叶轮级数对一种潮流水轮机水动力性能的影响

Influence of Impeller Stage on Hydrodynamic Performance of a Tidal Turbine

为进一步提高潮流能水轮机叶轮的能量捕获性能(获能效率),对一种多级获能潮流水轮机叶轮进行了研究。利用ANSYS16.0中的CFX流体仿真模块对一种潮流水轮机的叶轮级数进行了数值计算,对不同级数的叶轮进行水动力性能模拟,考察一级、二级和三级叶轮在不同流速下呈现的速度、压力分布以及流场压差变化情况,并通过样机试验进行了验证。结果表明,叶轮级数的增加可以提高轮机对水流能量的捕获性能;就各个流速工况下的整体获能系数而言,三级叶轮最佳,但启动性能有所下降,三级叶轮启动流速在0.75 m/s左右;三级叶轮的最优水速在1.5 m/s左右,理想状态下获能效率可达51%上下。

In order to further improve the energy capture performance(capacitance efficiency)of tidal energy turbine impellers,a multi-stage energetic tidal turbine impeller is studied.The CFX fluid simulation module in ANSYS16.0 is used to numerically calculate the impeller stage of a tidal turbine.The hydrodynamic performance of the impellers of different stages is simulated.The impellers of the first,second and third stages are presented at different flow rates.The velocity,pressure distribution and flow field pressure difference are verified by prototype experiments.The results show that the increase of the number of impeller stages can improve the capture performance of the turbine water flow energy.For the overall energy dissipation coefficient under various flow conditions,the third-stage impeller is the best,but the starting performance is reduced,and the third-stage impeller starting flow rate At about 0.75 m/s;the optimal water speed of the three-stage impeller is about 1.5 m/s,and the energy efficiency can reach 51%.