A study on aerodynamic characteristics and visualization of flow field of lift-drag combined starter

Fang Feng,Yan Li,Xiaoyu Dong,Guoqiang Tong,Yuedi Bai

doi:10.1177/1687814019846233

Abstract

This study refers to the modification of the aerodynamic characteristics of the starter for the lift-type vertical axis wind turbine, the structure of the traditional drag starter was improved, and the lift-drag combined starter model was proposed. Based on the CFD numerical simulation and the particle image velocimetry visualization test, the aerodynamic characteristics of the lift-drag combined starter model and the drag starter model are studied, and the reasons for the regular variation of the flow field are explained. The results show that the lift-drag combined starter has obvious advantages over the traditional drag starter in both static start-up characteristics and dynamic output characteristics. The average static torque coefficient of the lift-drag combined starter is increased by 8% compared to that of the drag starter after one revolution. The increasing percentage of the maximum dynamic moment coefficient of the lift-drag combined starter is 89% compared to the drag starter, and the decreasi...

Highlights

Wind energy is considered as the most rapidly growing clean-energy source in the field of renewable energy resources.[1]
The static starting characteristics were primarily studied to determine the minimum torque required to overcome its internal frictional drag during static starting of a wind turbine. This minimum torque value is termed as static starting torque of the wind turbine and static torque coefficient of a wind turbine without dimension denoted by Cts
The static torque coefficients of lift-drag combined starter (LDCS) and drag starter (DS) showed a similar trend at the azimuth angles lies in 0°–180°, but at the range of 100°\ u \ 140°, the static torque coefficient of DS is significantly larger than that of LDCS while the static torque coefficient of LDCS was higher than that of DS at the remaining azimuth angles

Summary

Introduction

Wind energy is considered as the most rapidly growing clean-energy source in the field of renewable energy resources.[1]. Keywords Vertical axis wind turbine, lift-drag combined starter, aerodynamic characteristics, flow measurement, numerical simulation

Results

Conclusion