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首页> 外文期刊>International Journal of Mechanical Engineering Education >An experimental study of a collector and diffuser system on a small demonstration wind turbine
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An experimental study of a collector and diffuser system on a small demonstration wind turbine

机译：小型示范风机的集散系统实验研究

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摘要

A diffuser-augmented wind turbine (DAWT) has been an attractive concept of wind energy extraction since the early 1970s, due to the system's ability to increase the power generated by a regular bare turbine of the same size. However, the DAWT needs to reach a minimum augmentation ratio of 4 in order to become economically feasible. This paper investigates the possible improvement of a DAWT system by adding a collector fuselage to increase its augmentation ratio. Testing using a small experimental unit shows that adding a collector increases the power augmentation of the DAWT by more than 50%, and increases the mass flow rate through the turbine by increasing the effective upstream area of the wind that enters it. Changing the angle of the incident wind on a collector- and diffuser-augmented wind turbine (CDAWT) shows that it is possible to capture the energy in the wind up to an angle of 71°. Moreover, the CDAWT can keep extracting wind energy, without any diminution of the augmentation ratio, as wind direction varies +45° from the turbine axes, thus eliminating the requirement for a yaw mechanism. Hence, the variant wind direction has a positive effect on the augmentation ratio.
机译：自1970年代初以来，扩压器增强型风力涡轮机（DAWT）一直是风能提取的一个引人注目的概念，这是因为该系统具有增加相同尺寸的常规裸机产生的功率的能力。但是，DAWT必须达到最小增强比率4才能在经济上可行。本文研究了通过添加集热器机身以增加其增强比例的DAWT系统的可能改进。使用小型实验装置进行的测试表明，添加收集器会使DAWT的功率增加超过50％，并通过增加进入涡轮的有效上游面积来增加通过涡轮的质量流率。改变收集器和扩散器增强型风力涡轮机（CDAWT）上入射风的角度，可以捕获高达71°的风中的能量。此外，由于风向与涡轮机轴线成+ 45°变化，因此CDAWT可以继续提取风能，而不会增加比例，因此无需偏航机构。因此，变化的风向对增加率具有积极影响。

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