摘要
为研究北方寒冷地区管道垂直通风保育猪舍内环境分布规律,以黑龙江省齐齐哈尔市保育猪舍为研究对象,通过计算流体力学(Computational fluid dynamics,CFD)模拟不加挡风板与不同角度挡风板下温度场、风速场和平均空气龄分布情况。设计5种方案,方案1无挡风板,方案2圆柱形挡风板,方案3~5挡风板角度(α)为60°、45°、30°圆台形挡风板。保育猪舍管道垂直通风模型经现场试验验证,结果表明管道垂直通风CFD模型温度场和风速场与实际测量值差异不显著(决定系数R2分别达到0.9268和0.8926),表明模型仿真精度高;增加挡风板猪舍动物占用区域(Animal occupied zone,AOZ)温度场中温差降低50.77%~71.39%,温度标准差降低28.77%~62.32%,风速场中气流变异系数降低28.60%~61.37%,平均空气龄(Mean age of air,MAA)标准差降低14.83%~43.40%。不同角度挡板产生不同气流,影响温度场、风速场和平均空气龄分布。研究可为北方寒冷地区保育猪舍管道垂直通风结构优化设计和环境调控提供理论依据。
In order to study the environmental distribution law of the vertical ventilation nursery pig house in cold northern regions, the nursery pig house in Qiqihar City, Heilongjiang Province was used as the research object. Computational fluid dynamics(CFD) simulations were used to explore the temperature field and wind velocity field distribution under the conditions of no wind deflector and wind deflectors with different angles. Five cases were designed and analyzed, case 1 had no wind deflector,case 2 had cylindrical wind deflector, and case 3 to 5 were truncated cone-shaped wind deflectors with an angle of 60°, 45° and 30° between the bus bar and the bottom surface, respectively. The vertical ventilation model of nursery pig house was verified by experiment. The results showed that the coefficient of determination(R2) between the temperature field and airflow field of the vertical ventilation nursery pig house CFD model and the actual measured value reached 0.9268 and 0.0.8926,respectively, which indicated that the model had a high degree of simulation;when the wind deflector was added, the temperature difference in the animal occupied zone(AOZ) of the pig house would be reduced by 50.77%-71.39%, the temperature standard deviation would be reduced by 28.77%-62.32%,the coefficient of variation of airflow would be reduced by 28.60%-61.37%, and the standard deviation of mean age of air(MAA) would be reduced by 14.83%-43.40%. Baffles with different angles produced different airflow, which affected the distribution of temperature field, wind velocity field and mean age of air. This study could provide a theoretical basis for the optimal design and environmental regulation of the vertical ventilation structure of the nursery pig house in the cold northern regions.
作者
房俊龙
吴爽
吴志东
巴文革
FANG Junlong;WU Shuang;WU Zhidong;BA Wenge(School of Electrical and Information,Northeast Agricultural University,Harbin 150030,China;School of Mechanical and Electronic Engineering,Qiqihar University,Qiqihar Heilongjiang 161006,China)
出处
《东北农业大学学报》
CAS
CSCD
北大核心
2022年第5期59-68,共10页
Journal of Northeast Agricultural University
基金
国家自然科学基金面上项目(32072787)。
关键词
CFD
垂直通风
通风优化
风速场
温度场
CFD
vertical ventilation
ventilation optimization
velocity field
temperature field
