摇摆式垂直轴风力机气动特性数值模拟

NUMERICAL SIMULATION OF AERODYNAMIC CHARACTERISTICS OF SWING VERTICAL AXIS WIND TURBINE

针对垂直轴风力机无需对风,湍流风风向不断变化的情况,提出转轮轴向力随风向摇摆的垂直轴风力机,利用摇摆产生的切向风和来流风共同作用下的风能,提高气动性能。采用RNG k-ε湍流模型对三叶片摇摆式风力机进行模拟,研究风向变化的周期、幅角以及摇摆迟滞时间对固定式和摇摆式垂直轴风力机力矩系数的影响规律。结果表明:与固定式垂直轴风力机相比,该摇摆式垂直轴风力机能有效改善部分方位角的力矩系数,增大风力机的输出功率。

In view of the situation that the vertical axis wind turbine(VAWT)does not need to face the wind and the direction of turbulent wind changes constantly,a VAWT is proposed in which the axial force of the rotor swings with the wind direction.The wind energy from the incoming wind as well as the tangential wind generated by swing is captured,the aerodynamic performance of VAWT is increased due to the tangential wind.RNG k-εturbulence model is adopted to simulate three-blade swing wind turbine.The effects of changing period,amplitude angle and swing lag time on torque coefficient of the fixed and swing VAWTs were studied.The results show that,compared with the fixed VAWT,the swing VAWT can effectively improve the moment coefficient at partial azimuth angles and increase the output power of the wind turbine.