花生负压分级试验

Experimental study on negative pressure grading for peanut

基于拉瓦尔喷管结构设计一种结构简单、分级效果好、易操作的花生负压分级装置。通过Fluent对影响负压管内真空度的5个因素进行仿真试验,确定风道的结构尺寸;利用CFD-DEM耦合仿真软件,对体积相同密度相差较小的两类花生负压分选过程进行数值模拟,得出优质、次等花生的分选差异。在此基础上,通过搭建负压分选试验台,以分选高度、输送带速度以及风道进风速度为试验变量,对花生进行负压分级试验。试验证明基于拉瓦尔喷管结构的负压分选装置可以完成花生的负压分级作业。

A peanut negative pressure grading device with simple structure,good grading effect and easy operation was designed based on Laval nozzle structure.Five factors affecting the vacuum degree in negative pressure tube were simulated and the structure size of air duct was determined based on Fluent.CFD-DEM coupled simulation software was used to simulate the negative pressure sorting of two kinds of peanuts with the same volume and small density difference,and the sorting differences of high quality and inferior grade peanuts were obtained.On this basis,taking the sorting height,conveyor belt speed and air inlet speed as experimental variables,the negative pressure grading experiment of peanut was carried out by setting up a negative pressure grading test bench.The experiment proves that the negative pressure sorting device based on Laval nozzle structure can complete the negative pressure sorting operation of peanuts.