【作者】 吉庆丰； 曹阳； 王伟光； 陆小伟； 程吉林；

【Author】 Ji Qingfeng1, Cao Yang1,Wang Weiguang2, Lu Xiaowei3, Cheng Jilin1 (1.Yangzhou University,Yangzhou 225009; 2.Water Conservancy Bureau of Suqian City, Suqian 223800; 3. Jiangsu Survey and Design Institute of Water Resources Co. Ltd. Yangzhou 225009)

【机构】 扬州大学； 江苏省宿迁市水务局； 江苏省水利勘测设计研究院有限公司；

【摘要】 运用三维不可压缩流体的紊流模型,分别对拱型、屋脊型和斜顶型大棚内部气流场进行了精细的数值模拟,并在此基础上进一步计算了大棚的一次换气时间。从模拟结果可以看出,不同型式的大棚,其内部回流区的范围和流速分布形态明显不同,大棚的形式对其内部气流流态有显著的影响。在大棚尺寸和进出口条件相同的情况下,斜顶型大棚换气时间最短,拱型大棚次之,屋脊型大棚换气时间最长。从大棚内部气流流态好坏和一次换气时间长短角度看,斜顶型大棚结构形式最优。更多还原

【Abstract】 Airflows in arciform greenhouse, fastigium greenhouse and slanting crest greenhouse are studied by 3D uncompressible turbulent numerical simulation. The time of exchanging gas is calculated based on the gas velocity in greenhouse. The results of simulation show that there are 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 is nearly uniform in the mostly areas away from the inlet of greenhouse. The vortex scope and velocity distribution obviously vary with the shape of the greenhouse. The exchanging gas time of slanting crest greenhouse is shortest in three shape greenhouses in same calculating scope and boundary condition. From the point of view of flow pattern and exchanging gas time, slanting crest greenhouse is optimum.更多还原