新型落球阀颗粒流动实验及DEM模拟研究  

Experimental Study and DEM Simulation of Granular Flow through a New Sphere Discharge Valve

作　　者：张鹤[1] 李天津[1] 黄志勇[1] 高志[1] 齐炜炜[1] 薄涵亮[1] 

机构地区：[1]清华大学核能与新能源技术研究院,北京100084

出　　处：《核动力工程》2015年第3期99-102,共4页Nuclear Power Engineering

基　　金：国家科技重大专项经费资助项目(ZX06901)

摘　　要：采用玻璃球对基于休止角原理的新型落球阀颗粒流动进行实验和离散单元法(DEM)模拟研究。实验结果表明,颗粒下落平均质量流量与落球阀开度表现出空行程、线性变化和孔口限流3段规律;Beverloo定律可用于多孔口颗粒流孔口限流段计算;颗粒平均质量流量随落球阀开度变化可由基于开度修正的Beverloo定律描述。DEM模拟结果表明,不同落球阀开度下,贮球罐内颗粒出流休止角均为23°。Experiments and DEM simulation have been conducted to investigate the granular flow through a new type of sphere discharge valve. The new sphere discharge valve was based on the principle of angle of repose. The glass sphere was used in the granular discharge experiments. Experimental results showed that the relation between the averaging sphere discharge mass flow rate and the stroke of the sphere discharge valve were consisted of three zones, i.e. the idle stroke zone, linearly zone and orifice restriction zone. The Beverloo＇s law was suitable for the granular flow through multi-orifices in the orifice restriction zone. The variation of averaging sphere discharge mass flow rate with the stroke of the sphere discharge valve was described by Beverloo＇s law with the modification based on the stroke of the sphere discharge valve. DEM simulation results showed that the drained angle of repose during granular flow in the sphere storage vessel remained 23 degrees with different stroke of the sphere discharge valve.

关 键 词：颗粒流 休止角 离散单元法模拟 落球阀 孔口 高温气冷堆 

分 类 号：TL351[核科学技术—核技术及应用]