小型冷库开关门过程温度场的数值模拟

Numerical simulation on temperature field in the doorway of a minitype cold store

近年来,计算流体力学(CFD)技术随着计算机科学和流体力学理论的发展而在工业各领域得到广泛使用。用CFD技术对冷库开关门过程进行了非稳态数值模拟,分析了小型冷库开关门过程中门周边温度场的变化,讨论了外界环境对冷库影响的区域,研究模拟了开关门各20 s过程的温度场变化情况,发现由冷热空气密度差引起的自然流动是门处空气流动的主要方式。研究表明关门后,冷库下部的空气温度场恢复较快,上部恢复较慢(10 s以后才明显下降),20 s后温度可大致恢复至开始状态。研究结果证明数值模拟能较好地反映现实情况。

Recently, computational fluid dynamics （CFD） has been used extensively in many fields of industry along with the development of the computer science and fluid mechanics theory. In this paper, the unsteady numerical simulation in the doorway was done by CFD, the temperature field in the doorway of a minitype cold store was analyzed. The space of the influence on the cold store by the environment was also discussed. The unstesdy temperature field in two 20s＇ periods of opening and closing door was simulated, it＇ s found that the natural flow caused by the density differences is the major flow of the air around the door. It was also found that the temperature field in the downside recovered quickly, but that in the upside was not as fast as it. It needs 20 seconds to get back the initial condition. The result shows that the simulation can reflect the reality well.