Investigations of a vertical axis wind turbine with frontal cylindrical guide vane unit

Valentin Obretenov,Rossen Iliev,I Nastase,K Filipov,A.H Wierling,I Dukov,R Atanasova,A Terziev,T Totev,M Zlateva

doi:10.1051/e3sconf/202132704005

Abstract

The paper presents the results of an experimental study of a vertical wind turbine type Darrieus with frontal cylindrical guide vane unit. The main goal of the research is to analyze the influence of the geometry of a classical cylindrical guide vane unit on the active and passive zone of the wind turbine. The aerodynamic scheme is synthesized by a classic runner and frontal cylindrical guide vanes. Three different guiding devices of a model vertical wind turbine with frontally located guide vanes have been studied. Their influence on the characteristics of the turbine has been examined. The reasons of the differences in the characteristics of the three studied variants of the guiding devices are clarified by numerical study of the flow through the blade cascades of the guide vanes and the runner. The results of the study shows what is the reason for the positive effect of the cylindrical vane guide device on the wind turbine’s runner.

Highlights

The idea for this study comes from the analysis of the streamlines and velocity vectors of the airflow through vertical axis wind turbine with cylindrical guide vane device[1]
The results from the previous physical experiments conducted in HEHT Lab[2] in Technical University of Sofia, showed that the density of the guide vane cascade increases significantly the power coefficient of the wind turbine
The calculated velocity vectors of the flow through the active and passive zones for each of three variants are shown on Figs. 4 and 5 for the optimal operational modes of the wind turbine

Summary

Introduction

The idea for this study comes from the analysis of the streamlines and velocity vectors of the airflow through vertical axis wind turbine with cylindrical guide vane device[1]. It seems that the guide vanes acts more like as deflector rather than flow directing vane cascade. The results from the previous physical experiments conducted in HEHT Lab[2] in Technical University of Sofia, showed that the density of the guide vane cascade increases significantly the power coefficient of the wind turbine. The rear guide vanes are removed from the aerodynamic scheme, since they don’t significantly affect the power of the wind turbine[1]. This paper presents results of studies aimed at optimizing wind turbine efficiency

Objectives

Results

Conclusion