摘要
本文着重研究了气举用振荡脉冲射流破碎器在淹没条件下的动态特性、冲蚀特性和现场试验情况。实验表明在淹没条件下振荡脉冲射流不仅具有强烈的动态脉动冲击特性 ,而且具有波动的径向流动 (附壁流动 )。在相同条件下振荡压力能破碎连续射流所不能破坏的土岩 ,而且能产生波动上举力 ;波动的径向流动使作用在破碎的土岩颗粒上的升力增大 ,使作用在土岩颗粒上的上举力大于压持力 ,导致土岩颗粒易于流动。在气举上使用脉冲射流喷嘴 ,其轴吸浓度稳定 。
It is essential that the hard clay should be broken and the ore deposit under water should be loose for exploiting beach placer with sand pump or airlift.The feasibility of the nozzle of self-excited oscillation pulsed jet(SEOPJet) as the breaker and loosing device for the airlift is studied.The dynamic characteristics of the SEOPJet to crush the hard clay and loose the layer of ore deposit are explored experimentally under the submerged condition.It is shown that the SEOPJet not only effectively breaks the hard clay or looses the particles of sand on the placer bed,but also produces fluctuating uplift forces acting on particles of sand.The oscillating cross flow caused by the SEOPJet makes particles of sand move to the end of the suction pipe quickly.Velocities of the airlift to penetrate the hard clay and concentration of the solids in the solid-liquid mixture sucked by the airlift are increased obviously.
出处
《振动与冲击》
EI
CSCD
北大核心
2002年第3期15-17,共3页
Journal of Vibration and Shock
基金
国家自然科学基金资助项目 (598740 33)
湖南科技厅"工业攻关计划"项目 ([2 0 0 0 ] 87)
