Abstract

AbstractThe complex aerodynamic interactions between the rotor and the duct has to be accounted for the design of ducted wind turbines (DWTs). A numerical study to investigate the characteristics of flow around the DWT using a simplified duct–actuator disc (AD) model is carried out. Inviscid and viscous flow calculations are performed to understand the effects of the duct shape and variable AD loadings on the aerodynamic performance coefficients. The analysis shows that the overall aerodynamic performance of the DWT can be increased by increasing the duct cross‐sectional camber. Finally, flow fields using viscous calculations are examined to interpret the effects of inner duct wall flow separation on the overall DWT performance.

Highlights

  • Ducted wind turbines (DWTs) improve the energy extraction in comparison with horizontal-axis wind turbines (HAWTs).[1]

  • The present paper aims to characterize the aerodynamic performance of ducted wind turbine (DWT) based on two-dimensional computational fluid dynamics (CFD) analysis

  • The investigation presented in this paper focused towards aerodynamic performance improvement of ducted wind turbines using a simplified duct-actuator disc (AD) model

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Summary

INTRODUCTION

Ducted wind turbines (DWTs) improve the energy extraction in comparison with horizontal-axis wind turbines (HAWTs).[1]. Numerical studies based on inviscid potential flow theory have been proposed.[10,11] Bontempo and Manna[11] studied the effects of the duct cross section on the performance of DWT using a semianalytical actuator disc (AD) approach. They found that the gain in the performance of the DWT depends upon the aerodynamic duct thrust, which is improved further by increasing the duct profile camber. Some insights on the performance coefficients with respect to AD loading will be discussed in Section 6, together with flow analysis obtained using RANS simulations

DUCT-AD FLOW MODEL
COMPUTATIONAL SETTINGS AND PARAMETERS
FIGURE 5 Computational grid along the leading and trailing edge of the duct
Panel method
RANS method
GRID INDEPENDENCE STUDY AND SOLUTION VALIDATION
DUCT SHAPE PARAMETRIZATION
RESULTS AND DISCUSSION
Duct force coefficient
Power coefficient
Flow field analysis
CONCLUSION
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