EAGER: Visualizing Land-to-Atmosphere Exchanges due to Wind Turbines Under Stratified Flows

0953053对于风力涡轮机阵列，通过引入大气热稳定或不稳定层结来加强陆气交换。稳定的大气湍流边界层(ATBL)减少了流动湍流。据称，风力涡轮机阵列在稳定的条件下(通常是在晚上)干燥土地，因此可能对农业产生影响，也可能影响风蚀。了解分层ATBL和风力涡轮机阵列的复杂相互作用是本研究的目标。为了获得正确的理解，风电场内发生的能量和热通量之间的关系以及它们与风力机产生的周期性尾迹之间的相互作用是至关重要的。在这项研究中，波特兰州立大学的风洞实验计划可视化分层湍流边界层在有和没有风力涡轮机的情况下的混合过程。实验目标是仔细和参数地控制分层，然后在生成的流动中执行流动可视化。单个风力涡轮机和ATBL之间的垂直运动/湍流交换将指导关于陆地到大气交换的结论，从而引发进一步的问题。这项研究可能对大规模部署此类技术所需的理解产生重大影响。这些初步的可视化将推动对这些流动的进一步研究，以进行更大的实验套件，考虑到风力涡轮机阵列而不是单个涡轮机。这些初步信息将有助于准备更详细的计划，以便将来提交给NSF-流体动力学计划和/或NSF-能源可持续发展计划，以详细研究这种相互作用。

0953053CalFor wind turbine arrays, a land-to-atmosphere exchange is enhanced by introducing atmospheric thermal stable or unstable stratification. The stable atmospheric turbulence boundary layer (ATBL) reduces flow turbulence. Wind turbine arrays have been claimed to dry the land during stable conditions (typically during evening), thus having a possible impact on agriculture, also possibly affecting wind erosion. Understanding complex interactions of a stratified ATBL and a wind turbine array is the goal of this study. To acquire the proper understanding, the relationship between the energy and heat fluxes occurring within the wind farm and their interactions with the periodic wake generated by the wind turbine is vital. In this study, wind tunnel experiments at Portland State University are planned to visualize the mixing processes of a stratified turbulent boundary layer with and without a wind turbine. The experimental objectives are to control stratification carefully and parametrically and then perform flow visualization in the generated flows. Vertical motions/exchanges of turbulence between a single wind turbine and ATBL will guide conclusions about the land-to-atmosphere exchanges, thus motivating further questions. This study can have significant impact on understanding needed for large-scale deployment of such technology. These preliminary visualizations will motivate further studies of these flows for a larger suite of experiments, taking into account wind turbine array rather than a single turbine. This preliminary information will help prepare more detailed plans for future submissions to NSF-Fluid Dynamics program and/or the NSF-Energy for Sustainability program to study such interactions in detail.