Computational evaluation of an optimum leading-edge slat deflection angle for dynamic stall control in a novel urban-scale vertical axis wind turbine for low wind speed operation

Tariq Ullah, Adeel Javed, Ali Abdullah, Majid Ali, Emad Uddin

Research output: Contribution to journalArticlepeer-review

20 Citations (SciVal)

Abstract

This paper explores passive flow control via leading-edge (LE) slats to reduce the dynamic stall (DS) phenomenon and related blade-wake interaction in an H-Darrieus type vertical axis wind turbine (VAWT) operating under low wind speed conditions. A comprehensive 2D unsteady computational fluid dynamics (CFD) assessment has been carried out for the non-slatted baseline rotor and the advance slatted rotor (ASR) configurations. The unsteady Reynolds-averaged Navier-Stokes (URANS) approach with k-ω shear stress transport (SST) turbulence model and sliding mesh technique have been applied in Ansys Fluent. Optimum slat deflection angle δ has been evaluated using the single-blade oscillatory case with and without the LE slats. Results indicate a reduction in optimum δ from 16° at rated wind speed of 10 ms−1 to 12° for low wind speed operation at 5 ms−1. A significant increase in the maximum coefficient of lift CL,max by approximately 32% and a delay in stall angle of attack αmax by 3° is obtained with ASR configuration compared to the baseline. Further assessment of the ASR configuration on the three-blade rotatory case demonstrates an increase in the power coefficient CP by approximately 15% at the rated tip-speed ratio λ compared to the baseline.

Original languageEnglish
Article number100748
JournalSustainable Energy Technologies and Assessments
Volume40
Early online date6 Jun 2020
DOIs
Publication statusPublished - 31 Aug 2020
Externally publishedYes

Keywords

  • Computational fluid dynamics
  • Dynamic stall
  • Leading-edge slat
  • Passive flow control
  • Vertical axis wind turbine

ASJC Scopus subject areas

  • Renewable Energy, Sustainability and the Environment
  • Energy Engineering and Power Technology

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