Evaluation of a vertical axis wind turbine H-shape using double multiple stream tube model and corrections

The present work aims to study and development a modelling tool for the load and performance prediction of H-shape vertical axis wind turbines. In order to do so, a full understanding of the fluid dynamic behaviour involved is necessary, and the theory behind it is presented. Due to the complexity of the phenomena involved, some mathematical models are proposed in literature being the Double Multiple Stream Tube one of the most important. The basic formulation of the DMST, unfortunately, cannot represent well the real behaviour of the machine observed during experimental campaigns and additional corrections to the model are necessary. Some of the corrections proposed and used in this word are: dynamic stall, flow curvature, finite blade length, effect of struts, Glauert correction. This work focus on the mathematical implementation of the theory proposed in MATLAB code, and basically consider a main computational structure that activate the necessary corrections and give all the aerodynamic parameters of interest for the H-shape machine. The importance of this approach is certainly the set-up of a pre-design tool for VAWT that could provide starting parameters for a high-fidelity evaluation, such as using CFD models that could capture all the relations between machine/flow field by means of proper calculation of the blade aerodynamics including turbulent models.