摘要
基于CFD数值模拟技术,采用标准湍流模型和DO辐射模型对室外风速为0.9m.s-1时Venlo型玻璃温室内气流分布模式进行了3-D稳态求解,并对模拟结果进行了试验验证,结果表明:模拟值与实测值吻合良好,平均相对误差为13.4%,CFD数值模型有效。采用该模型对室外风速为1.5m.s-1和2m.s-1时室内气流场进行了预测,并得出了3种风速下温室的通风率与室外风速之间呈线性关系,R2=0.984 6。风速是影响温室通风率的关键因素。风速低时,室内气流分布模式受室外环境影响较轻微,作物区气流分布比较均匀一致;随着风速的增高,室内气流流速增大并伴有涡流出现,温室高度方向梯度明显。
The 3-D numerical simulation was done based on the CFD technique for the natural ventilated Venlo glasshouse under the specific boundary conditions.The standard turbulent model and DO radiation model were used for numerical computations.The measurement was conducted to validate the CFD model.The results showed the simulated values were good agreed with measured values for the average airflow velocities in the empty glasshouse,and the average relative error was 13.4%.Then,the CFD models were used to predict the airflow profiles with external wind speeds of 1.5m.s-1 and 2m.s-1.A linear relationship between ventilation rates and the outside wind speeds was founded,and the decided coefficient R2 = 0.984 6.the wind speeds was a key factor for ventilation rates.At crops level the airflow profiles were uniform and it was affected slightly for lower external wind speed.The higher airflow speeds and vertex were observed when the external wind speeds increase and there is an obvious grade along vertical height.
出处
《农机化研究》
北大核心
2010年第12期15-18,共4页
Journal of Agricultural Mechanization Research
基金
教育部高等学校博士学科点专项科研基金项目(200802990009)
江苏大学现代农业装备与技术重点实验室开放基金项目(NZ200802)
