基于致动盘方法分析潮汐能水轮机水动力性能

Analysis of Hydrodynamic Performance of Tidal Turbines Using Actuator Disc Method

【目的】为解决传统水轮机在数值仿真时计算量大、耗时长等问题,采用致动盘(actuator disc)方法研究潮汐能水轮机尾流场及其水动力性能。【方法】将推力T作为体积力的附加源项形式均匀加载致动盘上,并应用OpenFOAM软件进行数值模拟,以捕捉潮汐能水轮机流场特性。【结果与结论】将实验数据与仿真结果对比,发现两者在推力系数和功率系数随尖端速度比(tip-speed ratio,TSR)的变化趋势一致。TSR=5.5时发现实验数据与仿真结果的湍流强度和速度高度吻合,两者在流场的中心截面上误差分别为3%与5%。致动盘模型展示在尾流场细节特征的捕捉优势,可为后续研究提供参考。

【Objective】 The actuated disk method is used to solve the problems of large computational effort and time consumption in the numerical simulation of conventional hydraulic turbines, when the tidal energy turbine wake field and its hydrodynamic performance were studied.【Method】The thrust force T is uniformly loaded on the actuator disc as an additional source term of the volumetric force, and numerical simulations are carried out using OpenFOAM software to capture the flow field characteristics of the tidal turbine.【Result and Conclusion】Comparing the experimental data with the simulation results, we found that both showed the same trend in the variation of thrust coefficient and power coefficient with tip speed ratio(TSR). A high degree of agreement between the experimental data and the simulation results for turbulence intensity and velocity was found at TSR =5.5, with an error of 3% and 5% in the central cross section of the flow field. The actuating disc model demonstrates the advantage of capturing detailed features in the wake field, providing a reference for subsequent studies.