水平轴式海流发电装置的设计研究

Study on design of horizontal-axial marine current power generation device

为了提升海流能发电装置的的能量转换效率,研发了一种水平轴式S形叶轮海流发电装置。采用升力法设计叶轮结构,建立CATIA模型并开发了模具,以便于大规模的加工叶轮。设计了9槽8极绕组水下防腐永磁发电机,并进行了发电机系统结构的设计。导流罩的线性选择使得海流速度增加14%~23%,但流速过大又造成了装置不稳定。通过工程样机海上试验,验证了永磁发电机的发电性能,同时检测了发电装置实验阶段的防水及防腐效果。轮机在流速达到0.32 m/s时即实现无负载自起动。在海水流速为2.5 m/s时,轮机的获能功率可达到1 150 W;在海水流速为2 m/s左右的海况下,轮机的实际获能功率在900 W上下,获能效率最高为32%,提高了能量的转换效率。

In order to enhance the energy conversion efficiency of marine current power generation device,a horizontal-axial marine current power generation device equipped with S-shaped impeller is developed. The impeller structure is designed with lifting-line method,for which CATIA model is established and the relevant mould is developed,so as to manufacture the impeller on a large scale. A 9-slot/8-pole winding under-water connective anti-corrosive permanent magnet generator is designed,while the design of the structure of the generator system is made as well. The linear selection of the guide diffuser makes the current velocity increased by 14% ~ 23%,but the over-large velocity makes the generation device instability. Through the marine experiment of the engineering prototype,the generating performance of the permanent magnet generator is verified,while the water proof and anti-corrosive effects of the generation device during the experimental phase are tested as well. The no-load self-starting of the turbine for the power generation is realized at a flow rate of 0. 32 m/s. When the seawater flow rate is 2. 5 m/s,the energy-yielding power can reach to 1 150 W,while the actual energy-yielding power is to be about 900 W under the sea state with the seawater flow rate of about 2 m/s,of which the maximum energy-yielding efficiency is 32%,and then the energy conversion efficiency is enhanced.