Efficient contribution of partially tip cascaded horizontal-axis wind turbine

Deyaa Nabil Elshebiny,Farouk Mohammed Owis,Ali Abdelfattah Hashem

doi:10.1177/1687814019892113

Abstract

This article introduces novel blade tip geometric modification to improve the aerodynamic performance of horizontal-axis wind turbine by adding auxiliary cascading blades toward the tip region. This study focuses on the new turbine shape and how it enhances the turbine performance in comparison with the classical turbine. This study is performed numerically for National Renewable Energy Laboratory Phase II (non-optimized wind turbine) taking into consideration the effect of adding different cascade configurations on the turbine performance using ANSYS FLUENT program. The analysis of single-auxiliary and double-auxiliary cascade blades has shown an impact on increasing the turbine power of 28% and 76%, respectively, at 72 r/min and 12.85 m/s of wind speed. Knowing that the performance of cascaded wind turbine depends on the geometry, solidity and operating conditions of the original blade; therefore, these results are not authorized for other cases.

Highlights

It is evident from general design trends of horizontalaxis wind turbines (HAWTs) that relatively low solidity produces the best performance for high rotational speed designs.[1,2] analyzing the power contribution along with the wind turbine blade length indicates that most of the power is produced by the blade tip region.Cascades are used in turbo machines to guide the flow over the blade surface in order to improve the resultant performance
Date received: 29 April 2019; accepted: 24 October 2019 Handling Editor: James Baldwin
The results indicate that when adding only front or back cascade, the gain of turbine power output increases by about 28%; when adding both front and back cascading blades, the gain of power output exceeds 75% with respect to the original WT at the same operating conditions

Summary

Introduction

It is evident from general design trends of horizontalaxis wind turbines (HAWTs) that relatively low solidity produces the best performance for high rotational speed designs.[1,2] analyzing the power contribution along with the wind turbine blade length indicates that most of the power is produced by the blade tip region.Cascades are used in turbo machines to guide the flow over the blade surface in order to improve the resultant performance.

Results

Conclusion