Numerical investigation of the influence of blade helicity on the performance characteristics of vertical axis tidal turbines

流入 涡轮机 扭矩 机械 计算流体力学 潮汐能 风力发电 垂直轴风力涡轮机 功率(物理) 叶尖速比 海洋工程 物理 工程类 机械工程 空气动力学 电气工程 热力学 量子力学
作者
Philip Marsh,Dev Ranmuthugala,Irene Penesis,Giles Thomas
出处
期刊:Renewable Energy [Elsevier BV]
卷期号:81: 926-935 被引量:63
标识
DOI:10.1016/j.renene.2015.03.083
摘要

Previous research has shown that helical vertical axis turbines exhibit lower torque fluctuation levels than straight-bladed turbines; however little is known of the impact of blade helicity on turbine performance characteristics. To investigate these relationships the hydrodynamic characteristics of straight and helical-bladed vertical axis turbines were investigated using Three-Dimensional (3D) Computational Fluid Dynamics (CFD) models using a commercial Unsteady Reynolds Averaged Navier-Stokes (URANS) solver. Simulations of power output, torque oscillations, and mounting forces were performed for turbines with overlap angles from 0° to 120° and section inclination angles from −15° to 45°. Results indicated that straight-bladed turbines with 0° blade overlap generated the highest power output. Helical turbines were found to generate decreasing power outputs as blade overlap angle increased due to the resultant blade inclination to the inflow. Blade section inclination to the inflow was also found to influence power output. Some benefits of helical-bladed turbines over their straight-bladed counterparts were established; helical turbine torque oscillation levels and mounting forces were reduced when compared to straight-bladed turbines. For both straight and helical-bladed turbines maximum mounting force levels were found to exceed the average force levels by more than 40%, with large cyclical loading forces identified.
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