机械科学与技术2018，Vol.37Issue(2)：250-257,8.DOI:10.13433/j.cnki.1003-8728.2018.0214
水射流喷嘴增强气力提升性能的实验研究
Experimental Study on Airlift Performance Reinforced by Water Jet Nozzle
摘要
Abstract
In the process of borehole hydraulic jet mining,the effect of chip hold-down produced at the bottom of the well on debris easily leads to poor transport capacity of an airlift system.To solve this problem,a new particle feeding method similar to the real situation was proposed,and the water jet nozzles were introduced to investigate the airlift performance and its critical points.The results are found as follows:The chip hold-down could be eliminated in the case of N=3,in turn,this makes the mass flow rate of solids and lifting efficiency increase greatly and then have a slight variations with increasing N;The appropriate inhomogeneity of spatial distribution of the water jet nozzles are also given to promote the airlift performance.Moreover,the mass flow rate of solids and lifting efficiency are especially improved by using water jet nozzles in the case of H＜0.The research results of critical points show that the water jet nozzles have little effect on the critical air flow rate QG,L for conveying water.However,the critical air flow rate QG,S and the critical volumetric flux JL,cri corresponding to lifting river sand are significantly decreased due to the disappearance of chip hold-down and then have a slight decrease with the increase of N.The JL,cri is very close to the computational value of theoretical model uLcri when H=0.But as H rises,their differences increase gradually.关键词
水射流喷嘴/气力提升/颗粒质量流量/效率/临界情况/实验研究Key words
water jet nozzle/airlift/mass flow rate of solids/efficiency/critical condition/experimental study分类
能源科技引用本文复制引用
胡东,唐川林,张凤华..水射流喷嘴增强气力提升性能的实验研究[J].机械科学与技术,2018,37(2):250-257,8.基金项目
国家自然科学基金项目(51374101)与湖南省教育厅科研项目(16C0464)资助 （51374101）
