热泵烘房结构及参数优化仿真设计

Optimal Simulation Design of Structure and Parameter in Heat Pump Drying Room

为解决热泵烘房干燥过程中存在的产品品质不稳定、干燥效率低等问题,借助计算流体动力学(CFD)仿真软件进行了基于烘房内气流分布的数值模拟,分析了速度分布均匀性问题,并通过改进烘房结构及速度参数开展模拟仿真与分析。结果表明:空载条件下,设置导流板倾斜角度为15°时,烘房内的气流分布效果较好;设置排风风速为6 m/s时气流均匀性效果较好,且对比得出排风速度对烘房内气流的影响最大;加载条件下,选择排风速度为6 m/s时可以较好地适应烘房干燥作业;排风速度为6 m/s、导流板倾斜角为15°组合下可以使气流分布更均匀。

The problems of unstable product quality and low drying efficiency of a heat pump drying room used in the drying process of chrysanthemum were investigated and tested.With the help of computational fluid dynamics(CFD)simulation software,the numerical simulation of airflow distribution in the drying room was carried out,and the uniformity of velocity distribution was analyzed.The results showed that under the condition of no load,the airflow distribution in the drying room was better when the tilt angle of the guide plate was set at 15°.The airflow uniformity was better when the exhaust wind speed was 6 m/s.The comparison showed that the exhaust velocity had the greatest influence on the airflow in the drying room.Under loading conditions,when the exhaust velocity was 6 m/s,it can better adapt to the drying operation in the drying room.When the exhaust velocity was 6 m/s and the inclination angle of the guide plate was 15°,the combined air distribution can be more uniform.The CFD method was used to simulate the flow field inside the drying room,which enabled to know the specific distribution of the flow field inside the drying room intuitively and clearly,which had great advantages for the study of the distribution uniformity of the flow field in the drying room.Based on the results of numerical simulation,structural optimization and drying room renovation were carried out to reduce the cost of research and realize scientific and efficient technical application.