基于CFD的密闭式半阶梯笼养蛋种鸡舍过渡性通风研究

针对密闭式半阶梯笼养蛋种鸡舍春秋季节的过渡性通风方式,采用计算流体力学(computational fluid dynamics,CFD)技术,根据鸡舍实测值所确定的风机、侧窗等边界条件,对该蛋种鸡舍内的环境温度和气流速度的分布进行三维数值模拟。模拟时设置白天室外环境温度为25℃,晚上室外环境温度为13℃,2种温度下分别设置多个侧窗导流板角度。模拟结果表明:侧窗导流板与壁面的倾角明显影响了鸡舍内速度场和温度场的均匀性,白天导流板开启角度α=67.5°,晚上导流板开启角度α=45°时更加合理。通过鸡舍现场采集关键位置的风速和温度数据与仿真结果比较发现,风速测试值与模拟值相对误差白天平均为14.7%,晚上平均为11.5%;温度测试值与模拟值相对误差白天平均为3.1%,晚上平均为3.6%;表明数值模拟与现场实测有较好的吻合度,为密闭式半阶梯笼养蛋种鸡舍过渡性通风方式下的环境控制提供理论依据和指导。

CFD-based studies on transitional ventilation of closed henhouse with semi ladder coop

The three-dimensional temperature and gas flow fields of transitional ventilation of closed henhouse with semi ladder coop were simulated with CFD software.In the simulation,the outdoor air temperature was 25 ℃ during the day and 13 ℃ during the night.The guide plates of side windows were provided with four different angles.Results showed that the angle of guide plate affected the uniformity of gas flow field and temperature field.The optimal angle of guide plates was found.The results of comparing the measured data with simulation showed that the relative error of gas velocity was 14.7％ during the day and 11.5％ during the night.The relative error of the temperature was 3.1％ during the day and 3.6％ during the night.The numerical simulation is in good agreement with the field measurement.It will provide a theoretical basis and guidance for the environmental control of the closed henhouse with semi ladder coop.