【摘要】 运用三维不可压缩流体的RNGk-ε紊流模型,分别对拱型、屋脊型和斜顶型大棚内部气流场进行精细的数值模拟。结果表明:3种大棚在进气口附近都存在着多个回流区,流动呈现高度的三维特性,流态较为复杂,而在远离进口的大部分区域,流动趋于均匀。大棚进口两侧的回流区范围较大,其具体范围因大棚形式的不同而有明显的变化,大棚形式对其内部气流流态有显著的影响。更多还原

【Abstract】 <Abstrcat> Airflows in arciform greenhouse, fastigium greenhouse and slanting crest greenhouse were studied by 3D uncompressible turbulent numerical simulation. The results of simulation show that there were many vortexes in the round of the inlet of three kinds of greenhouse, the flow patterns have typical characteristic of 3D turbulent flow. The airflow velocity was nearly uniform in the mostly areas away from the inlet of greenhouse. The scopes of vortex were bigger in the two sides of the inlet of greenhouse and obviously varied with the types of the greenhouse. We can see that the types of different greenhouse have a very notable effect on the airflow in the greenhouse.更多还原