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机构地区:[1]浙江大学流体动力及机电系统国家重点实验室,浙江杭州310027
出 处:《机电工程》2013年第3期277-280,291,共5页Journal of Mechanical & Electrical Engineering
摘 要:针对高密实度H型风力机在不同叶片数下的气动特性及风场布置等问题,将采用k-ωSST湍流模型进行数值模拟的方法应用到对高密实度H型风力机的研究中。开展了对风力机做功特性的分析,建立了流场与风力机功率之间的关系,提出了单个风力机设计选择叶片数时应综合考虑风力机效率和轴承安全这两个因素;在尾流场分析的基础上对不同叶片数的风力机在风场前后串列布置进行了评价。研究结果表明:叶片在上游(θ=90°附近)的气动性能决定整个风力机的性能;由正常工况点下的流场图显示,叶片数的增加导致流场复杂,以及叶片的内外压差逐渐减小,从而使得功率下降;尾流场流向速度恢复至来流速度的距离随叶片数的增加而减小了28.1%,这对风力机的前后串列布置提供了依据。Aiming at the problems of aerodynamic characteristics and the wind farm arrangement issues of the high solidity H-type wind turbine under different numbers of blades, the k-ω SST turbulent model was investigated. After analysis of aerodynamic characteristics around the turbine, the relationship between the flow and the performance of the turbine was established. A method was presented to consider the efficiency and bearing security when designed. The turbines arrangement was evaluated on the analysis of the wake flow field. The results indicate that the performance of the turbine is mainly dependent on the performance of the blade in the upstream ( 0 = 90~ nearby). Figures show that, with the increasing of the blade numbers, the flow becomes complicated and decreases the pressure difference of inside and outside of blade, so that it makes the power decrease. The distance of the wake field flow velocity recovery to the inlet velocity decreases 28.1% with the blade number enhanced ,which provides the references for the arrangement of wind turbines.
分 类 号:TM315[电气工程—电机] TH122[机械工程—机械设计及理论]
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