There are many advantages of vertical axis wind turbines (VAWTs) compared with horizontal axis wind turbines (HAWTs). Research has shown that VAWTs are more suitable for turbulent wind flow and urban applications. However, the efficiency and low self-start ability of VAWTs are always the main drawbacks especially for the lift-type VAWTs. Unlike HAWTs, the rotor blades for VAWTs do not always provide positive torque during operation. Many innovative designs have been implemented to improve the performance of VAWTs, and this includes different configurations and blade profiles. This paper extensively reviews various flow augmentation systems and attempts to provide information to researchers on current augmentation techniques and other relevant research. The flow augmentation system is able to increase the coefficient of power, CP, hence improving the output power of different types of VAWTs. Some augmentation systems are able to increase the maximum power output by up to 910%. The methods and designs used to increase upwind velocity and to reduce negative torque created on the wind turbine have been discussed in detail. Additionally, the flow augmentation devices that are integrated with building structures are also reported in this paper.

Performance enhancements on vertical axis wind turbines using flow augmentation systems: A review

An improved seasonal GM(1,1) model based on the HP filter for forecasting wind power generation in China

Short-term forecasting and uncertainty analysis of wind power based on long short-term memory, cloud model and non-parametric kernel density estimation

CFD-based improvement of Savonius type hydrokinetic turbine using optimized barrier at the low-speed flows

Echo state network based ensemble approach for wind power forecasting

Analysis and optimal design of wind boosters for Vertical Axis Wind Turbines at low wind speed

Robust short-term prediction of wind power generation under uncertainty via statistical interpretation of multiple forecasting models

CFD-Based Power Analysis on Low Speed Vertical Axis Wind Turbines with Wind Boosters

Nyquist-based adaptive sampling rate for wind measurement under varying wind conditions

Although Vertical Axis Wind Turbines (VAWTs) are designed for performing mechanical works acceptably at medium wind speed, Standalone VAWTs are still unable to generate mechanical power satisfactorily for best practice at low speed wind. This study presents optimal design of wind booster, by utilizing Computational Fluid Dynamics (CFD). A wind booster is proposed to be implemented with a VAWT in order to not only harvest energy with low availability at low wind speed but also enhance performance of a VAWT at higher wind speed. In CFD-based experiments, guiding and throttling effects of the wind booster are able to increase mechanical power of a VAWT. Optimal alternatives of number and leading angle of guide vanes are determined by maximizing the coefficient of power from the alternating direction method as an optimization technique. The VAWT coupled with the optimal wind booster, which consists of 8 guide vanes and leading angle of 55o, is cable of producing mechanical power higher up to the coefficient of power of 4.8 % than the original design.

Optimal Design of Wind Boosters for Low Speed Vertical Axis Wind Turbines

Natapol Korprasertsak

Papers

Analysis and optimal design of wind boosters for Vertical Axis Wind Turbines at low wind speed

Robust short-term prediction of wind power generation under uncertainty via statistical interpretation of multiple forecasting models

CFD-Based Power Analysis on Low Speed Vertical Axis Wind Turbines with Wind Boosters

Nyquist-based adaptive sampling rate for wind measurement under varying wind conditions

Optimal Design of Wind Boosters for Low Speed Vertical Axis Wind Turbines