光伏板间距对近表面流场和沙尘沉积量的影响

The influence of the distance between two photovoltaic panels on the near-surface flow field and dust deposition

积尘是影响荒漠光伏电站发电量的重要因素之一,光伏板表面沙尘沉积量的确定对于光伏电站设计、真实发电量的预测以及制定除尘决策都有着十分重要的意义。光伏板周围的流场结构会直接影响沙尘的沉积量,因此,本文以两块大小相同、倾角均为35°的光伏板组成的小阵列为研究对象,利用流体动力学的方法探究不同板高-板间距之比对光伏板表面及其周围流场结构和板面沙尘沉积的影响规律。结果表明:不同安装间距下,前光伏板近表面风速大小基本相同,而后光伏板近表面风速发生不同程度的改变,且两光伏板间距越小,前板对后板近表面风速的影响越大。另外,两板间距为0.45m时前后两光伏板表面沙尘总沉积量最小,对光伏板输出功率影响最小。本文研究结果可为荒漠化地区光伏阵列的设计和除尘决策提供一定的理论依据。

Dust deposition is one of the important factors affecting the generation capacity of desert photovoltaic power station.The determination of sand and dust deposition on the surface of photovoltaic panel is of great significance to the prediction of the real power generation of photovoltaic power station and the decision making of dust removal.The flow field structure around the photovoltaic panel will directly affect the deposition of sands and dusts.Therefore,in this paper,a small photovoltaic panels array with same size and with an inclination angle of 35°is taken as the research object,and the flow field structure and the dust deposition on the photovoltaic panel under different ratios between plate height and plate distance are explored by using the method of fluid dynamics.Results show that under different installation intervals,the wind speed near the surface of the front photovoltaic panel is basically the same,while the wind speed near the surface of the rear photovoltaic panel changes to different degrees.Moreover,the smaller the space between the two photovoltaic panels is,the greater the influence of the front panel on the wind speed near the surface of the rear panel is.In addition,when the ratio between the plate distance is 0.45 m,the total amount of sand deposition on the two photovoltaic panels is the smallest,which has the least influence on the output power of photovoltaic panels.The results of this paper can provide a theoretical basis for the design and the dust removal decision of photovoltaic array in desertification areas.