农业机械学报2017，Vol.48Issue(3)：113-118,6.DOI:10.6041/j.issn.1000-1298.2017.03.014
分流对冲与多级扩容组合式集沙仪内风沙分离规律研究
Wind-Sand Separation Rules in Shunt-hedging and Multi-stage Expansion Combined Sand Sampler
摘要
Abstract
When wind speed,soil particle size distribution,collection time and inlet collection efficiency etc.are certain,separation efficiency of sand sampler is the main factor affecting collection efficiency,which is often affected by wind-sand separation rules.In order to reveal wind-sand separation rules in the sand sampler,a sand separator in the shunt-hedging and multi-stage expansion combined sand sampler was took as a study model,a analysis of single-phase flow field and gas-solid two-phase flow field in the sand separator was made through Fluent numerical simulation and micro wind-tunnel test.On the base of explaining reducing velocity mechanism of airflow,a further analysis of airflow reducing velocity and sand volume fraction effect on wind-sand separation was done,and the influencing situation of different particle size of sand was expounded.The results showed that reducing velocity substantially was the most effective method that achieving wind-sand separation,the main reason caused by substantial airflow speed reduction was the formation of a large value of turbulent kinetic energy field;for wind-sand flow,when the sand content was high,the wind-sand separation effect was going to be good with good velocity reducing effect,when sand was affected by strong winds,sand with particle size less than 0.032 41 mm was easily induced by flow field,less affected by the motion of inertial,the possibility excreted from the exhaust port was large,which was the main part that affected sand separation efficiency and sand collection efficiency.The study provided a theoretical reference for the design of sand sampler,which had a good collection performance,and it further improved the theoretical system of sand sampler technology.关键词
集沙仪/集沙效率/数值模拟/流场Key words
sand sampler/sand collection efficiency/numerical simulation/flow field分类
农业科技引用本文复制引用
宋涛,商晓彬,仇义,陈智,边炳传,刘海洋..分流对冲与多级扩容组合式集沙仪内风沙分离规律研究[J].农业机械学报,2017,48(3):113-118,6.基金项目
国家自然科学基金项目(41361058、41161045) （41361058、41161045）
