竖轴固定直叶片潮流水轮机自启动性能研究

Study on the Self-starting Performance of the Fixed Straight-bladed Vertical Axis Tidal Turbine

竖轴固定偏角直叶片潮流水轮机具有结构简单、系统稳定可靠、造价低的特点,具有广阔的应用前景。但是由于该机构在水流场中的自启动能力较差,低流速下很难启动,故在实际工程应用中有着明显的劣势。提高竖轴固定叶片水轮机自启动性能是目前研究的重点。本文根据叶片在流场中的水动力特点,利用数值模拟的方法在CFD中计算了不同流速下,叶片在不同位置时的自启动性能,同时计算出加装叶栅附体的水轮机的自启动性。进行对比后,得出加装叶栅附体可以提高水轮机自启动性能。初步总结了在设置不同角度、栅距后,不同类型的叶栅对水轮机自启动性能的影响。

The fixed pitch straight-bladed vertical axis tidal turbine has great prospect for the features of simple structure,stabilizing system,low cost.The self-starting performance of the tidal turbine is poor,and it is difficult to work under low flow,so it has a clear disadvantage in practical engineering.Improving self-starting performance of turbine becomes considerable hot point and overcoming emphasis in recent years.The paper use CFD to calculate leave of self-starting performance with numerical simulation method in different velocity and different locations,as the leave of hydrodynamic characteristic in the flow field,meanwhile it calculate self-starting performance of turbine with guide vanes.The Results are compared with that of the tidal turbine with cascade possessed,which shows the guide vanes can improve the self-starting performance of the fixed pitch straight-bladed vertical axis tidal turbine.After setting the different angles and different distances,preliminary summarizes the different types of blades impacting on self-starting performance of turbine.