海浪发电机双向轴流叶轮设计与仿真分析

Design and simulation analysis of axial-flow reversible impeller of wave generator

为了使海洋浮标具备正常的定位及监测功能,需要合理地进行双向轴流叶轮的选型分析。采用软件对翼型进行选择,并通过Fluent软件对翼型进行水动力仿真分析,由压力云图得到影响流体动力性能的主要因素是前半段的弧线。基于此设计S翼型,进行UG建模,并通过接口导入Fluent软件进行叶轮仿真,以选定叶片数量。采用叶素动量理论(BEM)对海流能自供电浮标叶轮翼型进行原理分析,建立Bladed模型,仿真得到叶轮输出特性,从而验证了水动力仿真的正确性。通过模拟试验平台对所设计叶轮的可行性进行验证。结果表明:桨距角为15°,尖速比为4,叶片数量为4的叶轮在流速2.2 m/s下获能效率最大,其数值接近40%。通过对仿真及理论分析的正确性进行验证,能够为之后的水槽及海试试验提供数据参考。

In order to make marine buoy have normal positioning and monitoring functions,the selection of axial-flow reversible impeller must be reasonably analyzed. The impeller airfoil is selected with the software——Profili,and then a hydrodynamic simulation is made on the airfoil through the software——Fluent; from which the main factor to affect the hydrodynamic performance obtained from the relevant pressure cloud image is the first half of the arc. On the basis of this,the S-typed airfoil is designed;for which UG modeling is made and the impeller is simulated by introducing Fluent through the interface,so as to choose the number of the blade. Based on the blade element momentum（ BEM） theory,the principle of the impeller airfoil of the marine current energy self-powered buoy is analyzed and the Bladed model is established,while the output characteristics of the impeller is obtained from the simulation,thus the correctness of the hydrodynamic simulation is verified. Through the simulation test platform,the feasibility of the designed impeller is demonstrated. The result shows that the energy-capturing efficiency of the impeller with the pitch angle of 15,tip-speed ratio of 4 and blade number of 4 is the highest under the flow rate of 2. 2 m/s,of which the value is close to 40%. Through the verification of the correctnesses of both the simulation and the theoretical analysis,the relevant data reference can be provided for the flume and marine tests in the days to come.