风向对温室内气流分布模式影响的CFD分析

CFD Analysis about Effect of Wind Directions on Airflow Profiles Inside Glasshouse

以自然通风的Venlo型两连栋玻璃温室为研究对象,基于CFD数值方法,以流体控制方程和标准湍流模型为理论依据,结合DO辐射模型对室外风向垂直屋脊和平行屋脊两种工况下室内气流分布模式进行了3-D数值模拟。结果发现风向垂直屋脊时侧窗外侧存在两个对称涡流,侧窗是主要进风口;室内气流速度随高度呈上升趋势;室内东侧流速较西侧低。风向平行屋脊时,侧窗气流流动复杂,天窗是主要进风口;气流速度随高度呈下降趋势;室内东侧流速较西侧高。两种风向下南北向流速分布相对均匀一致。室外风向对室内气流分布模式有明显影响。

The 3-D numerical simulation was performed based on the CFD numerical techniques for the natural ventilated bi-span Venlo glasshouse. The wind directions normal to the ridges and parallel to ridges were considered. The inside airflow patterns for two wind directions were obtained by solving the flow governed equations. And standard turbulent model and the DO radiation model were used for the simulation. The simulated results for the normal wind direction show the.west side-vent is a dominating inlet and two symmetric vertexes are founded near it; the airflow velocity is increasing along the glasshouse height direction; and it is faster inside eastern volume than western area. When the wind direction is parallel to the ridges, the airflow entered by the side-vent is characterized by a complex movement and roof-vents are important inlets; a decreasing airflow velocity is observed along glasshouse height; the airflow moves faster inside eastern than western volume. From the north side to south side, a uniform airflow velocity is found for two wind directions. So, a conclusion is made that outside wind directions have an obvious effect on inside airflow patterns.