干燥是粮食储存的重要手段，优化干燥工艺可使干燥过程更科学节能。建立了小麦干燥过程中湿热传递的数学模型，基于FLUENT的UDF(用户定义函数)功能编写了相应的自定义程序，对小型立式混流烘干机中小麦的干燥过程进行了模拟计算和试验验证。结果表明，小麦区域平均湿度和平均温度的模拟结果与试验结果基本一致；小麦湿度随干燥风速度的升高而降低，且干燥风在速度8～10 m/s时小麦干燥品质佳、能耗少。证明了该模型和计算程序的有效性。

Drying is an important means of grain storage,so optimizing the drying process can make the drying process more scientific and energy-saving.The mathematical model of moisture and heat transfer in the process of wheat drying was established in this paper. Based on the UDF function of fluent,the corresponding self-defined program was compiled to simulate and verify the drying process of wheat in the small vertical mixed flow dryer.The results showed that the calculated results of the average humidity of wheat and the average temperature of wheat region were basically consistent with the experimental results;the humidity of wheat decreased with the increase of the drying wind speed,and the drying quality of wheat was better and the energy consumption was less when the drying wind speed was 8—10 m/s.It was proved that the model and calculation program in this paper were effective.