水上光伏基座水体交换对影响因素的响应

Response of Water Mass Exchange in Floating Photovoltaic Modules to Influencing Factors

摘要:

采用平面激光诱导荧光（PLIF）法对不同温差、水流流速、侧板开孔面积条件下水上光伏基座的水体交换进行观测。实验结果表明：光伏基座滞留水体的质量与时间呈负指数关系，原水体在基座内的滞留时间由温差、周边水流流速及基座侧板开孔率共同决定。在较小的温差下，水流流速对基座内的水体交换影响显著。而当温差较大时，增大基座侧板开孔率对促进基座内水体的交换更为有效。合理的底座开孔率不仅有助于基座内温水的直接稀释，从开孔进入基座的水流也可进一步加强基座底部湍流层涡团的卷吸作用，显著促进基座内的水体交换。

Abstract:

The planar laser induced fluorescence （PLIF） method was employed to investigate the mass exchange characteristics of water in floating photovoltaic modules. The impact of temperature difference， ambient flow velocity， and perforation rate were observed. The experimental results indicate that the dimensionless concentration of the original warm water in the module decreases exponentially over time， with the retention duration determined by the combined effects of temperature difference， flow velocity， and the perforation rate. Under small temperature differences， flow velocity has a significant impact on the mass exchange， while an increased perforation rate is more effective under large temperature differences. In addition to providing direct diluting effects， the water flow from the punching area was observed to enhance the large-scale circulations in the turbulent layer at the bottom of the base module， resulting in a significant improvement in overall mass exchange efficiency.