双向导流装置水轮机叶片半径和安装位置研究

RESEARCH ON BLADE RADIUS AND INSTALLATION POSITION OF BI-DIRECTIONAL DIVERSION DEVICE

由于水流在双向导流装置的中间段管道内流动时流速分布不均匀,导致水平轴水轮机发电效率受到影响。通过研究导流装置内部水轮机的叶片半径和安装位置,提高双向导流装置内部水轮机在双向水流中的发电效率。首先通过Fluent获取导流装置中心垂直截面的流速分布曲线,采用数值分析的方法建立流速分布数学模型,计算得到最优的叶片半径。再通过研究竖直方向上流速分布变化规律,得到最优的叶片安装位置。最后通过拖拽实验,获得双向水流下的周期发电功率。研究结果表明,当叶片半径位于流速分布的直线范围内时,水轮机叶片旋转面的流速较大,随着叶片安装位置下降,水轮机的叶片旋转面的流速明显增加。在水流流速为1 m/s时,调整水轮机叶片半径和安装位置后水轮机的发电功率较之前提高72%,较裸叶片的发电功率提高150%。

Due to the uneven distribution of flow velocity when the water flows in the middle section of the bidirectional flow guide device,affect the power generation efficiency of the horizontal axis turbine.By studying the blade radius and installation position of the turbine inside the guide device,improve the power generation efficiency of the turbine inside the two-way guide device in the two-way water flow.First,using Fluent to obtain the flow velocity distribution curve of the vertical section of the center of the diversion device.By means of numerical analysis,established the mathematical model of velocity distribution,and calculated the optimal blade radius.Then,by studying the variation law of flow velocity distribution in the vertical direction,obtained the optimal blade installation position.Finally,through the drag experiment,obtained the periodic power generation under the bidirectional water flow.The research results show that when the blade radius is within the linear range of the flow velocity distribution,the flow velocity of the rotating surface of the turbine blade is larger,and the flow velocity of the rotating surface of the turbine blade increases significantly as the blade installation position decreases.When the water flow velocity is 1 m/s,after adjusting the blade radius and installation position of the turbine,the power generation of the turbine is increased by 72%compared with the previous one,and the power generation by the bare blade is increased by 150%.