摘要
利用CFD方法,基于RSM雷诺应力模型和VOF多相流模型对旋流器内空气柱进行数值模拟,结果显示在t≈0.7 s,空气柱基本成型,且最终结果与PIV测试结果一致.旋流器内空气柱的空气是从沉砂口吸入并从溢流口排出.在沉砂管上端,空气柱发生大幅度的径向偏摆;空气柱进入溢流管后,产生"喉结"状突起.空气柱确实消耗了一部分不必要的能量,但并不对流场造成明显的额外扰动.给矿速度的变化对空气柱的直径几乎没有影响,而旋流器结构参数的变化,如沉砂口直径、溢流口直径、锥角等,对空气柱直径影响较大.
Numerical simulation of air core formation inside hydrocyclones was carried out by using a commercial computational fluid dynamics（CFD） modeling softw are package ANSYS / Fluent based on the Reynolds stress model（RSM） for the turbulence calculation and volume of fluid（VOF） model for capturing the air-liquid interface.The numerical simulation show n that the air core formed w hen the time w as 0.7 s,w hich w as in good agreement w ith the physical experiment conducted at a similar condition.The air of the air core entered the hydrocyclone from the underflow outlet and exhausted from the overflow outlet.The largest sw ing of the air core occurred in the region close to the underflow area,and a protuberance resembling the Adam＇ s apple appeared w hen the air core entered the overflow pipe.Unnecessary energy w as consumed,but no extra perturbation w as brought into the flow field by air core.Under current design and operation conditions,the structural parameters such as overflow and underflow outlet diameter and cone angle have more significant effects on the air core diameter than the operational parameter like the feeding rate.
出处
《东北大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2013年第9期1343-1346,1351,共5页
Journal of Northeastern University(Natural Science)
基金
国家自然科学基金资助项目(50974033
51104035)
中央高校基本科研业务费专项资金资助项目(N100301002)
关键词
水力旋流器
空气柱
数值模拟
PIV流场测试
影响因素
hydrocyclone
air core
numerical simulation
PIV flow field measurements
influencing factor
