计及叶片载荷的双机对转式海流发电机系泊系统动力分析

本文设计了一种新型的双机对转式海流发电机并对其系泊系统与叶片载荷和直径关系进行模拟分析。首先将单机式海流发电机与已有研究进行对比验证其可靠性，然后在不改变系泊方式的前提下，设计出双机式结构，并通过分析机身位移和旋转比较两种系统的稳定性。为考虑叶片载荷对系泊系统影响，在Orcaflex中对不同精细程度的叶片进行建模，分别对比单一翼型/三翼型/九翼型的数值模拟结果。接着使用M-BEMT软件优化后的翼型参数，对比使用原始升阻力系数的三翼型发电机的模拟结果，同时将使用不同直径叶片的发电机系统进行对比，说明双机式发电机的稳定性更优，对海流发电机及其系泊系统的设计提供重要参考价值。

Mooring dynamics analysis for a floating current turbine accounting for the blade forces

The research presented in this paper brings out a moored twin-MCTs design and analysis of blade loads affected mooring system hydrodynamics. Firstly, a twin counter-rotating turbine system and a normal ocean current turbine system, using NACA63818 hydrofoil, are modelled and simulated in Orcaflex. Then to take blades loads into consideration, a twin counter-rotating turbine system, with specific-sized rotor, was modelled in Orcaflex. Different hydrofoils from NACA 63XXX foil family are used to build rotor model. Considering that Orcaflex uses Blade Element Method to calculate rotor performance which is not accurate enough and not timely adjustable, to better predict the performance of MCT in less computation cost and predict accurate mooring dynamics and displacement, a combination has been given between Orcaflex and in-house code M-BEMT, written in Matlab. Finally, the results of mooring line effective tension and turbine body motions are compared. The whole moored MCT system was evaluated in a dynamic environment to give suggestions to design proper mooring system.