基于CFD的夏季屋顶全开型玻璃温室自然通风流场分析  

Analysis of Flow Field for Full Open-roof Glass Greenhouse with Nature Ventilation in Summer Based on CFD

作　　者：王新忠[1,2] 张伟建[1,2] 张良[1,2] 管泽峰[1,2] 

机构地区：[1]江苏大学现代农业装备与技术教育部重点实验室,镇江212013 [2]江苏大学农业装备工程学院,镇江212013

出　　处：《农业机械学报》2016年第10期332-337,共6页Transactions of the Chinese Society for Agricultural Machinery

基　　金："十二五"国家科技支撑计划项目(2014BAD08B03);江苏省重点研发计划项目(BE2016323);江苏高校优势学科建设工程项目;昆山市科技计划项目(KN1504)

摘　　要：为研究自然通风对屋顶全开型玻璃连栋温室夏季降温的影响,采用k-ε湍流模型和DO辐射模型建立了屋顶全开型温室在夏季高太阳辐射和弱风天气下的CFD模型,将模型的模拟值与实测值进行对比,两者平均相对误差为2.5%。利用建立的CFD模型,进行了夏季高温季节通风降温调控措施的试验分析。结果表明:屋顶全开窗玻璃温室中,天窗的开窗角度应与侧窗配合,这样能增强通风的降温效果;在侧窗为45°时,天窗调整至60°的温室整体降温效果优于天窗45°或75°开启角度。屋顶全开窗玻璃温室在使用侧窗和调控至合理开启角度的天窗进行联合通风的工况下,温室整体温度从38.4℃降至36.9℃,调控措施降温效果明显。In order to research the cooling effect in nature ventilation of full open-roof glass greenhouse,the CFD model was established by the k-ε turbulence and DO radiation model with high solar radiation and weak wind weather. The simulated values of the model and measured values were contrasted,and the average relative error was 2. 5%. The experiment of cooling control measurements in greenhouse was carried out by using verification model. The results of experiments showed that under current natural ventilation conditions,the greenhouse gables ventilated by fan-window and air holes of dry wet curtain.Outdoor air entered into greenhouse in horizontal direction with no upward movement velocity components. The ventilated effect of side window combined with the skylight window was poor under this condition. There was large-area air,which flowed slowly in the greenhouse. After the modification of side window structure,the airflow direction was led to generate upward velocity components when it entered into greenhouse from south gable. The ventilated effect of side window combined with skylight window was improved. The opening angle of skylight should be matched with side window,which can enhance the ventilation cooling effect. When the angle of side window was 45°,and the skylight was adjusted to 60°,the overall cooling effect of the greenhouse was better than those under other conditions which the angle of opening skylight was 45° or 75°. The overall temperature of the greenhouse was decreased from 38. 4℃ to36. 9℃ and the cooling effect was improved obviously after using side window combined with roof window,when the opening angle of skylight was reasonably coordinated with side window.

关 键 词：屋顶全开窗型温室 流场 CFD 降温 

分 类 号：S625.51[农业科学—园艺学]