【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°。更多还原

【Abstract】 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.更多还原