风速对冷藏集装箱果蔬水分耗散影响的模拟研究

The Simulation Study of Influence of Air Supply Velocity on Fruit and Vegetable Moisture Dissipation in Mechanical Refrigeration Container

研究送风速度对冷藏集装箱内果蔬水分耗散的影响规律,对提高果蔬冷藏运输质量有重要的参考意义。以机械式冷藏集装箱和番茄为研究对象,借助FLUENT软件多孔介质模型和组分输运模型,建立冷藏集装箱内部果蔬散湿的数学模型,采用非稳态计算方法,模拟研究了不同送风速度下冷藏集装箱内果蔬水分耗散的分布规律。研究表明:稳定状态时冷藏集装箱番茄堆内部水分耗散速率的分布呈现明显分层现象,通过提高送风速度能够降低冷藏集装箱内果蔬水分的耗散量;送风速度增大到一定程度时,对果蔬水分耗散影响作用明显减弱;本次试验模型降低果蔬冷藏运输水分耗散的最优送风速度工况为8m/s。

The study of influence of air supply velocity on fruit and vegetable moisture dissipation in mechanical refrigeration container,which improved the quality of fruits and vegetables refrigerated transport,had important reference meaning to the research of mechanical refrigeration container.Taking the traditional mechanical refrigeration container and tomato as the research object,the mathematic model of the fruit and vegetable moisture dissipation in the refrigeration container was established by using the porous media model and the component transport model in FLUENT software.The non-steady state calculation method was used to simulate the distribution of moisture dissipation of fruit and vegetable in the refrigeration container under different air supply velocity.It was found that the distribution of moisture dissipation rate inside the tomato pile was stratified obviously in the steady state.By improving the air supply velocity could reduce the amount of fruit and vegetable moisture dissipation in the refrigeration container.When air supply velocity increased to a certain extent,the influence of the fruit and vegetable moisture dissipation decreased significantly.In this test model,the optimal air supply velocity was 8 m/s reducing fruit and vegetable moisture dissipation.