A Measurement of the Three-Dimensional Near-Wake Velocity Field of a Model Horizontal-Axis Wind Turbine

Hu, Danmei; Ren, Jianxing; Du, Zhaohui

doi:10.1007/978-3-540-76694-0_199

Cited by 1 publication

(1 citation statement)

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“…Obtained results have permitted to improve the performance of an existing numerical tool based on the prescribed wake/thin-lifting surface method by reducing calculations time to 60%. Hu et al (2007) have underlined the complexity of the wind turbine near wake for a horizontal axis wind turbine model tested in a circular cross-section wind tunnel.…”

Section: Introductionmentioning

confidence: 99%

Experimental Investigation of Tip Vortex Meandering in the Near Wake of a Horizontal-Axis Wind Turbine

Dahmouni¹,

Oueslati²,

Nasrallah³

2017

JAFM

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The aerodynamic optimization of horizontal axis wind turbine has became one of the most important challenge in the renewable energy field. Over the past few years, many researchers have drawn more attention to the physical processes of the wind energy conversion and precisely the identification of the main causes of energy losses. This paper presents an experimental investigation of near wake dynamics for a model horizontal axis wind turbine in a wind tunnel. The coherent structures downstream of the rotor were studied for different tip speed ratios using the Particle Image Velocimetry (PIV) technique. The influence of the tip vortex meandering was discussed and analyzed using the Proper Orthogonal Decomposition (POD) method. The high-energy modes show that radial meandering is the most energetic source of perturbation in each tip vortex sub-region. The energy fraction of these modes increase gradually during the development of the helical tip vortex filament, which confirm the growth of vortex wandering amplitude in the near wake.

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Section: Introductionmentioning

confidence: 99%