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<p>In this study, the performance of an H-Darrieus Hydrokinetic Turbine (H-DHT) with an upstream deflector in the delay region was analyzed using two-dimensional Computational Fluid Dynamics (2D-CFD). Initially, the rotor was simulated without obstructions. Then, various computational tests were performed on the same rotor, incorporating a deflector (a flat plate) at different inclination angles (0°, 30°, 45°, 60°, and 90°) in each simulation. The CFD analysis results indicated an efficiency increase of approximately 26% for the 90° configuration compared to the free rotor, at a blade tip speed coefficient of <InlineEquation ID="IEq1"> <EquationSource Format="TEX">\(\:\lambda\:=1.6\)</EquationSource> </InlineEquation> and a Reynolds Number of <InlineEquation ID="IEq2"> <EquationSource Format="TEX">\(\:Re=2\times\:{10}^{5}\)</EquationSource> </InlineEquation>. These findings demonstrated that the deflector reduces resistance from the current on the trailing blade, while its inclination directs the flow towards the advancing blade, thereby enhancing rotor propulsion. Moreover, the flow field analysis was also discussed and revealed a progressive increase in local velocity and negative pressure over the advancing blade with higher inclination angles, indicating that deflector geometry can be further optimized to control vortex formation and maximize hydrodynamic efficiency. However, the two-dimensional approach adopted imposes inherent limitations on representing three-dimensional flow interactions and transient effects, which may affect the accuracy of torque and wake predictions.</p>

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Influence of upstream deflector inclination on the performance of an H-Darrieus Hydrokinetic Turbine in low-speed streams

  • 期刊论文

  • 发表日期：

    2026年2月12日

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  • Christian Jair Martínez Urrutia,
  • Geraldo Lúcio Tiago Filho,
  • Isabela Florindo Pinheiro,
  • Antônio Carlos Barkett Botan,
  • Nelson Díaz Gautier,
  • Ramiro Gustavo Ramírez Camacho

摘要

In this study, the performance of an H-Darrieus Hydrokinetic Turbine (H-DHT) with an upstream deflector in the delay region was analyzed using two-dimensional Computational Fluid Dynamics (2D-CFD). Initially, the rotor was simulated without obstructions. Then, various computational tests were performed on the same rotor, incorporating a deflector (a flat plate) at different inclination angles (0°, 30°, 45°, 60°, and 90°) in each simulation. The CFD analysis results indicated an efficiency increase of approximately 26% for the 90° configuration compared to the free rotor, at a blade tip speed coefficient of \(\:\lambda\:=1.6\) and a Reynolds Number of \(\:Re=2\times\:{10}^{5}\) . These findings demonstrated that the deflector reduces resistance from the current on the trailing blade, while its inclination directs the flow towards the advancing blade, thereby enhancing rotor propulsion. Moreover, the flow field analysis was also discussed and revealed a progressive increase in local velocity and negative pressure over the advancing blade with higher inclination angles, indicating that deflector geometry can be further optimized to control vortex formation and maximize hydrodynamic efficiency. However, the two-dimensional approach adopted imposes inherent limitations on representing three-dimensional flow interactions and transient effects, which may affect the accuracy of torque and wake predictions.