海流发电装置轴向力分析及液压平衡装置设计

Axial Thrust Analysis of Ocean Current Turbine and Design of Hydraulic Equilibrator

针对水平轴螺旋桨式海流能发电装置正常工作时轴向力很大的问题,运用流体力学理论、叶元动量理论及流固耦合模拟的方法,对叶片受力进行分段求解再叠加计算出轴向力。计算的轴向力与数值模拟仿真结果较好地吻合。理论分析和仿真计算表明水流流速的变化及流固耦合使轴向力呈随机非线性变化。根据轴向力规律性变化的特点,设计一种新型的液控式轴向力自动平衡装置,在Bladed和AMESim软件中建立系统联合仿真模型并进行研究,结果表明该液控平衡装置可以较好地抵消水流引起的轴向力波动,从而可以保护轴承结构。

In view of problems of very big axial thrust caused by the flowing water during the operation of ocean current turbines, hydrodynamics, blade element momentum and fluid-solid coupling simulation methods are used to calculate the thrust force by solving subsections of the blade and addition of them. The calculation results are compared with the simulation results in Bladed software and both prove that variation of water velocity and fluid-solid coupling cause the random nonlinear variation of the axial force. According to the characteristic of the regular change of axial thrust, a novel hydraulic equilibrator for axial thrust is designed, and its system model is constructed in AMESim and Bladed software are studied. The results show that the hydraulic equilibrator can well counteract the fluctuation of axial thrust, thereby protecting the bearing structure.