最后结合新方法和CFD方法深入研究两个串列排布海流发电机(MCTA)的水动力性能。基于M-BEMT2.0研究发现,均匀来流时计算结果与试验结果基本吻合,非均匀来流时新方法的计算结果优于M-BEMT的计算结果。对于MCTA,当第一个MCT的叶尖速度比越大,第二个MCT功率比和推力比恢复到90%的距离越短。

Hydrodynamic performance of marine current turbine array based on M-BEMT2.0 method

The marine current turbine (MCT) is an important device for developing renewable energy in the ocean. The modified blade element momentum theory (M-BEMT) method was proved to be a simple and effective method for predicting the hydrodynamics of MCT. In order to further improve the applicability of M-BEMT method, M-BEMT2.0 methods including time-averaging method (TA-BEMT2.0) and transient integration method (TI-BEMT2.0) were developed based on M-BEMT method. The applicability of M-BEMT2.0 methods in uniform flow is verified by published experimental results, and then CFD calculation is used to verify the applicability of the new method for non-uniform incoming flow. Finally, the hydrodynamics of marine current turbine array (MCTA) is studied by considering M-BEMT2.0 and CFD. Based on the research of M-BEMT2.0, it is found that the calculation results of the new method are basically consistent with the experimental results when the flow is uniform, and the calculation results of the new method are better than those of M-BEMT when the flow is non-uniform. For MCTA, the greater the tip velocity ratio of the first MCT, the shorter the distance when the power ratio and thrust ratio of the second MCT are restored to 90%.