数值模拟技术预测风机两种摆放方式对冷库堆垛货物的影响

Effects of two different fans arrangement on stacking cargo in cold store based on numerical simulation

为研究不同风机摆放方式对满载货物冷库气流分布以及堆垛货物温度分布的影响,以实际参观走访的中型冷库(24.3m×21.6m×7.2m)为蓝本,利用多孔介质模型并运用ergun方程对货物侧进行建模,分别建立风机下吹型和对吹型冷库模型,使用fluent软件对模型进行稳态模拟,对比分析两种风机摆放方式对该库及堆垛货物内部气流组织分布的影响。结果发现:下吹风冷库气流在货物区域温度和流速分布均匀,对吹风式冷库在货物区域温度分布并不均匀,气流风机射流末端货物区域存在大片高温区,因而可以得出:在所讨论的冷库中,风机下吹风摆放方式优于冷库风机对吹风摆放方式。

Two different cold store models,one with downward blowing fans and the other with back blowing fans,based on a medium practical cold storage were established to investigate the influence of different fans arrangement on airflow in the cold store（24.3m×21.6m×7.2m）.Steady-state simulation was performed by using fluent software and stacking cargos were considered as porous medium.Darcy-Forchheimer and ergun equations were used to describe the parameter of stacking cargo combined with former research.Essential analysis and comparison were also performed.The influence of different fans arrangement on stacking cargo and air flow in the cold store were investigated.A uniform velocity and temperature distribution was found in the cold store with down blowing fans.Inhomogeneous temperature distribution was found in the cold store with back blowing fans.The result of simulations showed that the uniformity of air distribution in the cold store with downward blowing fans performed better than the one with back blowing fans.High temperature region was found in the cargo area at the remote end of blowing fan.Therefore,at least in this case,conclusion can be made that downward blowing was better than that of back blowing,not only in predicted velocity and temperature value but also in the uniformity.