鲜杏无水清洗喷嘴收口角度的仿真研究

为确定适用于鲜杏无水清洗喷嘴的最优收口角度,利用FLUENT软件分别对收口角度为1°,2°,…,30°的柱锥形喷嘴进行数值模拟分析,确定了相同的无水清洗喷嘴工作截面,并以鲜杏物料特性和喷嘴外流场特性作为喷嘴最优收口角度参考依据。结果表明:外流场气流速度随着收口角度的增大而增强;入口速度为80m/s,当收口角度超过30°时,无水清洗工作截面的气流速度超过鲜杏表皮所能承受最大速度;收口角度为15°时,工作截面平均气流速度可达32.35m/s、有效清洗宽度为70mm,且其速度不均匀系数最小。故本文鲜杏无水清洗喷嘴的最优收口角度为15°。本研究可为鲜杏无水清洗喷嘴的结构设计提供一种参考。

Numerical Simulation of Shell Nosing Angle of Waterless Washing Nozzle for Fresh Apricot

In order to identify the optimal shell nosing angle of waterless washing nozzle for fresh apricot , different shell nosing angle which included 1 °, 2 °,?, 30 °were studied by FLUENT software .The same working section of waterless washing was selected in the study .Material properties of fresh apricot and characteristics of external flow field of nozzle were considered as reference of the optimal nozzle .The results showed that the velocity of airflow increased with the in-crease of shell nosing angle .The inlet velocity of nozzle was set as 80 m/s.The high-speed airflow of working section had more than the maximum load of fresh apricot when the shell nosing angle was over 30 °.The nozzle ’ s average velocity of working section could up to 32.35 m/s when the shell nosing angle was 15°,and its effective width of working section was 70 mm.Besides it had the minimal velocity deviation coefficient of the nozzles .So the optimal shell nosing angle of waterless washing nozzle for fresh apricot was 15 °in this study , and the study could provide a reference for the structural design of waterless washing nozzle for fresh apricot .