摘要
以Navier-Stokes方程为模型基础,运用CFX软件对华东地区三连栋塑料温室在配置内遮阳网后室内自然通风气流场进行三维稳态模拟,外界风向取平行于温室的屋脊方向。模拟结果显示,在设置内遮阳网后,两侧栋内气流流速明显降低,尤其是顶窗开向对面侧侧栋内,气流平均速度只有外界风速的1/6左右,不及无遮阳网时的一半;在遮阳网覆盖下温室中间栋气流流态变化不大,流场略偏向顶窗开向侧方向。顶窗开向对面侧气流流动的均匀性有所改善,但平均流速下降,环流不太明显,静止区域小,尤其是下部区域。在顶窗开向侧侧栋内,气流虽仍集中在温室中上部区域,但均匀性有所提高;侧窗和山墙门进风对温室内气流场流态的影响作用较大,而顶窗使得遮阳网上部的气流流动得到明显加强。
Based on the equation of Navier-Stokes and with computational fluid dynamic software CFX, a 3-D steady simulation of natural ventilation was performed in the multi-span plastic greenhouse that was equipped with inner solar-shading screen. Outside wind direction was assumed to be parallel to the greenhouse ridge. Result showed that the airflow velocity decreased remarkably in two side-spans, and it was about one sixth of the outside and less than half of airflow velocity inside the greenhouse without inner screen. Flow state inside the middle span did not seem to change much except for a bit of shift in the direction of right side-span. The airflow uniformity was somewhat improved in left side-span, while the average velocity decreased and circumfluence was not so obvious. The static area occupied greenhouse. In the left side-span, the airflow less space, especially in the lower part of gathered among the middle and upper area of greenhouse, while the uniformity was improved a little. The frontispiece door and side-opens played an important role in affecting the airflow pattern inside the greenhouse, the airflow movement above solar screen strengthened by the effect of top-windows.
出处
《农业机械学报》
EI
CAS
CSCD
北大核心
2007年第2期120-124,133,共6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)
关键词
温室
内遮阳网
自然通风
气流场
模拟
Greenhouse, Inner solar-shading screen, Natural ventilation, Airflow,Simulation
