卧式海流发电装置叶轮特性仿真研究

Numerical Simulation of the Hydrodynamic Characteristics of a Horizontal Ocean Current Power Generation Device

基于上海海洋大学研制的卧式海流能发电装置,在对叶片受力进行分析的基础上,采用雷诺平均N-S方程和滑移网格技术,对不同工况下的叶轮运动进行了数值模拟,获得了力矩系数、能量转换效率及功率等性能参数。通过分析比较不同工况下的各性能参数的变化规律,发现叶轮运动具有周期性,一个周期内的相邻极大、极小值之间相差72°相位角;随着海流速度和叶轮转速的增大,输出功率逐渐增大;而力矩系数和能量利用效率却呈现先增大后减小的趋势,在海流速度v=1.5 m/s,尖速比λ=2.46时,能量转换效率最大,可达到34.6%,输出功率为373 W,并与海试结果进行了对比分析。

The performance of the horizontal ocean current power generation device developed by Shanghai Ocean University is simulated under different conditions. In this paper, the forces of blade are studied and the Reynolds averaged N-S equations and sliding mesh technique are employed, so as to obtain the performance parameters,including torque coefficient, energy conversion efficiency and power. Through analyzing their change rules, it is found that the movement of impeller is periodic. In one period, the difference between the adjacent maximum and minimum values is 72° of the phase angle. With the increase of current velocity and impeller speed, the output power gradually increases. On the other hand, torque coefficient and energy conversion efficiency show a tendency of firstly increasing and then decreasing. Besides, the maximum value of energy conversion efficiency,up to 34.6%, appears at the flow rate of 1.5 m/s and the tip speed ratio of 2.46, with the output power of up to373 W. Furthermore, the differences between the numerical and experimental results are compared and analyzed.