Analysis and Optimization of the Airflow Field in a Head-air Heat Pump Dryer Based on Fluent
As the main energy-saving drying equipment for fruit and vegetable products at present,the uniformity of the internal flow field is very important to the efficiency and quality of drying.In this paper,the internal flow field of top-wind heat pump drying oven was optimized using the research method of Fluent dynamic grid numerical simulation optimization and experimental verification,which improved the inter-layer uniformity and drying efficiency of the flow field.Based on the structural characteristics of the headwind drying box,a controllable moving air deflector mechanism was innovatively designed,and 3 schemes including uniform motion,segmented uniform motion and uniform+stagnation compound motion were compared.The simulation results showed that the uniform+stagnation compound motion scheme had the best interlayer uniformity of flow field.After optimization,the uneven coefficient of air volume distribution between layers was as low as 7.02%,and the effectiveness of the optimization scheme was verified by the experiment of green plum drying.The standard deviation of water content of each layer after optimization was 0.01.The system provided reference for the flow field design and structure optimization of the top-wind heat pump drying oven.
top-air drying ovensfluentdynamic gridstructural optimizationflow field uniformity
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