低流速水流小型发电机CFX数值仿真及样机研制

Development of Mini-Generator in Low Velocity Water Flow Based on CFX Numerical Simulation

针对在低流速水流中捕获水流能并转化为电能输出的问题，采用ANSYSCFX流体力学仿真软件运用数值模拟的方法，建立发电机桨叶与水体的流固耦合模型，计算分析不同水流流速下的发电机桨叶的表面的压力，从而获取主轴的转矩值和理论转速，在此基础上完成发电机主要部件的选型、结构设计和试制工作。低流速水流小型发电机样机经加工现场水密测试、船模实验室测试和航标标志船现场测试等多项试验，样机水密性能良好，能够在较低水流流速下启动工作，实测启动流速为0．6m／s，该流速下样机的输出平均功率为1．28W。

Focusing on the problem of getting the hydroelectric power from low velocity water flow and transforming into elec- trical energy, the numerical simulation was carried out in Ansys CFX to analyze the surface pressure of the generator blades under different velocity flow. The fluid-solid coupling model of the mini-generator blade and water was established to calculate the spin- die torque and theoretical speed. Based on numerical results, the structural design and prototype of the mini-generator in low ve- locity water flow was completed. Experimental results showed that the mini-generator prototype in low velocity water flow has good performance of watertight, it can start work at a low velocity flow; the flow rate of startup speed for the prototype is 0.6 m/s, and the average output power of the prototype is 1.28 W.