中文摘要：

基于达朗伯原理建立了自由变偏角水轮机结构动力学模型，并结合粘性CFD方法，形成了一种用于分析自由变偏角潮流能水轮机水动力特性的多体耦合数值计算方法。将该方法与试验及非耦合算法进行了对比分析，并研究了自启动、流速变化和负载变化对水轮机性能的影响规律。研究表明：本文建立的数值计算方法能够有效模拟自由变偏角水轮机在各种非定常过程中的运动特性和动力特性。

英文摘要：

A structural dynamics model for free variable-pitch vertical axis tidal turbine was established based on D＇ Alembert principle. Combining this model with viscous CFD method,a multi-body coupling numerical method for analyzing the hydrodynamics of free variable-pitch vertical axis tidal turbine was developed. Coupling algorithms results were compared with experiment results and non-coupling algo- rithms results,and the effect of self-starting,flow velocity, and load on the performance of the turbine were investigated. Studies have shown that： the developed algorithms can simulate the kinematical characteristics and dynamic characteristics of free variable-pitch vertical axis tidal turbine effectively in all kinds of unsteady process.