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论文类型：期刊论文

发表时间：2016-02-01

发表刊物：PROCEEDINGS OF THE INSTITUTION OF MECHANICAL ENGINEERS PART A-JOURNAL OF POWER AND ENERGY

收录刊物：SCIE、EI、Scopus

卷号：230

期号：1

页面范围：86-98

ISSN号：0957-6509

关键字：Near wake; velocity deficit; shear coefficient

摘要：This study investigates the effects of wind shear and wind shear coefficients on the near wake of a wind turbine. A wind turbine is subjected to the effects of wind shear, which leads to unsteady performance of the blade and characteristics of the blade near the wake. Wind shear coefficients of 0.1, 0.2, and 0.3 are used. The results are obtained using the three-dimensional incompressible Reynolds-Averaged Navier-Stokes equations, and the turbulence, are simulated via the shear-stress transport k- turbulence model. The flow of the air and, in particular, the axial velocity and tangential velocity are strongly affected by the rotation in the region of the blade near wake. There is an obvious velocity deficit at the near wake when the air flows over the blade, and this velocity deficit gradually decreases as the air flows downstream. The torque of the blade and the characteristics of the blade near wake periodically change with the effect of wind shear. The axial, tangential, and radial velocities and the turbulence intensity are strongly affected by wind shear at the region of the blade near wake, with the radial velocity particularly affected. The influence is more obvious as the shear coefficient increases. The effects of wind shear on the axial, tangential, and radial velocities and the turbulence intensity increase as the air flows downstream.