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通过三维计算流体动力学模拟确定了我国华中地区使用的扇形截面现代化塑料大棚的通风参数,并进一步预测了大棚作物的蒸腾率,考虑了作物物理形态的分形特征,提出了一种简单快速并且普适的计算温室通风率和作物蒸腾率的方法.模拟结果和试验数据的比较分析显示模型能够有效描述通风特征,给出通风参数并预测作物蒸腾率,模拟结果在正午前后最为准确.由于计算简单快捷,可用于在个人计算机上实现大棚通风根据外界环境变量的自动化调控.结果还显示相对于国外所使用温室,我国扇形截面现代化塑料大棚能够保持较好的通风和室内风向的一致性.研究结果证明了该方法的有效性、合理性和可实现性,对温室微气象智能调控的发展具有一定的参考价值.
Through the three-dimensional computational fluid dynamics simulation, the ventilation parameters of modern plastic greenhouse with fan-shaped cross section used in central China were determined, and the transpiration rate of greenhouse crops was further predicted. Considering the fractal characteristics of crop physical form, a simple and rapid method was proposed Appropriate method of calculating greenhouse ventilation rate and crop transpiration rate.The comparative analysis of simulation results and experimental data shows that the model can effectively describe the ventilation characteristics, give the ventilation parameters and forecast the crop transpiration rate, the simulation result is the most accurate before and after noon.Because the calculation is simple Fast and can be used to realize the ventilation of the greenhouse on the personal computer according to the automatic control of the environmental variables.The results also show that compared with the greenhouse used abroad, the modern plastic shed of fan-shaped section in our country can maintain good consistency of ventilation and indoor wind direction.Results This method is proved to be effective, reasonable and implementable, which is of certain reference value to the development of greenhouse microcosmic intelligent regulation.