基于潮流能利用的变几何水轮机的水力性能研究

HYDRODYNAMIC RESEARCH ON VGT FOR MARINE CURRENT GENERATION

研究一种利用潮流能发电的变几何水轮机。通过采用动网格技术,计算该水轮机的水力性能。在分析诸如压力云图、速度云图、叶片表面压力分布以及叶片扭矩输出的基础上,对该水轮机做出综合评价。计算结果表明:变几何水轮机在一系列固定流量系数下具有优异的性能,入射流的动能可有效地转化为转子的动能。

A novel design of turbine for tidal current or fast-flowing stream was studied, which was called Variable Geometry Turbine （VGT）. The turbine consists of several flapping blades that are hinged on a revolving drum. Two- dimensional unsteady dynamic mesh CFD was used to obtain detailed information about the flow field, including pressure and velocity contours, pressure distribution on blade surface and torque output of blades. It is found that the turbine gives very satisfactory performance over a restricted range of flow coefficient. Under these conditions, the kinetic energy of the incident flow can be effectively transferred into the movement of the rotor, so that the average power coefficient can reach a satisfied value.