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以所研发的25 k W水平轴海流能发电机组为对象,分别通过基于叶素动量(BEM)理论的GH-Bladed软件分析方法和基于有限元建模(FEM)理论的计算流体力学(CFD)数值模拟分析方法,对水平海流发电机组的水动力学性能进行理论分析及软件建模,并对两种分析方法的结果进行对比讨论。分析结果表明,海流流速在机组额定流速附近时,两种方法得到的机组能量捕获效率和推力系数均较接近。当海流流速较高于机组额定流速时,两种方法得到的结果出现明显差异,差异的原因在于CFD方法考虑了海流沿叶轮半径方向的径向流动,而BEM方法未考虑此因素。两种方法的比较研究为水平轴海流能发电机组水动力载荷的后续试验研究提供了理论依据。
Based on the developed 25 kw horizontal axis current power generation unit, GH-Bladed software analysis method based on BEM theory and computational fluid dynamics (CFD) theory based on finite element modeling (FEM) Numerical simulation analysis method is used to make theoretical analysis and software modeling of hydrodynamic performance of horizontal ocean current generating units. The results of the two analysis methods are compared and discussed. The analysis results show that the efficiency and thrust coefficient of the unit obtained by the two methods are close to each other when the flow velocity of the ocean is near the rated flow velocity of the unit. The results obtained by the two methods show significant differences when the flow velocity is higher than the rated flow velocity of the unit. The reason for the difference is that the CFD method considers the radial flow along the radius of the impeller, while the BEM method does not consider this factor. The comparative study of the two methods provides a theoretical basis for the follow-up experimental study on the hydrodynamic load of horizontal axis current-flow generating units.