Abstract
Horizontal and vertical axis wind turbines (HAWTs and VAWTs) are two main kinds of wind turbines, which are the most popular way to catch energy from the wind. By comparison, VAWTs have some advantages, but they also have the complexity in aerodynamics that needs a deep investigation. A code is developed based on Double multiple stream-tube and corrections of the dynamic stall for Darrieus VAWTs. It is capable of estimating the output power versus different operating conditions defined by the tipspeed- ratio. The code is also validated with experimental data of many SANDIA Darrieus VAWT turbines.
Highlights
Modern wind turbines are the primary devices to convert the wind’s momentum into rotor rotation thanks to a number of blades. They can be classified into two main categories according to their axis alignment: horizontal axis wind turbines (HAWTs) and vertical axis wind turbines (VAWTs)
The idea of Double multiple stream-tube model (DMST) model is the equilibrium of thrust forces act on a piece of the blade which calculated by momentum theory and blade element method
Results from the current study on estimating power coefficient of VAWTs based on DMST are analyzed in two steps
Summary
Modern wind turbines are the primary devices to convert the wind’s momentum into rotor rotation thanks to a number of blades. The model, which is the combination of momentum theory and blade element method, is a simple and efficient way to predict the output power of VAWTs quickly, compared to experimental and other numerical simulation methods. Paraschivoiu validated his results by many experimental and CFD results, presented in [2]. That a HAWT can be received is 0.5926 and called the Betz limit The model, even this limit, cannot be applied for VAWT; it is possible to develop another comparable method to simulate the flow through turbine by dividing the turbine into many stream-tube. The results are validated with some experimental data of existing VAWTs
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