集沙仪内二次流对沙尘收集范围的影响分析  

Analysis of influence of secondary flow in sand sampler on the collecting range of sand

作　　者：宋涛[1] 谢学虎 张良 刘洪豪 倪玉权 Song Tao;Xie Xuehu;Zhang Liang;Liu Honghao;Ni Yuquan(College of Mechanical Engineering,Taishan University,Tai'an,271000,China)

机构地区：[1]泰山学院机械工程学院,山东泰安271000

出　　处：《中国农机化学报》2024年第5期253-257,共5页Journal of Chinese Agricultural Mechanization

基　　金：山东省自然科学基金资助项目(ZR2021QE217);山东省科技型中小企业创新能力提升工程项目(2023TSGC0678);泰安市科技发展计划项目(2021NS087)。

摘　　要：二次流动是工程实际中普遍存在的物理现象,是一种相对于主流的次要流动。为研究集沙仪内二次流对气流速度、不同粒径的沙尘粒子的影响规律,利用数值模拟和试验验证相结合的方法,以分流对冲与多级扩容式集沙仪的风沙分离器为研究对象,对二次流被削弱前后的流场特性进行分析。研究结果表明:在二次流被削弱前,粒径大于0.083 mm的沙尘被完全收集,粒径小于0.083 mm的沙尘被大部分收集;在二次流被削弱后,高速气流分布范围更大,流场似乎变得不稳定,排气管内气流速度明显增高,粒径大于0.12 mm的沙尘才被完全收集,沙尘被完全收集的范围明显缩小。Secondary flow is a common physical phenomenon in engineering practice,which is a secondary flow relative to the mainstream.In order to study the influence of secondary flow on airflow velocity and different particle sizes of sand particles in a sand sampler,this paper uses a combination of numerical simulation and experimental verification to analyze the flow field characteristics before and after secondary flow is weakened,taking the wind-sand separator of the shunt-hedging and multi-stage expansion sand sampler as the research object.The research results indicate that before secondary flow is weakened,sand with a particle size greater than 0.083 mm are completely collected,while sand with a particle size less than 0.083 mm are mostly collected.After secondary flow is weakened,the distribution range of high-speed airflow becomes larger,and the flow field seems to become unstable.The airflow velocity inside the exhaust pipe significantly increases,and only sand with a particle size greater than 0.12 mm are completely collected,and the range of sand being completely collected is significantly reduced.

关 键 词：集沙仪 二次流 数值模拟 风沙分离器 

分 类 号：S15[农业科学—土壤学] P414.7[农业科学—农业基础科学]