GROUND SURFACE EFFECTS IN WIND FARMS: A MICRO WIND FARM MODEL STUDY

wind farm;wind tunnel;ground effects;Mechanical Engineering

Zhang, YifanMeneveau, Charles V. ;

Johns Hopkins University

关键词: wind farm;    wind tunnel;    ground effects;    Mechanical Engineering;   

Others  :  https://jscholarship.library.jhu.edu/bitstream/handle/1774.2/59219/ZHANG-THESIS-2018.pdf?sequence=1&isAllowed=y

瑞士|英语

来源: JOHNS HOPKINS DSpace Repository

【 摘 要 】

Roughness and obstacles on terrain can greatly influence the power output of a wind farm. In this essay, the effects of such surface roughness on a wind farm are explored using a micro wind farm model placed in a wind tunnel. Moreover, building upon recent studies that raised the possibility to increase power output by using windbreaks, the potential of windbreaks is also investigated by wind tunnel measurements. In this study porous disc models are used as a model for the wind turbines, allowing the measurement of the power output, thrust force and spatially averaged incoming velocity for every turbine. The model wind farm consists of 100wind turbine models. Experimental results show that additional surface roughness can significantly reduce the total power output of a wind farm. Results also show that the negative impact of windbreak wakes for an aligned wind farm will outweigh the local inviscid speed-up and thus not provide increased power output.