| 进风位置对纵向通风叠层鸡舍气流和温度影响CFD模拟 |
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| 引用本文： | 程琼仪,穆钰,李保明.进风位置对纵向通风叠层鸡舍气流和温度影响CFD模拟[J].农业工程学报,2019,35(15):192-199. |
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| 作者姓名： | 程琼仪 穆钰 李保明 |
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| 作者单位： | 1. 农业农村部规划设计研究院农村能源与环保研究所，北京100125;,2. 农业农村部规划设计研究院设施农业研究所，北京100125;,3. 中国农业大学水利与土木工程学院，北京100083; 4. 农业农村部设施农业工程重点实验室，北京100083; |
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| 基金项目： | 国家重点研发计划（2018YFD0500700）；国家蛋鸡产业技术体系 （CARS-40）。 |
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| 摘 要： | 为提高鸡舍夏季通风效率,改善舍内环境条件,该文通过计算流体力学(computational fluid dynamics, CFD)模拟分别探究了进风口内侧加设导流板及不加设导流板时,进风位置对叠层笼养鸡舍舍内及笼内气流、温度及分布的影响。鸡舍模型通过现场试验进行验证。结果表明:在进风口内侧不加设导流板时,近进风口区域(距首个笼17.5 m之内鸡笼区域)笼内平均风速随着进风位置与鸡笼间距离增加而增大,最大增幅为0.54m/s。而当进风口内侧加设导流板时,不同进风位置时对笼内平均风速相对差异小于10%。同时,随着进风位置与鸡笼间距离增加,近进风口处笼内气流分布均匀性增加,笼内温度呈降低趋势且其分布趋于均匀。但进风位置对笼内环境影响范围有限,文中研究显示,进风位置对气流速度的影响范围为距首个笼27 m之内笼内区域,对气流分布均匀性的影响范围为距首个笼45 m之内笼内区域,对温度分布的影响范围为距首个笼18 m之内笼内区域。研究表明,在叠层鸡舍夏季通风系统进风位置设计中,应尽量设计在山墙,及保证进风口与鸡笼区域无重合,使得进风气流充分发展后进入鸡笼,有助于减少笼内通风弱区及涡流区域。
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| 关 键 词： | 气流场 温度 计算流体力学 鸡舍 进风位置 |
| 收稿时间： | 2018/11/28 0:00:00 |
| 修稿时间： | 2019/5/13 0:00:00 |
CFD simulation of influence of air supply location on airflow and temperature in stacked-cage hen house with tunnel ventilation |
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| Cheng Qiongyi,Mu Yu and Li Baoming.CFD simulation of influence of air supply location on airflow and temperature in stacked-cage hen house with tunnel ventilation[J].Transactions of the Chinese Society of Agricultural Engineering,2019,35(15):192-199. |
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| Authors: | Cheng Qiongyi Mu Yu and Li Baoming |
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| Institution: | 1. Institute of Energy and Environmental Protection, Chinese Academy of Agricultural Engineering, Beijing 100125, China;,2. Institute of Facility Agriculture, Chinese Academy of Agricultural Engineering, Beijing 100125, China; and 3. College of Water Resources and Civil Engineering, China Agricultural University, Beijing 100083, China; 4. Key Laboratory of Agricultural Engineering in Structure and Environment, Ministry of Agriculture and Rural Affairs, Beijing 100083, China; |
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| Abstract: | The environment in hen house is critical to the production performance of laying hens. Tunnel ventilation which combines cooling pad and exhausted fans is commonly adopted in hen house in summer. The air motion is driven by exhaust fans on the gable wall. After cooled down by the wet pad, the air takes away the heat produced by hens, and then goes out through the exhaust fans. In this study, the effects of the air supply location were studied to identify its influence on the airflow, temperature and its distribution based on computational fluid dynamics (CFD) simulations. The hen house measured in this study was a breeding house with five columns fours stacked layer cages. The length of the hen house was 105 m and the width was 15 m, the height of the gable wall was 6 m and of the roof was 7 m, the distance between the gable wall and first cage was 7.5 m. The number of hens was 28 717. The air supply locations investigated in this study were differed by the inlet area in the side and gable wall, the distance between sidewall inlet and gable wall inlet, the distance between the inlet and first hen cage. The simulation model was validated by field experiment, in which speed and temperature in the breeding hen house in 18 points in the aisles were measured. The relative difference between measured and simulated results of temperature was 0.1%, and of speed was 9.5%, illustrating that the model was reasonable to simulate the environment in the hen house. The simulation results showed that without flaps behind the inlet, the increase of the distance between the air supply location and the cage could significantly increase the average wind speed inside the caged-hen occupied zone (CZ) near the air inlet zone (within 17.5 m from the first cage). The maximum increase amplitude was 0.54 m/s in this study. With flaps behind the air inlet, the air supply location had no significant effect on the average speed in CZ in the cage. Meanwhile, with the increased distance between the air supply location and the cage, the uniformity of airflow distribution in CZ nearby the inlet increased, the temperature in CZ decreased and its distribution tended to be more uniformity. However, the influence range of the air supply location on the environment in CZ was limited. In this study, the influence range in CZ of the air supply location on air speed was within 27 m from the first cage, on airflow distribution uniformity was within 45 m from the first cage, on temperature distribution was within 18 m from the first cage. This study showed that in the design of air supply location in hen house in summer, the gable wall should be utilized as much as possible. The overlap between the inlet and the hen cage should also be avoided, to guarantee that the inlet airflow could be fully developed before entering the CZ. This design was beneficial to reduce the weakly ventilated zone and vortex in CZ, and can guide the design of air supply location in hen houses. |
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| Keywords: | airflow field temperature computational fluid dynamics (CFD) breeding hen house air supply location |
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