用于潮流能双向发电的导流装置性能研究

Study on the performance of the diversion device of tidal current bidirectional generation

为解决受叶片翼型的影响而导致发电设备在一个潮流周期内平均效率下降的问题,提高发电设备总的输出功率,对一种可将潮流双向流动转换为单向流动的双向导流装置进行了研究分析。首先,建立了发电装置输出功率的数学模型,采用数值分析的方法研究了圆角半径对双向导流装置内部流场、阻力系数k、流速比以及水轮机输出功率的影响,随后进行水下拖拽试验,测试双向导流装置的实际效果。研究结果表明:当R<1.4 l时,增大过渡圆角半径有利于降低流动阻力损耗,改善流速分布不均的情况,提高双向导流装置的性能。在相同负载条件下,潮流流速为1 m/s时,加装双向导流装置后,负载上的平均电功率比裸叶片提高了79%。双向导流装置能够避免潮流反向带来的负面影响,显著提高发电设备在一个潮流周期内的平均输出功率。

In order to solve the problem that the average efficiency of power generation equipment decreases in a tidal current cycle due to the influence of blade airfoil,and to improve the total output power of the generation equipment,a bidirectional diversion device that can convert the two-way flow of tidal current into one-way flow was studied.First,the mathematical model of the output power of a generation device was established,and the influence of the fillet radius on the internal flow field,resistance coefficient k,flow rate ratio of the bidirectional diversion device and the output power of the turbine were studied by numerical analysis.Then,the underwater test was carried out to test the actual performance of the bidirectional diversion device.The results showed that when R<1.4 l,the increase of the radius of the transition fillet was conducive to reducing the flow resistance loss,improving the velocity distribution and enhancing the performance of the bidirectional diversion device.Under the same load,when the current velocity was 1 m/s,the average electric power of the load increased by 79%compared with that of bare blade.It indicates that the installation of bidirectional diversion device can avoid the negative effect of the reversed flow of tidal current and significantly improve the average output power of equipment in a tidal current cycle.