自然通风下栽培番茄的单栋温室内气流场稳态模拟  

Steady State Numerical Simulation of Airflow Pattern in Natural Ventilated Tunnel Greenhouse

作　　者：沈明卫[1] 郝飞麟 

机构地区：[1]浙江大学农业生物环境工程研究所 [2]中国空分设备公司环境与公用工程部

出　　处：《农业机械学报》2006年第5期101-105,共5页Transactions of the Chinese Society for Agricultural Machinery

基　　金：浙江省自然科学基金资助项目(项目编号:M303436);浙江大学第八期大学生科研训练计划项目

摘　　要：从N av ier-S tokes方程出发,运用CFX软件对外界风向与屋脊平行和相夹45°两种情形下温室内气流场进行了稳态模拟研究。结果显示,对于前者,气流从山墙门和侧窗的上部进入,从侧窗的下部流出,气流在温室内沿中心纵截面分布的对称性较好,在温室的后半部气流逐渐扩散,紊流加强;对于后者,气流从山墙门和迎风侧窗处进入,两股气流相遇后受棚面形状及作物的影响而形成各种涡流,最后从背风侧窗处流出。气流在接触到栽培作物时流速迅速减小,作物冠层边界受到周围空间气流的影响,但在作物冠层内受周围空间气流影响不大。Based on the Navier-Stokes law and with the help of CFX software, a three-dimensional steady state numerical simulation of airflow pattern is undertaken in tunnel greenhouse with tomato growing inside. The analysis is concerned with the situation of outdoor wind direction parallel and 45 degree to the greenhouse ridge respectively. Results show that the direction of outside airflow plays a dominant role in affecting the airflow distribution inside the tunnel greenhouse. Under the condition of wind direction parallel to the greenhouse ridge, airflow penetrates into the greenhouse through frontispiece-open and the upper part of side windows, comes out from the lower part of the side windows. The airflow distribution displays somewhat symmetrical along the vertical center section of the tunnel greenhouse, and with the airflow dissipates gradually in the remains of greenhouse, the turbulence is enhanced. For the condition of wind direction with 45 degree to tunnel ridge, air flows in mostly from the windward side window and frontispiece-open, departs from leeward side windows. Lots of vortices are formed at the impingement zone of the two incoming airflow from frontispiece-open and windward side windows and upon the effect of greenhouse shape and plant inside. In both two wind directions, the airflow rate decreases rapidly when it encounters plant inside, and airflow distributes comparatively even inside the crop canopy, not much subject to the airflow environment around.

关 键 词：单栋温室 气流场 模拟 

分 类 号：S625.5[农业科学—园艺学]