Turbulence effects on the wake flow and power production of a horizontal-axis wind turbine

Chia Ren Chu, Pei Hung Chiang

Research output: Contribution to journalArticlepeer-review

67 Scopus citations


This study experimentally investigated the effects of ambient turbulence on the wake flows and power production of a horizontal-axis wind turbine. The approaching flows included low-turbulence smooth flow and grid-generated turbulent flow. The profiles of time-averaged velocity, turbulence intensity and Reynolds stress from the intermediate to the far-wake regions were measured and compared for smooth and turbulent flows. Based on the measured data, prediction models for the centerline velocity deficit, turbulence intensity, wake radius and velocity profile were proposed. In addition, the experimental results showed that the power productions in the grid-generated turbulent flows were slightly higher than that in the smooth flow. But the power loss due to the velocity deficit in the wake flow was larger than 50% when the downwind distance was less than 12. D ( D is the rotor diameter). An empirical relation between the power production and the downwind distance x and lateral distance y was proposed.

Original languageEnglish
Pages (from-to)82-89
Number of pages8
JournalJournal of Wind Engineering and Industrial Aerodynamics
StatePublished - Jan 2014


  • Grid-generated turbulence
  • Wake flow
  • Wake interference
  • Wind tunnel experiment
  • Wind turbine


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