潮流冲击物理过程的有限元建模与仿真分析

Finite Element Modeling and Simulation Analysis on the Physical Process of Impact by Current

潮流冲击物理过程是一非线性动态冲击的复杂物理过程,了解该冲击作用过程并明确冲击压力、流速等物理量的变化规律对设计高效潮流能利用装置具有十分重要的作用。以开发的新型潮流能利用装置为对象,研究了潮流冲击物理过程的有限元建模与仿真技术,并在此基础上,对潮流冲击物理过程进行了仿真分析,获得了旋转叶片机构和导流箱零部件的受力等高线图、压力云分布图、水流速度矢量图和水流轨迹图。研究表明:叶片正面受力不均匀,支柱近端所受压力较大,而叶片的反面受力较为均匀;水流冲击叶片后成发散状,并贴着叶片向边缘处流动;导流箱外侧所受压力高于内侧,箱体上的水流分布从外到里不断增多,水流速度不断增大,具有明显的聚流增速作用。

The physical process of impact is a very complex process,which has typical nonlinear and dynamic impact charac-teristics. It is very important for the design of efficient current energy installations to analyze the impact process and master thechanging rule of the impact pressure and velocity. Taking the new current energy installaions as the object,the finite elementmodeling and simulating of the physical process of impact by current are studied. Furthermore,the physical process of impactby current is simulated and analyzed,and the contour map of force,the cloud picture of stress distribution,the diagram of wa-ter flow velocity vector and the diagram of water flow trajectory for spinning blade mechanism and guiding box are obtained.The studies have shown that the force in front of blade is uneven,and the force of one end near pillar is bigger,but the forcein reverse side is even. The flow becomes divergence after dashing the blade,flowing to the edge of blade. The pressure out-side of guiding box is higher than inside,and the flow in guiding box increases from the outside to the inside,also the flowspeed increases continuously,which shows the obvious role of collecting flow and adding speed.