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Guo T.-T.,Beijing Guodian Longyuan Environmental Engineering Co. | Wu D.-W.,Datang Shandong Renewable Power Co. | Wang C.-Y.,Datang Shandong Renewable Power Co. | Li S.-H.,Northeast Dianli University
Dongli Gongcheng Xuebao/Journal of Chinese Society of Power Engineering | Year: 2010

Four different sizes of pre-bend designs were performed for a 1.2 MW wind turbo-generator blade. While numerical simulation was made for its flow field using SST κ-ω turbulence models, during which the influence of pre-bending size on wind turbo-generator power output was obtained, and thus an appropriate pre-bending size was determined. Results show that the wind turbo-generator power output reduces nonlinearly with growing pre-bending size, and the pre-bending profile can effectively regulate the wind turbo-generator power output when wind speed changes. For a pre-bending size of 0.6 m, the design power of 1.2 MW can be reached with only a relative error of 0.0006%. However, the interaction induced by blade rotation is inevitable. Source


Li S.-H.,Northeast Dianli University | Kuang Q.-F.,Northeast Dianli University | Wu D.-W.,Datang Shandong Renewable Power Co. | Guo T.-T.,Beijing Guodian Longyuan Environmental Engineering Co. | Wang M.-L.,Yunnan Longyuan Wind Power Co.
Dongli Gongcheng Xuebao/Journal of Chinese Society of Power Engineering | Year: 2011

Based on the 3D model built up for a 1.2 MW wind turbine, numerical simulation was carried out using SST k-ε turbulence model, Simple algorithm and discrete equations established by finite volume method, so as to study how following factors influencing the wind turbine output power, such as the pressure, velocity and turbulent kinetic energy on different flow-field sections of the wind turbine. Results show that the mutual interference between rotary blade and tower frame may change the aerodynamic performance and reduce the available torque of wind turbine, which may therefore result in decreased output power of the wind turbine; the existence of tower frame plays an important role in influencing the flow field of wind turbine, but the region affected by central swirl and adhesive vortex is relatively small; the velocity field may be effected by both the wheel and the turbine up to a few hundred meters after the wind turbine, but the region affected by the turbine is smaller than by the wheel. Source


Li S.,Northeast Dianli University | Yue W.,Northeast Dianli University | Kuang Q.,Northeast Dianli University | Wu D.,Datang Shandong Renewable Power Co. | Wang C.,Datang Shandong Renewable Power Co.
Zhongguo Dianji Gongcheng Xuebao/Proceedings of the Chinese Society of Electrical Engineering | Year: 2011

Tightening of the constraints on the siting of wind farms is likely to increase the scale of the problem and improve the output power. The aerodynamic interaction between two rotors in both co-axial, arrangement in parallel and stagger arrangement and offset configurations was simulated using the Fluent 6.3. The numerical simulation was verified for its rationality by comparison of computational fluid dynamics(CFD) model and wake model. Comparison of different location of both turbines simulation results were used for the analysis of wake interaction and velocity deficit in downstream wind direction. The results show that downstream turbine makes the upstream diverging wake to be convergence when co-axial wind conditions, and the output of downstream turbine is affected by upstream wake. Arrangement in parallel and stagger arrangement have little power loss although their flow field were extruding by the wake effect of the reference turbine. © 2011 Chin. Soc. for Elec. Eng. Source

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