用于双向水流发电的导流罩增速性能研究

为提高水平轴水轮机用于双向水流发电时总输出功率, 对一种导流罩的增速性能进行了研究. 以流速比作为导流罩的性能指标, 利用有限元仿真计算不同几何参数时导流罩流速比且对其进行优化, 分析了增速导流罩的安装对水平轴水轮机双向发电性能的影响, 并通过水下拖拽发电试验对仿真优化后的导流罩性能加以验证. 结果表明 增速导流罩长度和角度是影响其性能的关键因素, 在导流罩长度保持不变时, 随着导流罩角度的增加, 流速比呈现先增后减的变化趋势; 当水流速度为1m·s-1时, 加装增速导流罩后发电装置的双向发电功率提高了37%.

Study on shroud speed increasing in a two-way flow power generation

In order to improve the total output power of horizontal axis turbine when it is used in two-way water flow power generation, the speed increasing of a shroud is studied. Through the simulation of the flow rate ratio of the shroud under different geometric parameters, the effect of the installation of the speed increasing shroud on the power generation is analyzed and optimized, and finally the optimization results are verified by the underwater drag test. The results show that the length and angle of the speed increasing shroud are the key factors. When the length of the shroud remains unchanged, with the increasing of the shroud angle, the flow rate ratio increases at first and then decreases. When the water flow velocity is 1m·s-1, the two-way flow power generation efficiency is increased by 37% after installing the shroud.