水平轴潮流能水轮机复合材料叶片自适应性研究

Study of Adaptivity of Composite Material Blades Used in Horizontal Axis Tidal Hydraulic Turbine

叶片是水轮机中潮流能向机械能转化的核心部件,直接影响水轮机的水动力性能和结构性能。以水平轴潮流能水轮机复合材料叶片为例,基于复合材料弯扭耦合理论,采用双向流固耦合方法研究了叶片的自适应性。结果表明,采用对称铺层方式的复合材料叶片,可提高水轮机的能量利用率,并在较大的速比范围内使水轮机保持较高的效率;降低叶片上的应力集中,可改善结构性能;对称铺层可利用叶片的弯扭耦合特性,使叶片具备自适应性,从而提高水轮机的水动力性能和结构性能。

Blade is the core component of water turbine in conversion of tidal current energy to mechanical energy,which directly affects the hydrodynamic performance and structural performance of the hydraulic turbine.Based on the bend-twist coupling theory of the composite material,taking the composite material blades used in the horizontal axis tidal hydraulic turbine as an example,the two-way fluid solid coupling method was used to study the adaptivity of blades.The results show that the composite material blades with a symmetry layer can improve the energy utilization rate of water turbine,and allow the turbine to maintain a high efficiency in a large range of speed ratio;it reduces the stress concentration on the blades while ensures the turbine structural performance.The bend-twist coupling effect happened in the composite material blades with symmetry layer makes blade adaptivity.So,it improves hydrodynamic and structural performances of the hydraulic turbine.