Experimental and Numerical Assessment of Cross Flow Vertical Axis Wind Turbine

垂直轴风力涡轮机 叶尖速比 涡轮机 扭矩 机械 风速 涡流 风力发电 流量(数学) 高超声速风洞 风洞 海洋工程 物理 环境科学 工程类 气象学 航空航天工程 电气工程 热力学
作者
S. Seralathan,Micha Premkumar Thomai,Rian Leevinson Jayakumar,Basireddy Venkata Lokesh Reddy,V. Hariram
标识
DOI:10.1115/gtindia2019-2427
摘要

Abstract Due to increase in energy demand along with environmental awareness, the attention is shifting towards renewable energy sources. A wind turbine developed from Banki water turbine is used in this study as it starts at low-wind speeds and has high starting torque. Experimental investigations are carried out on a test rig equipped with open jet wind tunnel with wind velocity varying from 7 to 11 m/s. Later, 3D steady-state numerical analyses are performed using ANSYS CFX for better understanding of the flow physics of cross flow VAWT. The experimental investigations revealed that cross flow VAWT has a good self-starting ability at relatively low-wind speeds. A peak power coefficient (Cp, max) value of 0.059 is observed for the tip speed ratio (λ) of 0.30. As the tip speed ratio is raised further, the Cp value is observed to decrease gradually. The numerical simulations reveal the reason for the drop in Cp value. This is due to lessening of positive interaction between the flow and cross flow VAWT blades at higher λ due to vortex formation. The torque coefficient is found to decrease almost linearly from a peak value of around 0.49 at λ = 0 to a value of 0 around λ = 0.60. Polar plot between angle and torque shows that torque output of the turbine is nearly same in all directions which reinforce the potency of cross flow VAWT to be omni-directional as it produces the same performance regardless of wind directions.
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