72 / 2025-04-15 18:26:05

Modelling different air distribution and environmental conditions of a pig house based on a scaled-down model

Pig houses, Scaled-down model, Computational fluid dynamics, Air distribution, Numerical simulation

2. 畜禽设施养殖工艺与装备系统 > （1）畜禽设施养殖模式创新与可持续性发展

Ventilation is crucial in livestock management. To investigate airflow characteristics under different ventilation configurations, a scaled-down prototype model, incorporating tunnel, sidewall, and roof ventilation, was constructed. This model enabled the analysis of flow field distribution and airflow uniformity across various setups, including different deflector and ceiling configurations. The results indicated that tunnel ventilation resulted in higher wind speeds compared to other ventilation methods. However, the wind speeds remained relatively low in the animal occupied zone (AOZ). Sidewall ventilation demonstrated good air delivery accuracy, but was associated with higher ventilation losses. Roof ventilation exhibited minimal air velocity at the front end of the house due to the presence of ducts, yet maintained similar air delivery accuracy. The introduction of suspended ceilings significantly increased wind speed within the house, but also exacerbated the uneven distribution of airflow. Although setting the deflector angle to 30° or 60° disrupted the symmetry of the airflow, it improved the overall uniformity of the flow field. The reduction of inlet area led to increased inlet wind speed, and a decrease in the pig house's sectional area resulted in higher outlet wind speed. Furthermore, changes in pressure within specific zones of the house also had an impact on wind speed. Although each ventilation pattern has its own set of advantages and limitations, the overall uniformity of airflow distribution within the house remains suboptimal. These findings are valuable for designing ventilation systems in growing and fattening pig houses and optimizing ventilation strategies.