支撑结构对实尺度潮流能水轮机性能影响研究

Research on the Influence of Support Structure on Performance of Full-scale Tidal Turbine

潮流能水轮机在实际运转时,水轮机叶片性能会受到其支撑结构的影响。以带变桨距系统的50kW水平轴潮流能水轮机为研究对象,选择采用CFD方法,使用Code_Saturne软件对处于不同工况下的实尺度潮流能水轮机进行数值仿真,研究支撑结构对潮流能水轮机性能的影响规律。研究结果表明,当50kW潮流能水轮机工作于1.5m/s流速时,正向迎流工况下支撑结构对水轮机的影响较小,但反向迎流工况下支撑结构对水轮机的影响非常剧烈,单一叶片划过支撑结构尾流区域时轴向力衰减约22.4%,升力衰减约91%,转子整体轴向力波动约为7%,整体获能效果衰减约31%。本文同时为实尺度潮流能水轮机的性能预测提供一种研究方法。

The presence of support structure may affect the performance of turbine’s blade when tidal turbines are in operation.Taking the 50kW horizontal-axis tidal turbine with variable pitch system as the research object,the full-scale tidal turbine under different working conditions was simulated by Code_Saturne(CFD method),and the influence of support structure on the performance of tidal turbine was studied.The research results showed that the support structure has less influence on the turbine under forward inflow conditions when the 50kW tidal turbine is operating at a flow rate of 1.5m/s.However,the support structure has severe impacts on the turbine under reverse inflow conditions.When the single blade is in the wake of the support structure,the decrease of its axial and lift force is 22.4%and 91%,respectively;the total axial force of the rotor fluctuates by approximately 7%,and captured energy of the turbine decreases by approximately 31%.This paper also provided a research method for the prediction of full-scale tidal turbine’s performance.