Effect of a diffuser on the power production of Oce an Current Turbines
Effect of a diffuser on the power production of Oce an Current Turbines
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发表时间：
2010
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通讯作者：
J. Reinecke
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作者：
J. Reinecke
洋流涡轮机(OCT)是一种水力涡轮机，涉及从洋流中提取动能。与其他可再生能源相比，海洋流资源有一个重大优势，因为它基本上是非间歇性的，在很长一段时间内都是可预测的。本研究的目的是研究现有的模型海流水轮机采用几何优化的曲板扩散器来提高功率密度。设计了面积比为3.29的单曲板扩散器。通过将扩散器形状描述为由四个变量定义的B-样条线。创建了一个二维CFD分析，作为拉丁超立方体设计实验的功能评估。利用DOE构建了支持向量回归元模型，并对其进行了优化。模型预测的最大导叶功率为1.672。导叶在拖曳水池中以1.5m/S的速度进行了试验，结果表明，采用优化后的导叶，涡轮峰值功率从裸机的383W(CP=0.43)提高到实测值1512W(CP=1.74)。这意味着发电量增加了4.05倍。
Ocean current turbines (OCTs) are hydropower turbines that involve the extraction of kinetic energy from ocean currents. The marine current resource has a major advantage over other renewable energy resources in that it is essentially non-intermittent and predictable over long time periods. The purpose of the study is to investigate the increase in power density of an existing model ocean current turbine, by use of a geometrically optimized curved plate diffuser. A single curved plate diffuser with area ratio of 3.29 was designed. By characterizing the diffuser shape as a B-spline defined by four variables. A two-dimensional CFD analysis was created as function evaluations for a Latin Hyper Cube Design of Experiments. A Support Vector Regression metamodel was constructed from the DOE and optimized. The model predicted a maximum Cp of 1.672.The diffuser was manufactured and tests conducted in a towing tank facility at a flow speed of 1.5m/s. Results showed an increase in turbine peak power from 383 W (Cp =0.43) for the bare turbine to a measured 1512 W (Cp = 1.74) for the turbine with the optimized diffuser. This represented an increase in power production by a factor of 4.05.