Simulation of flow field and equipment structure optimization for tunnel airflow impact drying on fruit and vegetable
In order to solve the problem of non-uniformity of wind velocity flow field in tunnel-type air impingement drying equipment,the flow field of air impingement drying process was simulated and analyzed using computational fluid dynamics,and two improvement schemes were proposed,and nine groups of models were selected for each scheme.By comparing and analyzing the velocity uniformity and flow field distribution of each group of models,and by taking the velocity non-uniformity as the index,the structural parameters were obtained as the cylindrical spoiler with the height H=630 mm and the radius R=60 mm,and on this basis,the size of the airflow distribution port was adjusted,i.e.,the model with the upper and lower airflow distribution ports adjusted to 25 mm,and the middle airflow distribution port adjusted to 20 mm,is considered as the optimal structure.The velocity non-uniformity coefficient of the airflow distribution port of the optimal structure is reduced to 20.4％,and the velocity non-uniformity coefficient of the cross-section of the material layer is reduced to 16.89％,which greatly improves the uniformity of the airflow impact drying.The improved model was verified experimentally,and the relative errors between the simulated value and the experimental measured value are within 11％.The study can provide reference for the structural optimization of related drying equipment.
fruits and vegetablesairflow impact dryingflow field simulationstructural optimization
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