【摘要】 风电场的数量和规模对大气边界层的气象特性具有不可忽略的影响,作为重要的气象参数,温度层结是影响大气流动及污染物扩散的重要因素之一。文章通过建立风力机及周围流场模型,采用非稳态大涡模拟方法结合大气湍流理论,引入UDF函数对Fluent软件进行了二次开发,加载大气边界层风速廓线,对风力机在不同温度层结条件下对底层边界层区域特性进行对比。研究发现,在不同层结下温度的变化不同:风力机运行在稳定层结时,风力机近尾流区域的温度较周围区域有所升高,在50 m高度处温差达到最大,数值为0.465K;而不稳定层结的情况却是相反,在风力机近尾流区域的温度较周围的区域有所降低,但整体温度变化没有稳定层结时明显,最大温差为0.281 K。更多还原

【Abstract】 The quantity and scale of wind farms have a non-negligible influence on the meteorological characteristics of the atmospheric boundary layer. Temperature stratification is an important meteorological parameter and one of the important factors affecting atmospheric flow and pollutant dispersion. By establishing the wind turbine and the surrounding flow field model, the unsteady large eddy simulation method is combined with the atmospheric turbulence theory, and the UDF function is introduced to redevelop the Fluent software, and the atmospheric boundary layer wind speed profile is loaded, so that the wind turbine is in different temperature layers. The characteristics of the underlying boundary layer region are compared under the condition of the junction. The study found that the temperature changes vary under different layers. When the wind turbine is running at a stable stratification, the temperature of the wind turbine near the wake region is higher than that of the surrounding area, and the temperature difference reaches a maximum at a height of 50 m, and the value is 0.465 K. The case of unstable stratification is the opposite. The temperature in the near wake region of the wind turbine is lower than that in the surrounding area, but the overall temperature change is not obvious when the stratification is stable. The maximum temperature difference is 0.281 K.更多还原