ABSTRACT

In this paper, a new design scheme for counter-rotating horizontal-axis tidal turbines (CRHATTs) is introduced using blade element momentum (BEM) theory. The coordinated working performance between rotor and generator of the CRHATT are analysed by experimental and CFD methods. The effects of the key parameters on the energy harvesting efficiency of the CRHATT are studied in detail. The study indicates the existence of the optimal rotor solidity (σ) combination and blade installation angle (γ) combination for dual rotors to reduce the power coefficient (C_p) deviation of the dual rotors. The distance between dual rotors (L) is suggested to be set as about 0.225D, which can maximise the C_p of the CRHATT. Finally, the hydrodynamic performance of the flow field is carried out to verify the reliability of the CRHATT design. The results presented in this paper may serve as a reference in the design of CRHATTs in practical engineering.

摘要

本文利用叶片元动量 (BEM) 理论介绍了一种新的反向旋转水平轴潮汐涡轮机 (CRHATTs) 设计方案。采用实验和CFD方法分析了CRHATT转子与发电机的协调工作性能。详细研究了关键参数对CRHATT能量收集效率的影响。研究表明，双转子存在最优转子实度（σ）组合和叶片安装角（γ）组合，以降低双转子功率系数（C _p）偏差。双转子之间的距离（L）建议设置为0.225D左右，这样可以最大化C _p的CRHATT。最后，对流场的水动力性能进行了验证，以验证CRHATT设计的可靠性。本文的研究结果可为实际工程中CRHATTs的设计提供参考。