SIMULATION OPTIMIZATION AND EXPERIMENTAL STUDY OF THE AIR DISTRIBUTION CHAMBER STRUCTURE OF STRAW-BASED NUTRIENT SEEDING-GROWING BOWL TRAY MICROWAVE–HOT-AIR COUPLING DRYERS

• Autor(a) principal: Li,Haiyuan
• Data de Publicação: 2022
• Outros Autores: Hu,Yuhui, Qi,Lianxing, Yu,Haiming
• Tipo de documento: Artigo
• Idioma: eng
• Título da fonte: Engenharia Agrícola
• Texto Completo: http://old.scielo.br/scielo.php?script=sci_arttext&pid=S0100-69162022000200202
• topic: air distribution chamber structure; CFD model; simulation optimization

ABSTRACT To improve the flow field structure of the air distribution chamber of the microwave–hot-air coupling dryer for a straw-based nutrient seeding-growing bowl tray and enhance the uniformity of the outlet gas velocity distribution, computational fluid dynamics software was used to simulate the flow field of the air distribution chamber based on the gas motion differential equation and the (RNG) k–ε turbulence model. Using the front panel height, upper apex angle, and side wall inclination angle as factors and the speed nonuniformity coefficient as the index, the results showed that when the air distribution chamber front panel height was 33 mm, the upper apex angle was 108°, the side wall inclination angle was 78°, the height of the two spoilers was 40 mm, the outlet airflow speed varied from 5.36 to 5.71 m/s, and the speed unevenness coefficient was reduced from 13.95% in the original model to 6.05%. The maximum deviation between the numerical simulation results and test data was less than 4%, which met the uniformity requirement of the outlet airflow speed of the dryer. The results provide theoretical support for the design and industrial production of microwave–hot-air coupling dryers.