摘要
基于气固两相流理论及扁平型硐室采场特点,建立粉尘运移模型,运用FLUENT软件中的k-ε双方程模型和离散相模型(DPM)对采场爆破后通风20min内粉尘浓度变化,以及在不同入口风速下粉尘的运动轨迹进行了数值模拟。结果显示粉尘浓度分布受风流流场影响显著,爆破0～50s时间内粉尘受回流作用聚集在硐室左侧隅角及边壁附近,50s之后粉尘开始由主风流带出硐室,60s后开始进入循环净排阶段,在0～70s内粉尘浓度下降最快,70s以后采场内的粉尘主要是呼吸性粉尘,沉降时间较长。对粉尘运移的数值模拟显示,不同入口风速对粉尘的运移影响明显。
Basing on the theory of gas-solid two-phase flow and the characteristics of flat-type chamber stope,the model of dust migration was established.k-ε two-equation model and DPM（Discrete Phase Model） of fluent software was used to perform the numerical simulation no the dust concentration transformation in ventilation of 20 minutes after blasting and the movement locus of dust under different inlet wind speeds.The results showed that the flow field of airflow has a significant effect to the distribution of dust concentration.The dust gathers on the left corner of chamber and in the vicinity of chamber＇s side wall in 0-50 s after blasting,then,is carried away from the chamber by the main stream 50 s after blasting,and comes to the stage of the circular net emission after 60 s.The concentration of dust falls most quickly in 0-70 s,after 70 s it is mainly respirable dust,needing a long time to settle.The numerical simulation of dust migration showed that the different inlet velocities have a significant effect to the dust migration.
出处
《矿业研究与开发》
CAS
北大核心
2010年第5期77-80,共4页
Mining Research and Development
基金
国家自然科学基金项目(50574050)
建设部科技项目(04-2-015
06-k1-16).
关键词
扁平硐室采场
粉尘浓度
粉尘运移
气固两相流
数值模拟
Flat-type cavern stope
Dust concentration
Dust migration
Gas-solid two-phase flow
Numerical simulation
