冷库空气幕性能数值模拟与参数优化

以一个实际冷库为试验对象,建立了包含冷库内部、冷库空气幕和库外环境在内的三维耦合数值模型,采用CFD数值模拟软件对冷库空气幕流场进行非稳态数值模拟,并对冷库温度场进行了试验测量,重点分析了冷库空气幕的送风速度、送风角度和喷口宽度等参数对冷库空气幕隔离性能的影响规律。结果表明,对于某个具体的冷库,存在最合理的送风速度和送风角度,使冷库空气幕的隔离性能达到最佳,库内温度场波动最小。冷库空气幕喷口宽度不宜选择过宽。本文研究的冷库空气幕最佳的送风速度为8 m/s,最佳的送风角度为向冷库外侧偏转15°,最佳的喷口宽度为0.04 m。

Numerical Simulation and Parameter Optimization on Performance of Air Curtain in Cold Stores

Taking a cold store as the experimental objective, the inside environment, air curtain and outside environment of the cold store were simulated by a 3D coupled model. The unsteady simulation of the flow field of the air curtain was performed by using a CFD software and the temperature field inside the cold store was measured. The effects of the supply velocity, supply angle and jet width of the air curtain on its isolation ability were analyzed under the condition that the door and the air curtain were opened simultaneously. The results show that there is an optimal supply velocity and angle to make the air curtain has its best isolation performance and the temperature field inside the cold store has the smallest fluctuation. However, the jet width should not be too large. The optimal supply velocity, angle and jet width of the air curtain for this cold store are 8m/s, 15° and 0.04m, respectively.