Analysis of small vertical wind turbine having H-Darrieus blades with stall delay model

Abstract

Several models, about the power performance prediction for the Darrieus wind turbines, have been developed during the last decades. Among these models, an enhanced multiple stream tubes model, LDWT (Lee-Darrieus Wind Turbine model) for Darrieus wind turbine blade with experimental aerofoil characteristics showed simple, fast, and precise results, without time consuming, of solving Reynolds Averaged Navier-Stokes equation for the complex air flow passing through rotational blade. Recent interest has been paid on the straight Darrieus rotor blade (H-Darrieus rotor) because of its several advantages over the curved blades. However, few reports cover its power performance prediction model. In this paper, the LDWT was extended into the H-Darrieus rotor with 2-dimensional experimental data and stall delay model. From results for the high solidity H-Darrieus rotor, LDWT underestimate the test data without stall delay model, but it shows dramatically well matching with test data when stall delaying is calculated additionally in the model. Therefore, it is shown that the model with stall delaying can be used for the design and analysis of H-type vertical wind turbine blade without solving of Navier-Stokes equation.