作物高度对温室自然通风影响的CFD分析

近年来,随着计算机性能和技术的发展,计算流体力学在设施农业中得到了广泛的应用。为此,基于CFD数值方法 ,在Venlo型温室自然通风条件下,对不同作物高度的室内气流和温度分布进行了数值模拟。结果表明:不同作物高度对温室自然通风气流速度变化影响显著;室外风速1.5m/s时,温室高度1.2m处室内气流速度低于0.2m/s;作物高度对温室内沿跨度方向温度阶梯变化影响较大,作物高度越高,温度阶梯变化越明显。最后,根据仿真得到不同作物高度自然通风温室1.2m高水平面的平均温度,得出作物高度对自然通风温度的影响规律。

CFD Analysis about Effect of Plant Height on Natural Ventilation in Greenhouse

In recent years, with the improvement of computer performance and technology,computational fluid dynamics method has been widely used in facility agriculture.The paper study the distribution of air flow and temperature under dif-ferent height of crop in a naturally ventilated Venlo greenhouse with computational fluid dynamics method.The results for the natural ventilation show the significant effects of different crop height on air flow velocity in greenhouse.The air veloc-ity at the height of 1.2m in the greenhouse is less than 0.2m/s while the outdoor wind speed at 1.5m/s.Crop height had a greater influence on the temperature variation along the span direction in the greenhouse.The higher crop height grows, the more obvious temperature change.The average temperature at the level of 1.2 m was obtained by the simulation, the influence rule was obtained in crop height for the temperature on the natural ventilation.