湿帘内侧导流板对鸡舍气流及温度影响的CFD模拟

CFD Simulation for Influence of Air Flow and Temperature in Hen House with Setting Flaps behind Cooling Pad

湿帘内侧的保温盖板在夏季可起到导流板作用,缓解湿帘开启后温度骤降对蛋鸡生产的影响,但进风气流经过导流板后,速度和方向发生变化,影响舍内气流和温度分布。为探究导流板对舍内环境影响趋势,通过计算流体力学(Computational fluid dynamics,CFD)分别探究了不同湿帘进风口布置的导流板对舍内及笼内气流和温度及分布影响,鸡舍环境模拟模型通过现场试验验证。结果表明:导流板可增加进风口附近区域的气流速度,降低笼内温度,且变化幅度随着进风位置与头架鸡笼间距离的增加而降低,研究中靠近进风口区域(自头架笼起27 m内鸡笼区域)平均气流速度可增幅0.54 m/s,可增大温度降幅0.2℃;距头架鸡笼27 m以外的笼内区域影响不显著。说明导流板可改善夏季纵向通风鸡舍内部分区域气流速度偏低问题,提高通风效率。

Adding insulation cover behind cooling pad is widely adopted in practice. It can prevent cold air from entering hen house directly in winter.It acts as flaps to alleviate the impact of temperature drop on laying hen production in summer. However, the velocity and direction of inlet airflow changes after passing through the flap, which affects the distribution and values of airflow and temperature in hen house. In this study, computational fluid dynamics(CFD)was used to investigate the effect of flaps on airflow and temperature in caged-hen occupied zone(CZ) under varied air supply locations. The simulation model was validated by field experiment. The results showed that flaps could increase airflow speed as well as decrease temperature in CZ near inlet, and variation trend decreased with the increased distance between inlet and the first cage. In this study, the maximum increase value of air speed in CZ near inlet(the zone within27 m from the first cage) was 0.54 m/s, of temperature was 0.2 ℃. Meanwhile, the impact of flaps on environment in CZ was limited. In this study, the influence zone was within 27 m from the first cage. The research illustrated that flap can effectively ameliorate problem of ventilation weak zone and improve cooling efficiency in summer.