水平轴潮流能发电系统能量捕获机构研究

Research on the Energy Capture Device of Horizontal Axis Tidal Current Energy Conversion Systems

能量捕获机构是水平轴潮流能发电系统的关键部件。在叶素动量理论的基础上设计三叶片结构的潮流能透平装置,采用变速运行的最优叶片设计方法设计叶片的几何特性,在考虑必要的模型修正后建立水动力学性能预测的数字模型,对捕能装置在不同安装角下的性能进行理论预测。预测结果显示捕能装置的水动力学设计是有效的。在实际海况下对捕能装置进行测试,试验结果显示捕能装置工作正常,设计尖速比附近的功率系数达到0.341,验证捕能装置设计方法的有效性。将试验结果与理论预测进行对比发现试验值略低于理论值,但两者总体上比较一致,验证数字预测模型的正确性和有效性。

Energy capture device is the key component of the horizontal axis tidal current energy conversion system.Based on blade element momentum theory,a three bladed tidal current turbine is designed and tested.The blade geometry is determined by using the optimal blade design method for variable-speed operation.A hydrodynamic performance prediction model including necessary modifications is established,with which the turbine performance for various blade pitch angles is predicted.The prediction results suggest that the hydrodynamic design of the turbine is valid.Then the turbine is constructed and tested under real offshore conditions.Experimental results show that the turbine functions well and the power coefficient around the design point reaches 0.341,thus validating the effectiveness of the turbine design method.A comparison is made between experimental results and theoretical predictions.Although the experimental data is slightly lower,it is generally consistent with those derived from the model.Hence,the correctness and validity of the numerical prediction model are proven.